{"id":5117,"date":"2025-11-20T09:30:00","date_gmt":"2025-11-20T08:30:00","guid":{"rendered":"https:\/\/tps-elektronik.com\/?p=5117"},"modified":"2025-11-24T10:09:02","modified_gmt":"2025-11-24T09:09:02","slug":"inrush-current-limiter-for-small-pv-inverters-3-phase-400vac-input-surge-protection-high-reliability-applications","status":"publish","type":"post","link":"https:\/\/tps-elektronik.com\/en\/inrush-current-limiter-for-small-pv-inverters-3-phase-400vac-input-surge-protection-high-reliability-applications\/","title":{"rendered":"Inrush Current Limiter for Small PV Inverters: 3-Phase 400 VAC Input Surge Protection &#038; High-Reliability Applications"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n<ul>\n<li>The <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/protector-inrush-current-limiter-145\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">TPS-ICL-3P<\/a> series from <a href=\"https:\/\/tps-elektronik.com\/\">TPS elektronik<\/a>, a specialized 3 phase <a href=\"https:\/\/en.wikipedia.org\/wiki\/Inrush_current_limiter\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">inrush current limiter<\/a> (ICL), offers a robust solution with a 25A rated current, IP20 protection, and a wide operating temperature range of -40\u2103 to 70\u2103.<\/li>\n<li data-start=\"1047\" data-end=\"1283\">\n<p data-start=\"1049\" data-end=\"1283\">By implementing a \u201cfront-end current limiting + back-end protection\u201d two-stage scheme with the TPS-ICL-3P series, system designers can effectively mitigate inrush current and improve inverter stability and grid-connection behaviour.<\/p>\n<\/li>\n<li data-start=\"1284\" data-end=\"1457\">\n<p data-start=\"1286\" data-end=\"1457\">With its compact housing, low profile and narrow width, the TPS-ICL-3P series is well suited for limited-space applications in outdoor PV power station control cabinets.<\/p>\n<\/li>\n<li data-start=\"1458\" data-end=\"1644\">\n<p data-start=\"1460\" data-end=\"1644\">The series supports high-density installation and crowded panels by combining industrial-grade reliability with a miniature footprint for both industrial and commercial applications.<\/p>\n<\/li>\n<li data-start=\"1645\" data-end=\"1825\">\n<p data-start=\"1647\" data-end=\"1825\">Understanding what inrush current is and how an inrush current limiter works is essential for optimizing PV inverter performance and service life in harsh outdoor environments.<\/p>\n<\/li>\n<\/ul>\n<p><!-- \/wp:post-content --><\/p>\n<p><!-- \/wp:list --><\/p>\n<p><!-- wp:paragraph --><\/p>\n<p data-start=\"1832\" data-end=\"2155\">The global shift toward renewable energy is driving rapid growth in photovoltaic (PV) systems. Small-scale 10\u201330 kW inverters have become the workhorses of residential, commercial and small industrial installations. These inverters convert DC power from solar modules into AC power compatible with the 3-phase 400 VAC grid.<\/p>\n<p data-start=\"2157\" data-end=\"2277\">However, a persistent challenge affects their reliable operation: <strong data-start=\"2223\" data-end=\"2241\">inrush current<\/strong> during startup and grid connection.<\/p>\n<p data-start=\"2157\" data-end=\"2277\">\u00a0<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5300\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2025\/11\/Lamp_inrush_current.jpg\" alt=\"The inrush current of an incandescent lamp causes a bench power supply to limit its output current.\" width=\"800\" height=\"480\" \/><\/p>\n<h2 data-start=\"2284\" data-end=\"2336\">What Is Inrush Current \u2013 and Why Is It a Problem?<\/h2>\n<p data-start=\"2338\" data-end=\"2611\">Inrush current (also called inrush surge current) is the brief, but very high, current that flows when an electrical device is switched on or connected to a power source. In PV inverters, this effect is mainly caused by the charging of large input capacitors on the DC bus.<\/p>\n<p data-start=\"2613\" data-end=\"3070\">These capacitors stabilize the DC bus voltage. When the inverter connects to the grid or powers on, the capacitors are initially discharged and behave almost like a short circuit. As they charge to their rated voltage, a surge of current flows until they reach steady state. For 10\u201330 kW inverters, this inrush current can reach 10\u201320 times the rated operating current (for example 250\u2013500 A for a 25 A inverter), typically for microseconds to milliseconds.<\/p>\n<h3 data-start=\"3072\" data-end=\"3112\">AC Inrush Current in 3-Phase Systems<\/h3>\n<p data-start=\"3114\" data-end=\"3396\">In 3-phase 400 VAC systems, inrush current behaviour is more complex than in single-phase applications. Ideally, current is balanced across all three phases. In practice, phase imbalances, voltage transients or asymmetric capacitor charging can lead to unbalanced inrush currents.<\/p>\n<p data-start=\"3398\" data-end=\"3423\">The consequences include:<\/p>\n<ul data-start=\"3425\" data-end=\"3614\">\n<li data-start=\"3425\" data-end=\"3473\">\n<p data-start=\"3427\" data-end=\"3473\">Disproportionate stress on individual phases<\/p>\n<\/li>\n<li data-start=\"3474\" data-end=\"3513\">\n<p data-start=\"3476\" data-end=\"3513\">Increased risk of component failure<\/p>\n<\/li>\n<li data-start=\"3514\" data-end=\"3554\">\n<p data-start=\"3516\" data-end=\"3554\">False tripping of protective devices<\/p>\n<\/li>\n<li data-start=\"3555\" data-end=\"3614\">\n<p data-start=\"3557\" data-end=\"3614\">Disrupted inverter operation and grid-connection issues<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"3616\" data-end=\"3660\">Consequences of Unmanaged Inrush Current<\/h3>\n<p data-start=\"3662\" data-end=\"3723\">If inrush current is not controlled, typical effects include:<\/p>\n<ul data-start=\"3725\" data-end=\"4525\">\n<li data-start=\"3725\" data-end=\"3931\">\n<p data-start=\"3727\" data-end=\"3931\"><strong data-start=\"3727\" data-end=\"3748\">Frequent restarts<\/strong><br data-start=\"3748\" data-end=\"3751\" \/>Inverters use overcurrent protection (OCP) to shut down under excessive current. Inrush spikes can trigger this protection, causing repeated restarts and reducing energy yield.<\/p>\n<\/li>\n<li data-start=\"3933\" data-end=\"4124\">\n<p data-start=\"3935\" data-end=\"4124\"><strong data-start=\"3935\" data-end=\"3965\">Accelerated component wear<\/strong><br data-start=\"3965\" data-end=\"3968\" \/>Repeated inrush events stress capacitors, relays and semiconductor devices (e.g. IGBTs), shortening their service life and increasing maintenance costs.<\/p>\n<\/li>\n<li data-start=\"4126\" data-end=\"4341\">\n<p data-start=\"4128\" data-end=\"4341\"><strong data-start=\"4128\" data-end=\"4156\">Grid compliance problems<\/strong><br data-start=\"4156\" data-end=\"4159\" \/>High inrush currents can cause voltage dips or harmonics on the grid. This may conflict with interconnection standards and lead to restrictions or complaints from grid operators.<\/p>\n<\/li>\n<li data-start=\"4343\" data-end=\"4525\">\n<p data-start=\"4345\" data-end=\"4525\"><strong data-start=\"4345\" data-end=\"4361\">Safety risks<\/strong><br data-start=\"4361\" data-end=\"4364\" \/>Extreme current spikes can generate local overheating, potentially leading to insulation damage or, in rare cases, fire hazards in confined control cabinets.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"4532\" data-end=\"4593\">The Role of Inrush Current Limiters (ICLs) in PV Inverters<\/h2>\n<p data-start=\"4595\" data-end=\"4975\">An <strong data-start=\"4598\" data-end=\"4630\">inrush current limiter (ICL)<\/strong> \u2013 also referred to as a starting current limiter \u2013 is a device that limits transient inrush currents during startup so the system can reach steady state safely. For 3-phase applications such as PV inverters, a dedicated <strong data-start=\"4851\" data-end=\"4885\">3-phase inrush current limiter<\/strong> is usually required, as it must handle current surges simultaneously on all three phases.<\/p>\n<h3 data-start=\"4977\" data-end=\"5015\">Limitations of Traditional Methods<\/h3>\n<p data-start=\"5017\" data-end=\"5075\">Conventional inrush current mitigation approaches include:<\/p>\n<ul data-start=\"5077\" data-end=\"5552\">\n<li data-start=\"5077\" data-end=\"5230\">\n<p data-start=\"5079\" data-end=\"5230\"><strong data-start=\"5079\" data-end=\"5099\">Series resistors<\/strong><br data-start=\"5099\" data-end=\"5102\" \/>They limit inrush current but dissipate substantial power as heat, reducing efficiency and often requiring large heat sinks.<\/p>\n<\/li>\n<li data-start=\"5232\" data-end=\"5552\">\n<p data-start=\"5234\" data-end=\"5552\"><strong data-start=\"5234\" data-end=\"5253\">NTC thermistors<\/strong><br data-start=\"5253\" data-end=\"5256\" \/>They self-regulate to a lower resistance when warm, but have slower response times, are sensitive to ambient temperature and degrade over many cycles. This makes them less suitable for high-power systems that can start and stop multiple times per day (e.g. due to cloud cover or grid events).<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"5554\" data-end=\"5588\">Modern Inrush Current Limiters<\/h3>\n<p data-start=\"5590\" data-end=\"5674\">Modern ICLs, such as the <strong data-start=\"5615\" data-end=\"5636\">TPS-ICL-3P series<\/strong> from TPS elektronik, are designed to:<\/p>\n<ul data-start=\"5676\" data-end=\"5812\">\n<li data-start=\"5676\" data-end=\"5726\">\n<p data-start=\"5678\" data-end=\"5726\">Provide robust current limiting during startup<\/p>\n<\/li>\n<li data-start=\"5727\" data-end=\"5774\">\n<p data-start=\"5729\" data-end=\"5774\">Minimize power loss during normal operation<\/p>\n<\/li>\n<li data-start=\"5775\" data-end=\"5812\">\n<p data-start=\"5777\" data-end=\"5812\">Support frequent switching cycles<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5814\" data-end=\"6058\">In simple terms, an ICL introduces a controlled impedance when the system is energized. It limits the rate of current rise during the inrush phase and then transitions to a very low impedance so that normal current can flow with minimal losses.<\/p>\n<p data-start=\"6060\" data-end=\"6122\">For 3-phase 400 VAC PV inverters, an ideal ICL should provide:<\/p>\n<ul data-start=\"6124\" data-end=\"6481\">\n<li data-start=\"6124\" data-end=\"6202\">\n<p data-start=\"6126\" data-end=\"6202\"><strong data-start=\"6126\" data-end=\"6151\">3-phase compatibility<\/strong> with balanced current limiting across all phases<\/p>\n<\/li>\n<li data-start=\"6203\" data-end=\"6287\">\n<p data-start=\"6205\" data-end=\"6287\"><strong data-start=\"6205\" data-end=\"6230\">High current handling<\/strong> capability (typ. up to 500 A peak in this power class)<\/p>\n<\/li>\n<li data-start=\"6288\" data-end=\"6347\">\n<p data-start=\"6290\" data-end=\"6347\"><strong data-start=\"6290\" data-end=\"6316\">Wide temperature range<\/strong> for harsh outdoor conditions<\/p>\n<\/li>\n<li data-start=\"6348\" data-end=\"6405\">\n<p data-start=\"6350\" data-end=\"6405\"><strong data-start=\"6350\" data-end=\"6368\">Compact design<\/strong> for limited-space control cabinets<\/p>\n<\/li>\n<li data-start=\"6406\" data-end=\"6481\">\n<p data-start=\"6408\" data-end=\"6481\"><strong data-start=\"6408\" data-end=\"6430\">Compliance support<\/strong> for relevant surge and interconnection standards<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"6488\" data-end=\"6559\">TPS-ICL-3P Series: A High-Reliability 3-Phase Inrush Current Limiter<\/h2>\n<p data-start=\"6561\" data-end=\"6814\">TPS elektronik has developed the <strong data-start=\"6594\" data-end=\"6615\">TPS-ICL-3P series<\/strong> specifically to address inrush current challenges in 10\u201330 kW 3-phase PV inverters. The series combines robust performance with a compact form factor tailored for space-constrained control cabinets.<\/p>\n<h3 data-start=\"6816\" data-end=\"6851\">Key Features and Specifications<\/h3>\n<ul data-start=\"6853\" data-end=\"7409\">\n<li data-start=\"6853\" data-end=\"6930\">\n<p data-start=\"6855\" data-end=\"6930\"><strong data-start=\"6855\" data-end=\"6873\">Rated current:<\/strong> 25 A, matching typical 10\u201330 kW inverter input ratings<\/p>\n<\/li>\n<li data-start=\"6931\" data-end=\"7117\">\n<p data-start=\"6933\" data-end=\"7117\"><strong data-start=\"6933\" data-end=\"6961\">Inrush current handling:<\/strong> peak inrush currents can be limited to \u2264 100 A (depending on configuration), helping keep currents within the safe operating range of inverter components<\/p>\n<\/li>\n<li data-start=\"7118\" data-end=\"7213\">\n<p data-start=\"7120\" data-end=\"7213\"><strong data-start=\"7120\" data-end=\"7152\">Operating temperature range:<\/strong> \u221240 \u2103 to 70 \u2103 for reliable performance in extreme climates<\/p>\n<\/li>\n<li data-start=\"7214\" data-end=\"7344\">\n<p data-start=\"7216\" data-end=\"7344\"><strong data-start=\"7216\" data-end=\"7238\">Protection rating:<\/strong> IP20, providing finger-safe protection against solid objects \u2265 12 mm while allowing airflow for cooling<\/p>\n<\/li>\n<li data-start=\"7345\" data-end=\"7409\">\n<p data-start=\"7347\" data-end=\"7409\"><strong data-start=\"7347\" data-end=\"7365\">Fast response:<\/strong> response time &lt; 1 ms during inrush events<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"7411\" data-end=\"7543\">The TPS-ICL-3P series is designed as a compact, low-profile, narrow-width device with a small footprint. This makes it suitable for:<\/p>\n<ul data-start=\"7545\" data-end=\"7635\">\n<li data-start=\"7545\" data-end=\"7575\">\n<p data-start=\"7547\" data-end=\"7575\">Limited-space applications<\/p>\n<\/li>\n<li data-start=\"7576\" data-end=\"7604\">\n<p data-start=\"7578\" data-end=\"7604\">Crowded control cabinets<\/p>\n<\/li>\n<li data-start=\"7605\" data-end=\"7635\">\n<p data-start=\"7607\" data-end=\"7635\">High-density installations<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"7637\" data-end=\"7668\">Durability and Service Life<\/h3>\n<p data-start=\"7670\" data-end=\"7748\">The series is built using materials and components selected for resistance to:<\/p>\n<ul data-start=\"7750\" data-end=\"7796\">\n<li data-start=\"7750\" data-end=\"7769\">\n<p data-start=\"7752\" data-end=\"7769\">Thermal cycling<\/p>\n<\/li>\n<li data-start=\"7770\" data-end=\"7783\">\n<p data-start=\"7772\" data-end=\"7783\">Vibration<\/p>\n<\/li>\n<li data-start=\"7784\" data-end=\"7796\">\n<p data-start=\"7786\" data-end=\"7796\">Humidity<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"7798\" data-end=\"7982\">Solid-state design and the absence of moving parts help minimise mechanical wear. This supports a long service life and is aligned with the typical lifetime expectations of PV systems.<\/p>\n<h2 data-start=\"7989\" data-end=\"8054\">Two-Stage Protection: Front-End Limiting + Back-End Protection<\/h2>\n<p data-start=\"8056\" data-end=\"8182\">While a high-quality ICL is essential, optimal protection for PV inverters is achieved with a <strong data-start=\"8150\" data-end=\"8181\">holistic, two-stage concept<\/strong>:<\/p>\n<p data-start=\"8056\" data-end=\"8182\"><strong style=\"font-size: revert; color: initial;\" data-start=\"8186\" data-end=\"8242\">Stage 1 \u2013 Front-end current limiting with TPS-ICL-3P<\/strong><\/p>\n<p data-start=\"8186\" data-end=\"8321\"><strong data-start=\"8247\" data-end=\"8321\">Stage 2 \u2013 Back-end protection for residual surges and long-term stress<\/strong><\/p>\n<h3 data-start=\"8323\" data-end=\"8375\">Stage 1: TPS-ICL-3P at the 3-Phase 400 VAC Input<\/h3>\n<p data-start=\"8377\" data-end=\"8489\">The TPS-ICL-3P is installed at the inverter\u2019s 3-phase 400 VAC input, typically after the main disconnect switch.<\/p>\n<p data-start=\"8491\" data-end=\"8511\">Operating principle:<\/p>\n<ol data-start=\"8513\" data-end=\"9198\">\n<li data-start=\"8513\" data-end=\"8772\">\n<p data-start=\"8516\" data-end=\"8772\"><strong data-start=\"8516\" data-end=\"8533\">Startup phase<\/strong><br data-start=\"8533\" data-end=\"8536\" \/>When the inverter energizes, the TPS-ICL-3P detects the rapid current increase and introduces a controlled impedance. This limits the inrush to a defined level (for example 2\u20133 times the rated current) and slows capacitor charging.<\/p>\n<\/li>\n<li data-start=\"8774\" data-end=\"9009\">\n<p data-start=\"8777\" data-end=\"9009\"><strong data-start=\"8777\" data-end=\"8804\">Steady-state transition<\/strong><br data-start=\"8804\" data-end=\"8807\" \/>After the capacitors are charged (within milliseconds), the device transitions to a very low impedance so that the full rated current can flow with minimal power loss (typically \u2264 0.5 W per phase).<\/p>\n<\/li>\n<li data-start=\"9011\" data-end=\"9198\">\n<p data-start=\"9014\" data-end=\"9198\"><strong data-start=\"9014\" data-end=\"9035\">3-phase balancing<\/strong><br data-start=\"9035\" data-end=\"9038\" \/>The ICL is designed to achieve balanced current limiting across all three phases, which is especially beneficial under slightly unbalanced grid conditions.<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"9200\" data-end=\"9358\">This front-end limiting helps avoid triggering the inverter\u2019s OCP during startup and reduces electrical stress on input capacitors, relays and semiconductors.<\/p>\n<h3 data-start=\"9360\" data-end=\"9392\">Stage 2: Back-End Protection<\/h3>\n<p data-start=\"9394\" data-end=\"9492\">Downstream of the TPS-ICL-3P, additional components address residual surges and long-term effects:<\/p>\n<ul data-start=\"9494\" data-end=\"9784\">\n<li data-start=\"9494\" data-end=\"9594\">\n<p data-start=\"9496\" data-end=\"9594\"><strong data-start=\"9496\" data-end=\"9531\">Surge Protective Devices (SPDs)<\/strong> to clamp voltage transients (e.g. lightning, grid switching)<\/p>\n<\/li>\n<li data-start=\"9595\" data-end=\"9678\">\n<p data-start=\"9597\" data-end=\"9678\"><strong data-start=\"9597\" data-end=\"9624\">Thermal overload relays<\/strong> as backup protection against sustained overcurrents<\/p>\n<\/li>\n<li data-start=\"9679\" data-end=\"9784\">\n<p data-start=\"9681\" data-end=\"9784\"><strong data-start=\"9681\" data-end=\"9696\">EMI filters<\/strong> to reduce electromagnetic interference and support EMC compliance (e.g. EN 61000-6-3)<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"9786\" data-end=\"9943\">The combination of front-end inrush limiting and back-end surge and overload protection provides a comprehensive, layered protection scheme for the inverter.<\/p>\n<h2 data-start=\"9950\" data-end=\"10010\">Space Efficiency: Designed for Limited-Space Applications<\/h2>\n<p data-start=\"10012\" data-end=\"10219\">Outdoor PV control cabinets are typically compact and densely populated with inverters, breakers, meters and communication modules. Space efficiency is therefore a key selection criterion for all components.<\/p>\n<p data-start=\"10221\" data-end=\"10270\">The TPS-ICL-3P series addresses this by offering:<\/p>\n<ul data-start=\"10272\" data-end=\"10403\">\n<li data-start=\"10272\" data-end=\"10320\">\n<p data-start=\"10274\" data-end=\"10320\">Low profile housing (typical height \u2264 30 mm)<\/p>\n<\/li>\n<li data-start=\"10321\" data-end=\"10357\">\n<p data-start=\"10323\" data-end=\"10357\">Narrow width per phase (\u2264 45 mm)<\/p>\n<\/li>\n<li data-start=\"10358\" data-end=\"10403\">\n<p data-start=\"10360\" data-end=\"10403\">Slim depth (\u2264 60 mm) for shallow cabinets<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"10405\" data-end=\"10440\">This makes the series suitable for:<\/p>\n<ul data-start=\"10442\" data-end=\"10640\">\n<li data-start=\"10442\" data-end=\"10502\">\n<p data-start=\"10444\" data-end=\"10502\">Limited-space applications where every millimetre counts<\/p>\n<\/li>\n<li data-start=\"10503\" data-end=\"10573\">\n<p data-start=\"10505\" data-end=\"10573\">High-density installations with many components in close proximity<\/p>\n<\/li>\n<li data-start=\"10574\" data-end=\"10640\">\n<p data-start=\"10576\" data-end=\"10640\">Retrofits of existing PV systems with already crowded cabinets<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"10642\" data-end=\"10809\">DIN-rail mounting (standard in industrial control cabinets) allows quick installation in various orientations and simplifies integration into new and existing layouts.<\/p>\n<p data-start=\"10811\" data-end=\"11000\">Compared with traditional inrush protection solutions that require bulky heat sinks or separate enclosures, the TPS-ICL-3P can significantly reduce the space required for inrush protection<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5304\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2025\/11\/7bc0de34-3bd6-4456-8ab0-914f8ec26e46.jpg\" alt=\" 3-Phase Inrush Current Limiter for small PV inverters, solving inrush current and grid compliance\" width=\"1920\" height=\"1440\" \/><\/p>\n<p><!-- \/wp:paragraph --><\/p>\n<p><!-- wp:heading --><\/p>\n<h2 data-start=\"11007\" data-end=\"11043\">Reliability in Harsh Environments<\/h2>\n<p data-start=\"11045\" data-end=\"11216\">PV inverters are often installed in challenging environments \u2013 from cold northern climates to hot desert regions. The TPS-ICL-3P series is engineered for these conditions.<\/p>\n<p data-start=\"11218\" data-end=\"11238\">Key aspects include:<\/p>\n<ul data-start=\"11240\" data-end=\"12048\">\n<li data-start=\"11240\" data-end=\"11513\">\n<p data-start=\"11242\" data-end=\"11513\"><strong data-start=\"11242\" data-end=\"11294\">Wide operating temperature range (\u221240 \u2103 to 70 \u2103)<\/strong><br data-start=\"11294\" data-end=\"11297\" \/>High-temperature-resistant plastics and metal alloys maintain mechanical and electrical properties across the range. Components are rated for repeated thermal cycling to reduce risks such as solder joint fatigue.<\/p>\n<\/li>\n<li data-start=\"11515\" data-end=\"11745\">\n<p data-start=\"11517\" data-end=\"11745\"><strong data-start=\"11517\" data-end=\"11536\">IP20 protection<\/strong><br data-start=\"11536\" data-end=\"11539\" \/>While the outer cabinet typically provides weather protection, IP20 helps prevent accidental contact and reduces the risk of faults caused by larger solid foreign objects, while maintaining ventilation.<\/p>\n<\/li>\n<li data-start=\"11747\" data-end=\"12048\">\n<p data-start=\"11749\" data-end=\"12048\"><strong data-start=\"11749\" data-end=\"11773\">Vibration resistance<\/strong><br data-start=\"11773\" data-end=\"11776\" \/>PV cabinets can be mounted on poles, rooftops or ground structures that are exposed to wind-induced vibrations. The TPS-ICL-3P series is designed and tested according to relevant vibration standards (e.g. IEC 60068-2-6) to ensure stable operation in such environments.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"12055\" data-end=\"12089\">Compliance and Standard Support<\/h2>\n<p data-start=\"12091\" data-end=\"12323\">Grid-connection and safety standards define strict requirements for inrush behaviour, surge immunity and protection. The TPS-ICL-3P series is designed to support compliance with key international and regional standards, for example:<\/p>\n<ul data-start=\"12325\" data-end=\"12544\">\n<li data-start=\"12325\" data-end=\"12388\">\n<p data-start=\"12327\" data-end=\"12388\"><strong data-start=\"12327\" data-end=\"12344\">IEC 61000-4-5<\/strong> \u2013 surge immunity for electrical equipment<\/p>\n<\/li>\n<li data-start=\"12389\" data-end=\"12470\">\n<p data-start=\"12391\" data-end=\"12470\"><strong data-start=\"12391\" data-end=\"12404\">IEEE 1547<\/strong> \u2013 interconnection of distributed energy resources with the grid<\/p>\n<\/li>\n<li data-start=\"12471\" data-end=\"12544\">\n<p data-start=\"12473\" data-end=\"12544\"><strong data-start=\"12473\" data-end=\"12485\">EN 62109<\/strong> \u2013 safety of power converters for use in PV power systems<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"12546\" data-end=\"12833\">Depending on the specific system design and region, certification by notified bodies such as T\u00dcV, UL and CE can be achieved as part of the overall inverter and system approval process. This helps reduce time-to-market for manufacturers and simplifies homologation for system integrators.<\/p>\n<p data-start=\"12835\" data-end=\"12989\"><em data-start=\"12835\" data-end=\"12989\">(Note: always verify the current certification status of the specific product variant before making binding claims in datasheets or marketing material.)<\/em><\/p>\n<h2 data-start=\"12996\" data-end=\"13030\">Real-World Example Applications<\/h2>\n<h3 data-start=\"13032\" data-end=\"13095\">Case Study 1: 20 kW Commercial PV System in Southern Europe<\/h3>\n<p data-start=\"13097\" data-end=\"13461\">A 20 kW commercial PV system in Spain experienced frequent inverter restarts \u2013 up to five times per day during peak sunshine hours. The original installation used a 3-phase 400 VAC inverter without dedicated inrush protection. Measured inrush peaks were around 350 A during grid connection, regularly triggering the inverter\u2019s OCP and reducing annual energy yield.<\/p>\n<p data-start=\"13463\" data-end=\"13869\">After integrating the TPS-ICL-3P series as part of a two-stage protection concept, measured inrush peaks were reduced to around 80 A, clearly below the OCP threshold in this installation. The number of restarts dropped significantly and the operator reported an increase in effective energy yield. The compact footprint allowed installation in the existing control cabinet without major mechanical changes.<\/p>\n<h3 data-start=\"13871\" data-end=\"13934\">Case Study 2: 30 kW Industrial PV System in Northern Europe<\/h3>\n<p data-start=\"13936\" data-end=\"14199\">A 30 kW industrial PV system in Sweden initially failed to meet local grid operator requirements, as inrush current exceeded the specified 120 A limit for 25 A equipment. The cold climate (down to \u221225 \u2103 in winter) also raised concerns about long-term reliability.<\/p>\n<p data-start=\"14201\" data-end=\"14562\">After installing the TPS-ICL-3P series, inrush peaks were reduced to approx. 95 A in this system, bringing the installation within the operator\u2019s limits. The wide operating temperature range helped ensure reliable performance through the winter season, and the low profile housing made it possible to integrate the device into an already densely packed cabinet.<\/p>\n<h2 data-start=\"14569\" data-end=\"14627\">Choosing the Right Inrush Current Limiter: Key Criteria<\/h2>\n<p data-start=\"14629\" data-end=\"14706\">When selecting an inrush current limiter for a 3-phase PV inverter, consider:<\/p>\n<ol data-start=\"14708\" data-end=\"15968\">\n<li data-start=\"14708\" data-end=\"14892\">\n<p data-start=\"14711\" data-end=\"14892\"><strong data-start=\"14711\" data-end=\"14734\">Phase compatibility<\/strong><br data-start=\"14734\" data-end=\"14737\" \/>Use a dedicated 3-phase inrush current limiter rather than adapting single-phase devices. The TPS-ICL-3P is engineered for balanced 3-phase operation.<\/p>\n<\/li>\n<li data-start=\"14894\" data-end=\"15112\">\n<p data-start=\"14897\" data-end=\"15112\"><strong data-start=\"14897\" data-end=\"14914\">Rated current<\/strong><br data-start=\"14914\" data-end=\"14917\" \/>Match the limiter\u2019s rated current to the inverter\u2019s operating current (e.g. 25 A for many 10\u201330 kW inverters). Oversizing can weaken the limiting effect; undersizing can lead to overheating.<\/p>\n<\/li>\n<li data-start=\"15114\" data-end=\"15334\">\n<p data-start=\"15117\" data-end=\"15334\"><strong data-start=\"15117\" data-end=\"15147\">Inrush handling capability<\/strong><br data-start=\"15147\" data-end=\"15150\" \/>Check that the limiter can handle the expected peak inrush current (often 10\u201320\u00d7 the rated current). The TPS-ICL-3P is designed for peaks up to 500 A (depending on configuration).<\/p>\n<\/li>\n<li data-start=\"15336\" data-end=\"15548\">\n<p data-start=\"15339\" data-end=\"15548\"><strong data-start=\"15339\" data-end=\"15360\">Temperature range<\/strong><br data-start=\"15360\" data-end=\"15363\" \/>Choose a device with an operating range that covers the actual cabinet temperatures at the installation site. The \u221240 \u2103 to 70 \u2103 range of the TPS-ICL-3P covers most global climates.<\/p>\n<\/li>\n<li data-start=\"15550\" data-end=\"15754\">\n<p data-start=\"15553\" data-end=\"15754\"><strong data-start=\"15553\" data-end=\"15574\">Space constraints<\/strong><br data-start=\"15574\" data-end=\"15577\" \/>Opt for compact designs with low profile and narrow width for limited-space applications. The small footprint of the TPS-ICL-3P is well suited for crowded control cabinets.<\/p>\n<\/li>\n<li data-start=\"15756\" data-end=\"15968\">\n<p data-start=\"15759\" data-end=\"15968\"><strong data-start=\"15759\" data-end=\"15797\">Standard and certification support<\/strong><br data-start=\"15797\" data-end=\"15800\" \/>Ensure the device supports relevant regional and international standards and can be used within certified system designs (e.g. T\u00dcV in Europe, UL in North America).<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"15970\" data-end=\"16123\">By taking these factors into account, engineers can select an ICL that protects the inverter effectively and integrates smoothly into the overall system.<\/p>\n<h2 data-start=\"16130\" data-end=\"16166\">Frequently Asked Questions (FAQs)<\/h2>\n<h3 data-start=\"16168\" data-end=\"16236\">What is inrush current, and why is it a problem in PV inverters?<\/h3>\n<p data-start=\"16238\" data-end=\"16579\">Inrush current is a short-duration current spike that occurs when a device is energized. In PV inverters it is primarily caused by the rapid charging of input capacitors and can exceed the rated current by a factor of 10 or more. If not controlled, it can trigger protective shutdowns, stress components and impact grid-connection behaviour.<\/p>\n<h3 data-start=\"16581\" data-end=\"16647\">What is an inrush current limiter (ICL), and how does it work?<\/h3>\n<p data-start=\"16649\" data-end=\"16932\">An ICL is a device that temporarily introduces a controlled impedance into the circuit when it is switched on. It limits inrush current to a defined level and then transitions to a very low impedance in steady-state operation, so that normal current can flow with minimal power loss.<\/p>\n<h3 data-start=\"16934\" data-end=\"17005\">Why is a 3-phase inrush current limiter necessary for PV inverters?<\/h3>\n<p data-start=\"17007\" data-end=\"17233\">3-phase PV inverters draw inrush current on all three phases. A dedicated 3-phase inrush current limiter is designed to provide balanced protection across all phases and to support compliance with grid-connection requirements.<\/p>\n<h3 data-start=\"17235\" data-end=\"17306\">How does the TPS-ICL-3P series fit into limited-space applications?<\/h3>\n<p data-start=\"17308\" data-end=\"17522\">The TPS-ICL-3P series features a compact, low-profile, narrow-width design. This leads to a small footprint that is well suited for high-density installations and crowded PV control cabinets where space is limited.<\/p>\n<h3 data-start=\"17524\" data-end=\"17586\">Can the TPS-ICL-3P series operate in extreme temperatures?<\/h3>\n<p data-start=\"17588\" data-end=\"17836\">Yes. The TPS-ICL-3P has an operating temperature range of \u221240 \u2103 to 70 \u2103. It is designed and tested for use in harsh outdoor environments, from cold winter conditions to hot summer climates, when installed according to the manufacturer\u2019s guidelines.<\/p>\n<h2 data-start=\"17843\" data-end=\"17922\">Conclusion: TPS-ICL-3P \u2013 A Practical Solution for Small 3-Phase PV Inverters<\/h2>\n<p data-start=\"17924\" data-end=\"18268\">The 10\u201330 kW small PV inverter segment requires robust and space-efficient solutions to handle inrush surge currents at 3-phase 400 VAC inputs. The <strong data-start=\"18072\" data-end=\"18093\">TPS-ICL-3P series<\/strong> from TPS elektronik provides a targeted approach to this challenge by combining high-performance 3-phase inrush limiting with a compact design for limited-space applications.<\/p>\n<p data-start=\"18270\" data-end=\"18721\">By implementing a \u201cfront-end current limiting + back-end protection\u201d two-stage scheme, PV system designers can significantly reduce unnecessary inverter restarts, ease component stress and support compliance with grid and safety standards. The 25 A rating, IP20 protection and \u221240 \u2103 to 70 \u2103 operating range make the TPS-ICL-3P suitable for a wide range of environments, while its compact footprint simplifies integration into crowded control cabinets.<\/p>\n<p data-start=\"18723\" data-end=\"19097\">As PV deployment continues to grow, the reliability of inverters remains a key factor in project performance. The TPS-ICL-3P series offers a technically sound, space-saving inrush current limiting solution for small 3-phase PV inverters \u2013 helping system integrators, manufacturers and operators improve availability and reduce downtime without compromising on cabinet space.<\/p>\n<p data-start=\"18723\" data-end=\"19097\">\u00a0<\/p>\n<p><!-- \/wp:paragraph --><\/p>\n<p><!-- wp:wpforms\/form-selector {\"clientId\":\"7472c15a-e2ec-4a7d-9ac9-944c61c5ca55\",\"formId\":\"4659\",\"theme\":\"default\",\"themeName\":\"Default\",\"copyPasteJsonValue\":\"{\\u0022displayTitle\\u0022:false,\\u0022displayDesc\\u0022:false,\\u0022theme\\u0022:\\u0022default\\u0022,\\u0022themeName\\u0022:\\u0022Default\\u0022,\\u0022fieldSize\\u0022:\\u0022medium\\u0022,\\u0022backgroundImage\\u0022:\\u0022none\\u0022,\\u0022backgroundPosition\\u0022:\\u0022center center\\u0022,\\u0022backgroundRepeat\\u0022:\\u0022no-repeat\\u0022,\\u0022backgroundSizeMode\\u0022:\\u0022cover\\u0022,\\u0022backgroundSize\\u0022:\\u0022cover\\u0022,\\u0022backgroundWidth\\u0022:\\u0022100px\\u0022,\\u0022backgroundHeight\\u0022:\\u0022100px\\u0022,\\u0022backgroundUrl\\u0022:\\u0022url()\\u0022,\\u0022backgroundColor\\u0022:\\u0022rgba( 0, 0, 0, 0 )\\u0022,\\u0022fieldBorderRadius\\u0022:\\u00223px\\u0022,\\u0022fieldBorderStyle\\u0022:\\u0022solid\\u0022,\\u0022fieldBorderSize\\u0022:\\u00221px\\u0022,\\u0022fieldBackgroundColor\\u0022:\\u0022#ffffff\\u0022,\\u0022fieldBorderColor\\u0022:\\u0022rgba( 0, 0, 0, 0.25 )\\u0022,\\u0022fieldTextColor\\u0022:\\u0022rgba( 0, 0, 0, 0.7 )\\u0022,\\u0022fieldMenuColor\\u0022:\\u0022#ffffff\\u0022,\\u0022labelSize\\u0022:\\u0022medium\\u0022,\\u0022labelColor\\u0022:\\u0022rgba( 0, 0, 0, 0.85 )\\u0022,\\u0022labelSublabelColor\\u0022:\\u0022rgba( 0, 0, 0, 0.55 )\\u0022,\\u0022labelErrorColor\\u0022:\\u0022#d63637\\u0022,\\u0022buttonSize\\u0022:\\u0022medium\\u0022,\\u0022buttonBorderStyle\\u0022:\\u0022none\\u0022,\\u0022buttonBorderSize\\u0022:\\u00221px\\u0022,\\u0022buttonBorderRadius\\u0022:\\u00223px\\u0022,\\u0022buttonBackgroundColor\\u0022:\\u0022#066aab\\u0022,\\u0022buttonTextColor\\u0022:\\u0022#ffffff\\u0022,\\u0022buttonBorderColor\\u0022:\\u0022#066aab\\u0022,\\u0022pageBreakColor\\u0022:\\u0022#066aab\\u0022,\\u0022containerPadding\\u0022:\\u00220px\\u0022,\\u0022containerBorderStyle\\u0022:\\u0022none\\u0022,\\u0022containerBorderWidth\\u0022:\\u00221px\\u0022,\\u0022containerBorderColor\\u0022:\\u0022#000000\\u0022,\\u0022containerBorderRadius\\u0022:\\u00223px\\u0022,\\u0022containerShadowSize\\u0022:\\u0022none\\u0022,\\u0022customCss\\u0022:\\u0022\\u0022}\"} \/--><\/p>\n\n<!-- wp:html -->\n<section id=\"tps-din-rail-carousel\" class=\"tps-carousel-section\">\n\n  <p class=\"tps-carousel-intro\">\n    Discover the TPS-ICL-3P inrush current limiter series for 3-phase 400&nbsp;V&nbsp;AC inputs, available in 12&nbsp;A and 25&nbsp;A versions for PV inverters and industrial control cabinets.\n  <\/p>\n\n  <div class=\"tps-carousel-wrapper\">\n    <button class=\"tps-carousel-nav tps-carousel-nav--prev\" type=\"button\" aria-label=\"Previous products\">\n      &#10094;\n    <\/button>\n\n    <div class=\"tps-carousel-track\" id=\"tpsCarouselTrack\">\n      <!-- Product 1: TPS-ICL-3P-12A -->\n      <article class=\"tps-carousel-item\">\n        <a href=\"https:\/\/www.shop-tps.com\/de\/shop\/tps-icl-3p-12a-20498#attr=\" class=\"tps-carousel-link\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">\n          <img decoding=\"async\"\n            src=\"https:\/\/www.shop-tps.com\/web\/image\/product.product\/20389\/image_1024\/%5BIL1004%5D%20TPS-ICL-3P-12A?unique=f7d4b3e\"\n            alt=\"TPS-ICL-3P-12A 3-phase inrush current limiter\"\n            class=\"tps-carousel-image\"\n          \/>\n\n          <h3 class=\"tps-carousel-product-name\">TPS-ICL-3P-12A<\/h3>\n          <p class=\"tps-carousel-product-spec\">\n            3-phase inrush current limiter, 12&nbsp;A. Ideal for small 3-phase PV inverters and compact industrial control panels.\n          <\/p>\n          <span class=\"tps-carousel-cta\">View product<\/span>\n        <\/a>\n      <\/article>\n<!-- Product 2: TPS-ICL-3P-16A -->\n      <article class=\"tps-carousel-item\">\n        <a href=\"https:\/\/www.shop-tps.com\/de\/shop\/tps-icl-3p-16a-20499#attr=\" class=\"tps-carousel-link\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">\n          <img decoding=\"async\"\n            src=\"https:\/\/www.shop-tps.com\/web\/image\/product.product\/20390\/image_1024\/%5BIL1005%5D%20TPS-ICL-3P-16A?unique=d3583ef\"\n            alt=\"TPS-ICL-3P-16A 3-phase inrush current limiter\"\n            class=\"tps-carousel-image\"\n          \/>\n\n          <h3 class=\"tps-carousel-product-name\">TPS-ICL-3P-16A<\/h3>\n          <p class=\"tps-carousel-product-spec\">\n            3-phase inrush current limiter, 16&nbsp;A. Ideal for  protecting motors, transformers, and other three-phase inductive\/capacitive loads from damaging inrush currents.\n          <\/p>\n          <span class=\"tps-carousel-cta\">View product<\/span>\n        <\/a>\n      <\/article>\n      <!-- Product 3: TPS-ICL-3P-25A -->\n      <article class=\"tps-carousel-item\">\n        <a href=\"https:\/\/www.shop-tps.com\/de\/shop\/tps-icl-3p-25a-20500#attr=\" class=\"tps-carousel-link\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">\n          <img decoding=\"async\"\n            src=\"https:\/\/www.shop-tps.com\/web\/image\/product.product\/20391\/image_1024\/%5BIL1006%5D%20TPS-ICL-3P-25A?unique=b33bc9c\"\n            alt=\"TPS-ICL-3P-25A 3-phase inrush current limiter\"\n            class=\"tps-carousel-image\"\n          \/>\n\n          <h3 class=\"tps-carousel-product-name\">TPS-ICL-3P-25A<\/h3>\n          <p class=\"tps-carousel-product-spec\">\n            3-phase inrush current limiter, 25&nbsp;A. Designed for 10\u201330&nbsp;kW PV inverters and demanding industrial applications.\n          <\/p>\n          <span class=\"tps-carousel-cta\">View product<\/span>\n        <\/a>\n      <\/article>\n    <\/div>\n\n    <button class=\"tps-carousel-nav tps-carousel-nav--next\" type=\"button\" aria-label=\"Next products\">\n      &#10095;\n    <\/button>\n  <\/div>\n<\/section>\n\n<style>\n  .tps-carousel-section {\n    margin: 3rem 0;\n    font-family: inherit;\n  }\n\n  .tps-carousel-title {\n    font-size: 1.6rem;\n    margin-bottom: 0.5rem;\n  }\n\n  .tps-carousel-intro {\n    max-width: 720px;\n    margin-bottom: 1.5rem;\n    line-height: 1.5;\n  }\n\n  .tps-carousel-wrapper {\n    position: relative;\n    display: flex;\n    align-items: center;\n  }\n\n  .tps-carousel-track {\n    display: flex;\n    gap: 1rem;\n    overflow-x: auto;\n    scroll-behavior: smooth;\n    padding: 0.5rem 0;\n  }\n\n  .tps-carousel-track::-webkit-scrollbar {\n    height: 6px;\n  }\n\n  .tps-carousel-track::-webkit-scrollbar-thumb {\n    background: #ccc;\n    border-radius: 3px;\n  }\n\n  .tps-carousel-item {\n    min-width: 230px;\n    max-width: 260px;\n    flex: 0 0 auto;\n    border: 1px solid #e1e1e1;\n    border-radius: 8px;\n    padding: 1rem;\n    background: #fff;\n    box-shadow: 0 2px 6px rgba(0,0,0,0.04);\n  }\n\n  .tps-carousel-link {\n    text-decoration: none;\n    color: inherit;\n    display: block;\n    height: 100%;\n  }\n\n  .tps-carousel-image {\n    width: 100%;\n    border-radius: 6px;\n    margin-bottom: 0.75rem;\n  }\n\n  .tps-carousel-product-name {\n    font-size: 1rem;\n    margin: 0 0 0.4rem;\n  }\n\n  .tps-carousel-product-spec {\n    font-size: 0.9rem;\n    line-height: 1.4;\n    margin-bottom: 0.8rem;\n  }\n\n  .tps-carousel-cta {\n    display: inline-block;\n    font-size: 0.9rem;\n    font-weight: 600;\n    border-radius: 999px;\n    padding: 0.35rem 0.9rem;\n    border: 1px solid #0072b8;\n    color: #0072b8;\n  }\n\n  .tps-carousel-cta:hover {\n    background: #0072b8;\n    color: #fff;\n  }\n\n  .tps-carousel-nav {\n    border: none;\n    background: #ffffff;\n    border-radius: 50%;\n    width: 32px;\n    height: 32px;\n    box-shadow: 0 2px 6px rgba(0,0,0,0.15);\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    cursor: pointer;\n    margin: 0 0.25rem;\n    flex-shrink: 0;\n  }\n\n  .tps-carousel-nav--prev {\n    margin-right: 0.5rem;\n  }\n\n  .tps-carousel-nav--next {\n    margin-left: 0.5rem;\n  }\n\n  @media (max-width: 768px) {\n    .tps-carousel-wrapper {\n      align-items: stretch;\n    }\n\n    .tps-carousel-item {\n      min-width: 75%;\n    }\n\n    .tps-carousel-nav {\n      display: none; \/* optional: hide arrows on mobile, scroll by swipe *\/\n    }\n  }\n<\/style>\n\n<script>\n  (function() {\n    const track = document.getElementById('tpsCarouselTrack');\n    if (!track) return;\n\n    const prevBtn = document.querySelector('.tps-carousel-nav--prev');\n    const nextBtn = document.querySelector('.tps-carousel-nav--next');\n\n    function scrollByCard(direction) {\n      const firstItem = track.querySelector('.tps-carousel-item');\n      if (!firstItem) return;\n      const cardWidth = firstItem.getBoundingClientRect().width + 16; \/\/ card + gap\n      track.scrollBy({\n        left: direction * cardWidth,\n        behavior: 'smooth'\n      });\n    }\n\n    if (prevBtn) {\n      prevBtn.addEventListener('click', function() {\n        scrollByCard(-1);\n      });\n    }\n\n    if (nextBtn) {\n      nextBtn.addEventListener('click', function() {\n        scrollByCard(1);\n      });\n    }\n  })();\n<\/script>\n\n<!-- \/wp:html -->","protected":false},"excerpt":{"rendered":"<p>why inrush current remains one of the most underestimated reliability risks in small three-phase PV inverters and how a modern two-stage protection concept can dramatically improve system stability. We dive into the root causes of inrush events, explain the limitations of traditional methods, and highlight how the TPS-ICL-3P series provides a compact, high-reliability solution for space-constrained PV control cabinets. Real-world case studies illustrate measurable improvements in uptime, grid compliance, and overall system performance.<\/p>\n","protected":false},"author":7,"featured_media":5310,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-5117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-production"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Inrush Current Limiter for Small PV Inverters: 3-Phase 400 VAC Input Surge Protection &amp; High-Reliability Applications - TPS<\/title>\n<meta name=\"description\" content=\"Inrush Current Limiter: 3-phase 400VAC surge protection for 10-30kW small PV inverters. Solve inrush surge current, frequent restarts &amp; grid compliance with compact, industrial-grade -40\u2103~70\u2103 design.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tps-elektronik.com\/en\/inrush-current-limiter-for-small-pv-inverters-3-phase-400vac-input-surge-protection-high-reliability-applications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Inrush Current Limiter for Small PV Inverters: 3-Phase 400 VAC Input Surge Protection &amp; High-Reliability Applications - TPS\" \/>\n<meta property=\"og:description\" content=\"Inrush Current Limiter: 3-phase 400VAC surge protection for 10-30kW small PV inverters. 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