GE Multilin UR SHH Retrofit-Compatible Control Module for Legacy UR Series

GE Multilin UR SHH Retrofit-Compatible Control Module for Legacy UR Series

The GE Multilin UR SHH is a control module designed for the Universal Relay (UR) platform — one of the most widely deployed digital protection relay families in transmission, distribution, and industrial power systems. As aging UR Series installations approach end-of-support cycles, the UR SHH plays a critical role in extending operational life, enabling smooth hardware refresh cycles, and supporting migration from discontinued relay firmware and backplane configurations without requiring full panel redesign.

For maintenance engineers and system integrators managing legacy protection schemes, the UR SHH provides a reliable, tested replacement path that preserves existing wiring, terminal assignments, and communication architecture. Whether you are replacing a failed module in a live substation, upgrading a control cabinet during a planned outage, or sourcing long-lead spare parts for a lifecycle extension program, the UR SHH is a field-proven solution backed by a 12-month warranty and pre-shipment functional testing.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Replacing the UR SHH within an operational protection relay panel requires careful pre-work to avoid unplanned outages and configuration loss. Before initiating the swap, engineers should retrieve and archive the existing relay settings file using EnerVista UR Setup software. This ensures that all protection elements, logic equations, and communication parameters can be restored to the replacement module without manual re-entry.

The UR SHH interfaces directly with the UR Series backplane, which means the power supply module — typically a GE Multilin UR PSU — must be verified for adequate capacity before the new module is seated. In installations where multiple modules share a single chassis, such as configurations combining a GE Multilin UR CPU, UR DSP, and one or more UR I/O modules (analog or digital), the total backplane load must remain within rated limits.

For sites running IEC 61850 GOOSE messaging or DNP3 over Ethernet, the GE Multilin UR COM communications module settings should be reviewed alongside the SHH replacement to confirm that MAC addresses, IP configurations, and IED naming conventions are preserved. In substations where the UR relay communicates with a SCADA master or RTU via Modbus RTU over RS-485, the serial port parameters on the replacement module must match the original configuration exactly to avoid communication loss after restart.

Panel integrators working on control cabinet upgrades should also account for the HMI display interface. The UR SHH provides the front-panel LCD and keypad interface for local relay interaction. After module replacement, the HMI screen should be verified for correct relay identification, active alarm display, and local/remote control mode status. In multi-relay panels where a GE Multilin UR gateway or substation automation controller aggregates relay data, the communication link to each UR IED should be re-confirmed post-swap.

For I/O-intensive applications — such as transformer differential protection schemes using a GE Multilin T60 or bus protection using a GE Multilin B90 — the UR SHH replacement should be coordinated with a review of the associated UR CT/VT input modules and any signal isolators in the secondary wiring circuit. Verifying that CT shorting links are in place before module removal is a mandatory safety step in live panel environments.

Where the legacy installation includes older UR firmware revisions that are no longer supported by GE Grid Solutions, the UR SHH replacement may be an appropriate trigger point to evaluate a broader firmware upgrade. Coordinate with your relay settings engineer to assess whether the existing logic files are compatible with the firmware version shipped on the replacement module, and plan a settings migration if required.

Downtime Control During System Migration

Minimizing downtime during UR SHH replacement begins with a structured pre-outage checklist. Before the protection relay is taken out of service, the following steps should be completed: archive the relay settings file, document all active alarms and event records, photograph or diagram the existing terminal wiring, and confirm that backup protection is in service for the circuit being maintained.

The UR SHH module is a hot-swap-capable component within the UR chassis in most configurations, but site-specific safety rules and utility operating procedures must always take precedence. In installations where the relay provides primary protection for a critical feeder or transformer, a formal switching order should be issued before any module is removed.

Once the replacement UR SHH is seated and the relay has completed its self-test sequence, the settings file should be uploaded immediately using EnerVista UR Setup. Communication links — including IEC 61850 GOOSE subscriptions, DNP3 polling, and any hardwired binary inputs from the UR digital I/O module — should be verified before the relay is returned to service. A staged functional test, including trip output verification and HMI alarm acknowledgment, is recommended before the outage window is closed.

For planned maintenance windows, coordinating the UR SHH replacement with adjacent tasks — such as testing the GE Multilin UR PSU backup power path, inspecting backplane connector pins, and cleaning chassis ventilation — maximizes the value of each outage and reduces the frequency of future interventions. Stocking a spare UR SHH module as part of a site-level critical spares program is strongly recommended for installations where relay availability is essential to grid reliability.

Retrofit Support FAQ

Q1: Is the UR SHH a direct drop-in replacement for the original GE Multilin UR control module?
Yes. The UR SHH is designed to fit the standard UR Series chassis slot and interfaces with the existing backplane without panel modification. The relay settings file from the original module can be uploaded directly to the replacement unit using EnerVista UR Setup software, preserving all protection logic and communication parameters.

Q2: What commissioning steps are required after installing the UR SHH?
After seating the module and completing the relay self-test, upload the archived settings file, verify HMI display functionality, confirm communication link status (IEC 61850, DNP3, or Modbus as applicable), and perform a trip output test. For sites with SCADA integration, confirm that the relay is visible and reporting correctly to the master station before returning to service.

Q3: Has the UR SHH been tested before shipment?
Yes. Every UR SHH unit supplied by NINERMAS undergoes pre-shipment functional testing to verify module integrity and basic operational status. A 12-month warranty is included, covering manufacturing defects from the date of delivery.

Q4: Can NINERMAS support long-term supply of UR SHH modules for lifecycle extension programs?
Yes. NINERMAS maintains inventory of GE Multilin UR Series spare parts to support long-term lifecycle programs for utilities, industrial plants, and EPC contractors. Bulk order commitments and fixed lead-time agreements are available. Contact our team to discuss stocking arrangements aligned with your maintenance schedule.