UR4DH General Electric Multilin Digital I/O Module

Overview

The UR-4DH is a Digital Input/Output (I/O) module used in the GE Multilin Universal Relay (UR) series. It is designed for substation protection, control, and automation systems, where it expands the relay’s ability to receive status signals and control external equipment.

It acts as an interface between the relay and field devices such as breakers, switches, alarms,

and auxiliary control circuits.

FAQ about  UR4DH

1. What is the UR-4DH used for?

It is used to expand digital input and output capability in GE UR relays for monitoring and controlling field devices.

2. What is the difference between inputs and outputs?

• Inputs: Receive signals (e.g., breaker open/close status)
• Outputs: Send commands (e.g., trip breaker, alarm activation)

3. Is the UR-4DH a standalone device?

No. It only works as part of a GE Multilin UR relay system.

4. Can it be replaced while system is running?

In many UR systems, it is hot-swappable, but this depends on:

• Relay model
• System configuration
• Safety procedures in place