Schneider ASP120125 Power Supply

The Schneider ASP120125 delivers 24 VDC power for Modicon PLC and I/O systems. This compact power supply mounts directly on a DIN rail. You will find it in control cabinets with limited panel space. It provides 125 watts of continuous output for multiple devices. Therefore, this unit powers CPUs, I/O modules, and field sensors reliably.

This module measures 125 mm in height and 55 mm in width. Its depth reaches 110 mm for DIN rail mounting. The unit weighs approximately 0.75 kilograms. It contains one main transformer and eight electrolytic capacitors. Four bridge rectifiers convert AC to DC efficiently. Additionally, you get three status LEDs for diagnostics.

Key Technical Specifications

Parameter	Value
Manufacturer	Schneider Electric
Model	ASP120125
Product Type	Power Supply Module
Input Voltage	100-240 VAC (50/60 Hz)
Input Current	2.0 A maximum
Output Voltage	24 VDC
Output Power	125 W
Output Current	5.2 A
Efficiency	88% typical
Hold-up Time	25 ms at full load
Height	125 mm
Width	55 mm
Depth	110 mm
Weight	0.75 kg
Transformer Count	1 (main)
Capacitors	8 (electrolytic)
Bridge Rectifiers	4
Energy Storage	≈ 2200 µF
Status LEDs	3 (PWR, OK, OVLD)
Protection	Overvoltage, short circuit, overtemp
Operating Temperature	-20°C to +70°C

Internal Architecture and Energy Storage

The Schneider ASP120125 stores substantial energy in its capacitor bank. Eight electrolytic capacitors hold approximately 2200 microfarads of total capacitance. This storage allows the supply to ride through 25 ms AC line drops. A switching regulator operates at 100 kHz for high efficiency. The main transformer provides 3000 VAC isolation between input and output. An optocoupler feeds back output voltage for precise regulation. The module includes automatic over-temperature shutdown protection. A green OK LED confirms normal output voltage status. A red OVLD LED indicates overload or short circuit condition.

Connection Interfaces and Wiring Details

You will find a 4-terminal AC input block on the top panel. Connect the live wire to L and neutral to N. Connect the protective earth wire to the PE terminal. Use 14 AWG copper wire for all AC power connections. The Schneider ASP120125 also includes a 4-terminal DC output block. Two terminals provide +24 VDC and two provide 0 V return. Three LEDs show input power, output OK, and overload status. The unit automatically resets after removing an overload condition. A built-in potentiometer allows fine output voltage adjustment from 22.8 to 25.2 VDC.

Installation and Mounting Steps

You mount this power supply onto standard 35 mm DIN rail. First, hook the top clip onto the rail edge securely. Then, press the bottom downward until it clicks into place. Slide the unit along the rail for easy panel layout. Connect the AC input wires to the proper terminals. The Schneider ASP120125 automatically detects 100-240 VAC input. No voltage selector switch requires manual setting. Leave 50 mm of free space above and below for cooling. Connect the +24 VDC output to your PLC backplane. Connect the return wire to the 0 V terminal. Power on the unit and verify the green OK LED before connecting loads.