Feeder Protection

SEL-751A Feeder Protection Relay

Protection, Control, and Automation Capabilities
The SEL-751A is designed to provide powerful and flexible feeder protection in a compact package, including under- and overvoltage, overcurrent, time-overcurrent and frequency elements. Easily implement custom configuration and operation with SELOGIC^® control equations.

Quickly Retrofit Existing Installations
Easily retrofit existing equipment with mounting adapters designed for existing cutouts.

Multiple Communications Protocols and Media Options
The versatile SEL-751A has many communications protocol options, including IEC 61850, Modbus^® RTU, Modbus TCP, DeviceNet™, Telnet, FTP, and MIRRORED BITS^®. Media options include Ethernet 10/100BASE-T, EIA-232, EIA-485, and fiber-optic serial.

Reduce Arc-Flash Hazard
Reduce the danger of explosive arc-flash incidents by reducing the available fault current energy or removing personnel from the danger zone. Coordinate protection for shorter clearing times, enable instantaneous elements while maintenance is being performed, and remain outside the danger zone with wireless or remote communications.

More information on the SEL-751A Feeder Protection Relay

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SEL-351S is shown. SEL-351 is a family of products including:

SEL-351 Directional Overcurrent and Reclosing Relay
SEL-351A Distribution Protection System
SEL-351R Recloser Control
SEL-351S Protection and Breaker Control Relay

* The UL and CSA qualifications do not apply to the SEL-351R, SEL-351J, SEL-351P.

SEL-351 Directional Overcurrent and Reclosing Relay

• Dependable overcurrent protection with sensitive, secure combination of phase, negative-sequence, residual-ground, and neutral-ground overcurrent elements, including directional control, and programmable US and IEC time-current curves for complete distribution system protection.
• Provide primary or backup overcurrent protection on distribution systems with sensitive phase, negative-sequence, residual, and neutral overcurrent protection elements.
• Choose the SEL-351 relay for distribution overcurrent protection with optional load profile recording, MIRRORED BITS communications, and power quality monitoring capabilities.

SEL-501 Dual Universal Overcurrent Relay

• Provide protection for two motors (using the SEL patented thermal model) when RTDs are not required.
• The motor thermal model automatically switches between starting and running conditions, and requires only basic information about the motor.
• Modbus^® RTU and ASCII protocols.
• Multi-cycle event reports, instantaneous metering, and demand metering.

SEL-551 Overcurrent and Reclosing Relay

• Combine overcurrent protection and multiple-shot reclosing in one compact relay.
• Protect distribution feeders, distribution buses, transformers, capacitors, and circuit breakers.
• Phase, negative-sequence, residual ground, and neutral overcurrent protection in a compact package. Complete set of instantaneous, definite-time, and time-overcurrent elements.
• Modbus^® RTU and ASCII protocols.