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.