GE A16B-1212-0950 Power Supply Unit

The GE A16B-1212-0950 delivers stable DC power for CNC system components. This unit converts 200-240 VAC input into multiple DC output voltages. You will find it inside main control cabinets for machine tools. It supplies +5 V, +12 V, -12 V, and +24 V rails. Therefore, this unit powers servo drives, PLCs, and operator interfaces.

This power supply measures 250 mm in height and 185 mm in width. Its depth reaches 170 mm for chassis mounting. The unit weighs approximately 4.2 kilograms. It contains one main transformer and eight electrolytic capacitors. Four bridge rectifiers convert AC to DC for each output rail. Additionally, you get a built-in cooling fan for thermal management.

Key Technical Specifications

Parameter	Value
Manufacturer	GE Fanuc Automation
Model	A16B-1212-0950
Product Type	Power Supply Unit
Input Voltage	200-240 VAC (50/60 Hz)
Output +5 VDC	15 A (maximum)
Output +12 VDC	4 A (maximum)
Output -12 VDC	2 A (maximum)
Output +24 VDC	6 A (maximum)
Total Output Power	250 W
Transformer Count	1 (main)
Capacitors	8 (electrolytic)
Bridge Rectifiers	4
Height	250 mm
Width	185 mm
Depth	170 mm
Weight	4.2 kg
Cooling Method	Internal fan
Energy Storage	≈ 5200 µF
Protection Features	Overvoltage, overcurrent
Operating Temperature	0°C to +50°C

Internal Architecture and Energy Storage

The GE A16B-1212-0950 stores substantial energy in its capacitor bank. Eight electrolytic capacitors hold approximately 5200 microfarads of total capacitance. This storage allows the unit to ride through 30 ms AC line drops. A large toroidal transformer provides magnetic isolation for all outputs. Four bridge rectifiers convert each secondary winding to DC. Linear regulators maintain precise output voltages under varying loads. A thermistor controls the internal fan speed automatically. You get overvoltage protection on every output rail.

Connection Interfaces and Wiring Details

You will find a 5-terminal AC input block on the side panel. Connect L1, L2, and ground wires to these terminals securely. Use 12 AWG copper wire for all AC input connections. The GE A16B-1212-0950 also includes a 24-pin DC output connector. This connector supplies +5 V, +12 V, -12 V, and +24 V to the backplane. Four additional terminals provide isolated +24 V for field devices. Always connect the protective earth terminal before applying power. A green LED indicates normal operation of the power supply.

Installation and Mounting Steps

You mount this power supply onto a flat chassis plate with four screws. First, drill four 5 mm holes matching the mounting pattern. Then, secure the unit using M4 screws with lock washers. Connect the AC input wires to the appropriate terminals. The GE A16B-1212-0950 automatically accepts 200 or 240 VAC. Verify that the voltage selector switch matches your line voltage. Do not block the fan intake or exhaust openings. Leave 60 mm of free space around all sides for airflow. Power on the unit and check all output voltages before connecting loads.