Pepperl+Fuchs KFA6-STR-1.24.500 Power Unit | 500mA Rail Mount

Global PLC Spare HUB Insight

The KFA6-STR-1.24.500 by Pepperl+Fuchs is a specialized power conditioning module engineered for industrial control cabinets. Unlike standard commercial power supplies, this unit is purpose-built to integrate directly with the Power Rail system, eliminating complex daisy-chained cabling and reducing wiring-induced noise in sensitive instrumentation loops. We recommend the KFA6-STR-1.24.500 for compact PLC enclosures where space is at a premium and reliable, isolated 24 V DC power for intrinsic safety barriers is mission-critical. Its electronic current limiting provides superior protection compared to traditional fuses, ensuring that local faults do not propagate through the entire rack.

Technical Power Specifications

• Manufacturer: Pepperl+Fuchs
• Model: KFA6-STR-1.24.500
• Input Range: 90 ... 253 V AC (48 ... 63 Hz)
• Output Voltage: 24 V DC (Regulated)
• Rated Current: 500 mA at 60 °C
• Power Dissipation: 2.5 W
• Protection Type: Electronic, permanent short-circuit protection
• Mounting: 35 mm DIN Rail (EN 60715)
• Protection Rating: IP20
• Physical Dimensions: 20 mm x 119 mm x 115 mm (Housing B2)

Diagnostic Capability & Application Utility

• System Integration: Designed for seamless docking with Power Rail segments to distribute power to adjacent isolated barriers, minimizing installation time.
• Thermal Resiliency: Engineered to maintain a full 500 mA output at ambient temperatures up to 60 °C, ensuring stable operation in high-density, non-ventilated cabinets.
• Safe Isolation: Provides reliable galvanic isolation per DIN VDE 0106, preventing line-voltage feedback into low-voltage signal loops.
• Application Suitability: Ideal for powering multi-channel signal conditioners, HART interfaces, and solenoid drivers in process automation environments.

Shipping & Quality Assurance

• Global Logistics: Efficient delivery via FedEx, UPS, or DHL.
• Lead Time: Orders are processed and dispatched within 24 to 48 hours.
• Warranty: Every KFA6-STR-1.24.500 unit is protected by a 12-month full performance warranty.
• Package Contents: 1x KFA6-STR-1.24.500 Power Supply unit and instruction manual.

Professional FAQ

Question: Can I use this power supply as a standalone unit without the Power Rail?

Answer: Yes, the unit includes removable screw terminals, allowing it to function as a standalone 24 V DC source for individual equipment or small field-side loops.

Question: Why is the power dissipation 2.5 W when my load is small?

Answer: The 2.5 W figure represents the internal conversion losses under typical operating conditions, which is standard for efficient regulated switching power supplies of this class.

Question: Does the electronic short-circuit protection require a manual reset?

Answer: No, the protection is self-resetting; once the short-circuit is removed, the device will automatically resume its normal 24 V DC output.

Question: How do I calculate if this unit can power my entire rack?

Answer: Sum the "Power Consumption" ratings of all individual barriers to be connected to the Power Rail; if the total is less than 500 mA (keeping a 10% safety margin), this supply is sufficient.

Question: Is there an LED indicator to confirm the output is active?

Answer: Yes, the unit is equipped with a front-facing LED that provides immediate visual confirmation of proper power output and system status.

Procurement Advisory

• Load Budgeting: When designing your control panel, ensure that the cumulative draw of your barriers does not exceed 450 mA to prevent thermal triggering of the power supply.
• Fusing: Always install a recommended back-up fuse (B-characteristic 6A to 16A) on the AC input side to protect the module against primary-side surges.
• Mounting: Ensure proper vertical orientation on the DIN rail to allow for natural convection cooling, as this is essential for maintaining the 12-month performance life.

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