Technical Overview

The UR-4LH is a high-density Digital I/O expansion module specifically engineered for the GE Multilin Universal Relay (UR) platform. This module is a critical component for power system protection, providing the physical interface between the relay's microprocessor logic and external switchgear or control circuits. The UR-4LH is distinguished by its high-capacity output count and the use of Form A latchable relays. These latching outputs are essential for "fail-set" applications, where the contact state must be maintained during a loss of control power or to signal persistent lockout conditions in industrial and utility-grade protection schemes.

Detailed Technical Specifications

The following parameters define the hardware architecture and electrical capabilities of the UR-4LH:

• Manufacturer: GE Multilin (General Electric)

• Module Type: Digital Input/Output Module

• System Series Compatibility: GE Universal Relay (UR) Family (e.g., G60, L90, F60, B30)

• Output Configuration: 14 Independent Outputs

• Contact Form: Form A (Normally Open) Latchable

• Functionality: Pulse or Latched operation via software configuration

• Mounting: Modular "Plug-and-Play" design for UR chassis slots

• Isolation: High-dielectric isolation between output contacts and internal logic

• Operating Environment: Designed for substation-hardened environments (EMI/RFI resistant)

• Typical Application: Trip outputs, lockout functions, and status signaling

Operational Logic and Protection Role

The UR-4LH utilizes latching relay technology to provide superior reliability in vibration-prone environments and critical safety circuits. Unlike standard non-latching relays that return to a default state upon power loss, the latchable outputs on the UR-4LH require a deliberate electrical pulse to change state, ensuring that critical protection flags remain active until manually or logically reset. When integrated into the GE Multilin UR series, this module is typically used for high-speed tripping or as part of a complex programmable logic scheme (FlexLogic) to manage breaker control and interlocking.

Technical FAQ

What is the benefit of "Form A Latchable" outputs in the UR-4LH? Form A latchable outputs provide a secure mechanical "memory" of a relay's state. This is vital for lockout applications (86 device functions) where a system must remain in a safe, tripped state even if the protective relay loses auxiliary power.

Can the UR-4LH be installed in any slot of a GE Universal Relay? The UR-4LH is compatible with the standard I/O slots of any UR-series chassis (slots F through M, depending on the specific relay model). Always verify the chassis power supply capacity when adding high-density I/O modules to an existing configuration.

How are the outputs on the UR-4LH configured? Output behavior—such as duration of the latching pulse or conditions for reset—is managed through the GE EnerVista UR Setup software. This allows engineers to map the 14 physical outputs to any internal protection element or logic gate.

SEO Title

GE Multilin UR-4LH | Universal Relay | Digital I/O Module

Product Type

Digital I/O Module

Product Tags

GE Multilin, Universal Relay, UR Series, Digital I/O, Latchable Output, Protection Relay, Form A Relay

SEO Meta Description

GE Multilin UR-4LH Digital I/O Module for Universal Relay systems. 14 Form A latchable outputs for critical protection & control. Genuine GE spares in stock.