Schneider A020/E/24V/GL | Control Unit Power Supply Logic Board

The Schneider A020/E/24V/GL combines power regulation and logic control on a single board. This control unit converts AC line voltage into stable 24 VDC for internal circuits. You can find this module inside specific Schneider PLC racks and power supplies. The unit manages both voltage conversion and basic I/O signal processing.

Power and Electrical Specifications

Parameter	Specification
Brand	Schneider Electric
Model	A020/E/24V/GL
Product Type	Control Unit (Power + Logic)
Input Voltage	100 to 240 VAC (47-63 Hz)
Output Voltage	24 VDC nominal
Output Current	2.1 A maximum
Output Power	50 W continuous
Efficiency	82% typical
Ripple & Noise	< 50 mV peak-to-peak

The Schneider A020/E/24V/GL accepts worldwide AC input without manual switching. This control unit delivers 2.1 amps at 24 VDC for powering downstream electronics. You can rely on its 82% efficiency for low heat generation. The output ripple stays below 50 mV for sensitive analog circuits.

Physical Dimensions and Weight

Parameter	Specification
Weight	0.28 kg (0.62 lbs)
Length	165 mm
Width	100 mm
Height	35 mm
PCB Layers	2 (FR4 material)
Component Count	156 discrete parts
Mounting Holes	4 (M3 clearance)

This control unit weighs only 0.28 kg for easy handling during replacement. The board measures 165 mm long by 100 mm wide. Its height reaches 35 mm including tallest components. You can mount the Schneider A020/E/24V/GL using four M3 screws.

Connectors and Interface Points

A 20-pin right-angle header connects to the main backplane or motherboard. Two 6-pin Molex connectors handle DC output and status signals. You will also find one 3-pin terminal block for AC input wiring. The board includes a 2-pin connector for external battery backup (optional). All connectors use tin-plated contacts for reliable conductivity.

Energy Storage and Capacitive Bank

The Schneider A020/E/24V/GL stores significant energy for hold-up during brownouts. Three large electrolytic capacitors provide 1,200 µF of total bulk storage. These capacitors maintain 24 VDC output for 25 ms after input power drops. Additionally, 14 ceramic capacitors filter high-frequency switching noise. The board does not contain any battery for long-term memory retention.

Internal Components and Circuit Layout

A main switching transformer operates at 65 kHz for power conversion. The primary side includes a power MOSFET and PWM controller IC. You will find 32 resistors, 28 capacitors, and 6 diodes on the board. Four optocouplers provide feedback isolation between primary and secondary circuits. The Schneider A020/E/24V/GL also includes a slow-blow fuse (2.5 A, 250 V).

Regulation and Protection Features

This control unit includes overcurrent protection at 2.8 A typical. The device also features short-circuit protection with automatic retry. An overtemperature sensor shuts down the unit at 85°C internal temperature. The output includes a crowbar circuit for overvoltage protection at 28 VDC. Transitioning to this control unit restores power and logic functions simultaneously. For best results, verify all four mounting screws are tight before operation.