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Multilin 735 / 737

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.


Manufacturing for this product has been discontinued. As an alternative, please refer to the Multilin 350 or Multilin 850.


Protection & Control

  • 3 phase time overcurrent

  • Ground time overcurrent

  • 5 curve shapes

  • 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


Monitoring and Metering

  • Trip record of last 5 trips

  • Pre-trip data includes currents

  • True RMS sensing

  • User Interface

  • 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


8 Series Retrofit Kit


Explore the 8 Series Retrofit Kit

Retrofit Existing SR 735 Devices to the Multilin 850 in Minutes

Traditionally, retrofitting an existing relay has been a challenging, time consuming task often requiring re-engineering, new drawings, panel modifications, re-wiring and re-testing.

The 8 Series Retrofit Kit provides a quick, 3-step solution to upgrade previously installed SR 735 relays. With the new 8 Series Retrofit Kit users are able to install the 850 Feeder Management System without modifying existing cutouts and wiring, and without any drawing changes or re-engineering time.

Easy 3-Step Process to Upgrade in as Fast as 21 Minutes


735 / 737 Brochure

735 / 737  Manual

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