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GE 12HFA51A42H | Auxiliary Relay | 125VDC.Here are some key points about auxiliary relays:

They are commonly used in industrial applications, such as power distribution systems, motor control circuits, and process control systems.

They can be used to provide additional contacts for switching higher currents or voltages than the control circuit can handle directly.

They can be used to provide isolation between different circuits, allowing for safer operation and troubleshooting.

They can be used to perform specific functions, such as time delay, sequencing, or logic operations.

They are typically controlled by a separate control circuit, which can be a manual switch, a PLC (Programmable Logic Controller), or other control devices.