Siemens 6EP1437-2BA20 SITOP PSU300S Power Supply 3AC 400-500V 24VDC 40A

The Siemens 6EP1437-2BA20 is a SITOP PSU300S stabilized DIN-rail power supply with 3-phase 400-500 V AC wide-range input and regulated 24 V DC / 40 A output (960 W continuous). Provides soft-start without output voltage overshoot, adjustable 24-28 V output via potentiometer, and "24 V OK" signaling via a green LED plus relay contact.

Technical specifications:

• Order number (MLFB): 6EP1437-2BA20
• Manufacturer: Siemens
• Product line: SITOP PSU300S
• Input voltage: 3-phase AC, 400-500 V rated (range 340-550 V)
• Line frequency: 50/60 Hz (47-63 Hz)
• Input current: 2 A @ 400 V; 1.7 A @ 500 V
• Inrush current limitation @ 25 °C: max 60 A
• Wide-range input: Yes
• Buffering time at rated output (V_in = 400 V): min 6 ms
• Recommended feeder fuse: 3-pole MCB 10-16 A C-characteristic, or 3RV2011-1DA10 set to 3 A, or 3RV2711-1DD10 (UL 489)
• Output voltage: 24 V DC (rated), adjustable 24-28 V via potentiometer (max 960 W)
• Output current: 40 A rated; 48 A up to +45 °C; derating 3%/K from +60 to +70 °C
• Active power supplied: typical 960 W
• Output voltage tolerance: 3 % overall
• Control precision (slow input fluctuation): 1 %
• Control precision (slow load fluctuation): 2 %
• Residual ripple: max 150 mV
• Voltage peak: max 240 mV
• Response delay: max 1.5 s
• Voltage rise time: 15 ms typical, 500 ms max
• Status: Green LED "24 V OK" + relay NO contact (60 V DC / 0.3 A)
• Soft-start: No Vout overshoot at power-on
• Isolation: Controlled, isolated DC output

Features and benefits:

• Wide-range 3-phase 400-500 V input - usable globally without input setting changes
• Soft-start - no overshoot at power-on, protects sensitive electronics downstream
• "24 V OK" signaling - integrate health monitoring into PLC inputs via the NO relay contact
• Adjustable 24-28 V - compensate voltage drop on long cable runs without external boosters
• Up to 48 A overload up to +45 °C - tolerates inrush from inductive loads
• Mains buffering >= 6 ms - rides through brief input dips without output collapse

Applications:

• 24 V DC supply for industrial control panels, PLCs and field devices
• Machine builder applications with 3-phase 400/480 V infeed
• Distributed I/O and remote stations needing reliable 24 V DC up to ~38 A continuous
• Plants requiring soft-start power supplies for sensitive electronics

Also known as: Siemens 6EP1437-2BA20, SITOP PSU300S 3AC 24V 40A, SITOP 40A 3-phase 24V power supply, Siemens DIN rail PSU 24V 960W.