GE A20B-0005-0450/04B Power Supply PCB

The GE A20B-0005-0450/04B provides regulated DC power to CNC control components. This power supply PCB measures 220 mm in width and 160 mm in height. It has a depth of 40 mm, so it fits standard CNC card racks easily. The unit weighs 0.75 kg, making replacement straightforward.

Input Specifications and Energy Storage

You must supply 200V AC to 240V AC single-phase power to this PCB. The GE A20B-0005-0450/04B accepts a voltage tolerance of ±10 percent from nominal values. It operates on 50 Hz or 60 Hz line frequency without adjustment. The board stores 1500 µF of capacitance across its primary DC bus. This storage rides through input interruptions lasting up to 20 milliseconds.

Output Ratings and Voltage Rails

The GE A20B-0005-0450/04B delivers multiple DC voltage rails for CNC modules. It provides +5V DC at 8 amps for logic circuits and processor boards. The PCB supplies +24V DC at 4 amps for I/O and sensor power. A dedicated +15V DC rail delivers 2 amps for analog circuits. A -15V DC rail provides 1.5 amps for operational amplifiers.

Protection Features and Monitoring

The power supply includes overvoltage protection on every output rail. The GE A20B-0005-0450/04B features short-circuit protection with automatic current limiting. A thermal sensor shuts down the board if internal temperatures exceed safe limits. LED indicators show the status of each DC output rail clearly. A relay contact provides remote monitoring of power supply health.

Internal Architecture and Cooling

The PCB contains four separate circuit layers with surface-mount components. The GE A20B-0005-0450/04B uses natural convection cooling without any fan. A metal heat sink attaches to the main switching transistors. The board stores 330 µF of secondary capacitance for output filtering. A 50-pin edge connector interfaces with the CNC backplane.

Below is a complete summary of its technical specifications.

Parameter	Value
Dimensions (W x H x D)	220 mm x 160 mm x 40 mm
Weight	0.75 kg
Input Voltage	200-240V AC single-phase ±10%
Input Frequency	50/60 Hz
Primary Capacitance	1500 µF
Hold-up Time	20 ms
+5V DC Output	8 A
+24V DC Output	4 A
+15V DC Output	2 A
-15V DC Output	1.5 A
Secondary Capacitance	330 µF
Overvoltage Protection	Yes (all outputs)
Short-circuit Protection	Current limiting
Thermal Protection	Shutdown
Cooling Method	Natural convection with heat sink
Number of Circuit Layers	4
Edge Connector	50-pin
Status LEDs	Per output rail
Monitoring Output	Relay contact

The GE A20B-0005-0450/04B replaces older power supply boards in GE CNC systems. You do not need any adapters or additional mounting hardware. This board also provides clean DC power for sensitive analog circuits. Consequently, it ensures reliable operation for machining center controls.