SEL-501 Dual Universal Overcurrent Relay

The SEL-501 Dual Universal Overcurrent Relay provides two complete and independent groups of protection functions in one compact unit. The unit contains Relay X and Relay Y, each having separate optoisolated inputs, output contacts, and three-phase current inputs.

Front- and Rear-Panel Diagrams

Front		Rear

Protection for Feeders, Buses, Transformers, Motors, and Breakers

Use preconfigured applications settings to simplify system instal-lation. The SELAdaptive Overcurrent Element provides high-speed operation, even in cases with severe CT saturation.

Patented Motor Thermal Modeling

Set using basic motor nameplate data to quickly implement complete thermal motor protection.

Control System

IntegrationInterconnect with automated control networks using the Modbus®RTU protocol. Select either an EIA-232 or EIA-485 serial communications port.

Easy Connections

Select either terminal block or plug-in Connectorized® terminations to speed up panel installation.

Field-Proven Hardware

Install the SEL-501 in a control house or outdoor enclosure with a wide operating temperature range (—40° to +85°C) for increased reliability.

Dual Relay Concept

The SEL-501 Dual Universal Overcurrent Relay provides two complete and independent groups of protection functions in one compact unit. The unit contains Relay X and Relay Y, each having separate optoisolated inputs, output contacts, and three-phase current inputs.

Application

Breaker Failure Protection
(Setting Option Bfr)