735/737 Feeder Relay

The 735/737 is a microprocessor based relay used to perform primary circuit protection on distribution networks at any voltage level. Protection features include three phase timed overcurrent, phase instantaneous overcurrent, ground timed overcurrent, and ground instantaneous overcurrent. Each protection element can be selectively enabled by the front panel dial settings. Flexible settings and selec-table curve shapes enable accurate coordination with other devices. Installation and maintenance costs are lower when the 735/737 is used instead of the 8 separate overcurrent protection devices it has been designed to replace.

3 phase time overcurrent

Ground time overcurrent

4 curve shift multipliers per curve

10 time multipliers per curve

ANSI, IAC, or IEC/BS142 curves

Phase instantaneous overcurrent

Ground instantaneous overcurrent

Pickup level for each overcurrent

Outputs: trip, aux trip, service

Aux trip: 86 lockout, ground trip

SR737 has 8 additional output relays

Trip record of last 5 trips

Pre-trip data includes currents

8 LED trip indicators

4 LED status indicators

Current bar graph, % of CT

RS485 or RS422 communications

ModBus™ RTU protocol

Baud rate up to 19,200 bps