Technical Specifications

FAQ

1. What is the main function of the GE UR 1HH power supply module?
The GE UR 1HH is a high-voltage power supply module designed for GE Multilin Universal Relay systems. Its primary function is to convert the available AC or DC control power into the internal power required by the relay electronics and associated circuits. The module supports 100–240 VAC at 50/60 Hz as well as 125–250 VDC, making it suitable for a wide range of substation and industrial control power systems. Because the power supply is an essential part of the relay architecture, stable operation of the UR 1HH is important for maintaining reliable protection, control, monitoring and communication functions within the complete Universal Relay.

2. What input voltage does the UR 1HH support?
The UR 1HH is the high-voltage power supply version for the GE Multilin UR family. Its AC input range is 100–240 VAC at 50/60 Hz, while the DC input range is 125–250 VDC. The module is therefore suitable for protection and control systems using either AC or DC station power within these ranges. The actual supply voltage at the installation site should be verified before energizing the module. Applying a voltage outside the specified range can result in improper operation or damage. When replacing an existing power supply, technicians should also verify that the replacement module is the same voltage class and compatible with the generation and configuration of the existing UR relay.

3. What is the power rating of the GE UR 1HH?
The UR 1HH has a nominal power rating of approximately 35 VA for its AC input configuration and 35 W for its DC input configuration. This high-power supply module is intended to provide the electrical power required by compatible GE Multilin Universal Relay systems. The actual power demand of a complete relay depends on its CPU, I/O modules, communication interfaces, display and other installed options. Therefore, the module rating should not be interpreted as the exact continuous consumption of every UR relay configuration. During system design or replacement, the station power supply and protection of the complete relay should be evaluated to ensure that adequate voltage, current capacity and circuit protection are available.

4. Which GE Multilin relay systems are compatible with the UR 1HH?
The UR 1HH is designed for the GE Multilin Universal Relay family and is used as a high-voltage power supply module within compatible UR-series relay assemblies. The Universal Relay platform uses a modular architecture in which power supplies, CPUs, I/O modules and communication modules can be configured according to the application. When selecting a replacement UR 1HH, it is important to verify the complete relay model, existing power-supply configuration and module generation. Not every UR power supply has the same voltage range or hardware configuration. The low-voltage power supply option, for example, is intended for 24–48 VDC applications and should not be treated as an interchangeable substitute for the high-voltage UR 1HH without confirming system compatibility.

5. How should a UR 1HH power supply module be replaced?
Replacement should be performed with the relay control power removed and according to the applicable GE Multilin maintenance procedure. Before removing the original module, record the module identification, installation position and associated wiring. Confirm that the replacement unit has the correct UR 1HH designation and matching voltage class. After isolating the power supply, disconnect the module connections and release the appropriate retaining mechanism before removing the module from its slot. The replacement should be inserted into the same designated position and secured correctly. After installation, reconnect the wiring, verify polarity and terminal arrangement where applicable, and restore power. The relay should then be checked for normal startup, diagnostic status, communication and protection-system operation.

6. What are common symptoms of a faulty UR 1HH?
A failing power supply module can cause a wide range of system-level symptoms because the UR 1HH provides power to the relay electronics. Possible indications include failure of the relay to start, unexpected resets, loss of display or communication, abnormal diagnostic messages, intermittent operation or loss of certain relay functions. Before concluding that the UR 1HH has failed, the incoming AC or DC control power should be measured and checked for stability. External fuses, circuit breakers, terminals and wiring should also be inspected. If the input supply is correct but the relay continues to experience power-related problems, the UR 1HH and associated internal connections should be investigated. Diagnostic information from the relay can help distinguish a power supply problem from a CPU, I/O or communication fault.

7. What precautions should be taken when handling the UR 1HH?
The UR 1HH should be handled as an electronic power-supply module, with appropriate electrical isolation and electrostatic discharge precautions. Control power should be removed before physically removing or installing the module unless a specific approved maintenance procedure states otherwise. Working on an energized relay can create risks of equipment damage, unintended operation and personnel injury. Technicians should also use appropriate ESD protection when handling the module and avoid touching exposed electronic components unnecessarily. The replacement module should be installed only in the correct slot and should match the original voltage class. After installation, all connections should be checked carefully before power is restored and the relay is returned to service.

8. How does the UR 1HH contribute to reliable relay protection and control?
The UR 1HH provides the electrical foundation required for the compatible Multilin Universal Relay to perform its protection, control, monitoring and communication functions. A stable internal power supply allows the relay’s CPU, I/O circuits, measurement functions and communication interfaces to operate consistently. In substations and industrial power systems, the relay may be responsible for detecting abnormal electrical conditions and initiating protective actions, so reliable power delivery is essential. The UR platform uses a modular design that makes power-supply replacement and system maintenance more straightforward. For critical protection applications, maintaining a correctly matched spare UR 1HH and periodically checking the relay’s power-related diagnostics can help reduce restoration time when a power-supply problem occurs.