Key Takeaways
- The FSP300-70PFL(SK) power supply is a robust 300W switching power supply designed as an ATX industrial power supply for industrial PCs, workstations and automation systems.
- This AC line powered PSU features an active PFC circuit and full range 90-264VAC input, ensuring stable operation worldwide in single- or three-phase installations.
- Its multi output 3.3V 5V 12V 5Vsb rails deliver tightly regulated power for motherboards, drives and peripherals, backed by over voltage protection, short circuit protection and over current protection.
- As a high efficiency power supply with low standby power consumption, it supports modern energy-saving requirements while maintaining a wide operating temperature range suitable for industrial environments.
- With MTBF 100000 hours reliability and being FCC CISPR22 Class B compliant, the unit offers long-term dependable performance and easy integration into EMC-sensitive systems.
The FSP300-70PFL(SK) is a compact yet powerful 300 W ATX PSU built for industrial rather than consumer duty. Where standard desktop supplies struggle with harsh environments, 24/7 runtimes and tight EMC limits, this unit provides proven reliability, global approvals and carefully engineered protection features.
Industrial ATX PC power supply for demanding environments
According to its product positioning, the FSP300-70PFL(SK) is targeted at industrial PCs, workstations, servers and automation controllers that need a rugged ATX form factor supply rather than a consumer desktop unit. The supply offers 300 W continuous output, an integrated 80 mm fan for forced-air cooling and is tested under elevated temperatures to ensure long life in closed cabinets and 24/7 operation.
Built on an AC line powered PSU platform with an active PFC circuit, the design corrects power factor and helps systems meet EN61000-3-2 harmonic limits while providing stable DC rails under varying AC conditions.
Electrical performance and multi-output rails
As a true ATX industrial power supply, the FSP300-70PFL(SK) provides a multi output 3.3V 5V 12V 5Vsb configuration, including dual +12 V rails, −12 V and optional −5 V to support legacy interfaces. Each rail is regulated within tight tolerances with low ripple and noise, ensuring stable operation for CPUs, chipsets, storage devices and add-in cards.
The total DC output is rated at 300 W, with up to 19 A on +3.3 V, 16 A on +5 V and 17 A each on the +12V1 and +12V2 rails, giving designers flexibility to support both modern 12 V heavy-load systems and traditional 5 V–centric architectures. Hold-up time of at least 12 ms at full load prevents PC resets during short AC dips.
A dedicated power good signal (P.G.) is provided as a TTL-level output so the motherboard can monitor the health of the DC rails and guarantee an orderly start-up and shutdown sequence.
Wide input range, PFC and efficiency
The input stage supports a full range 90-264VAC input at 47–63 Hz, meaning the same FSP300-70PFL(SK) power supply can be deployed worldwide without manual range switching. This simplifies logistics and ensures stable operation from low AC voltages often encountered in industrial plants.
With its active PFC circuit and optimized topology, the unit operates as a high efficiency power supply, achieving typical efficiencies in the mid-80% range at 50% load. At 20% and 100% load it still maintains strong performance, helping reduce heat inside the chassis and lowering overall energy consumption.
The 5 V standby rail is designed for low standby power consumption, meeting modern eco-design requirements such as the EU’s Lot 6 by delivering high efficiency even at low 5Vsb loading levels. This makes wake-on-LAN, remote start and other standby functions possible without sacrificing energy efficiency.
Protection features and long-term reliability
The FSP300-70PFL(SK) integrates comprehensive protection functions: over voltage protection on all main rails, short circuit protection and over current protection on the +3.3 V, +5 V and +12 V outputs. In the event of a severe fault, the PSU shuts down safely and either latches off or recovers automatically after the fault is removed, preventing damage to connected hardware.
Mechanical robustness is supported by shock and vibration specifications suitable for industrial installations. Combined with tested burn-in at elevated temperatures, the design achieves MTBF 100000 hours reliability (calculated according to MIL-HDBK-217 at 25 °C, nominal input and full load), ensuring long service life in continuous operation.
Temperature, environment and EMC compliance
The PSU supports a wide operating temperature range from 0 °C to +50 °C at full 300 W load, with storage from −20 °C up to +80 °C. This allows deployment in control cabinets, factory floors and other environments where ambient conditions vary significantly over the year.
From an EMC standpoint, the design meets the radiated and conducted emission limits for FCC Part 15 and CISPR 22 Class B, making it FCC CISPR22 Class B compliant. This simplifies system certification for OEMs integrating the PSU into finished equipment destined for residential and light-industrial environments.
Why engineers choose the FSP300-70PFL(SK)
As highlighted on the product’s landing page, this 300 W ATX industrial power supply combines 80 PLUS Bronze–class efficiency with industrial-grade protections including OCP, OVP, OTP and short-circuit shutdown. Each unit is Hi-Pot tested and burned in at up to 50 °C, cooled by a built-in 80 mm fan inside a compact PS2 metal housing, and backed by global safety and environmental certifications such as RoHS, CE, UL, WEEE and UKCA.
Typical applications
- Industrial PCs and panel PCs used in process control, SCADA, and machine vision systems.
- Rugged workstations and embedded servers for manufacturing execution systems (MES) and data acquisition.
- Automation controllers, test rigs and measurement equipment that demand stable ATX rails and reliable soft start via PS_ON and the power good signal.
- Upgrades of legacy industrial systems where a form-factor compatible, energy-efficient replacement PSU is required.
Conclusion
The FSP300-70PFL(SK) power supply delivers the combination of performance, protection and reliability that industrial PC builders and automation engineers need. As a 300W switching power supply with global AC compatibility, rich ATX outputs and industrial-grade protections, it is an excellent choice wherever a compact, efficient and standards-compliant ATX industrial power supply is required.
