Motor protection – Reyrolle 7SR105

Motor protection – Reyrolle 7SR105

Product Overview

Reyrolle 7SR105 Rho motor protection relay is a numerical protection relay intended for use in the motor protection applications. It provides a highly comprehensive functional software package with a range of integral application functions aimed at reducing installation, wiring, and engineering time.

Features :

The device is housed in a 4U high, size 4 non-withdrawable case and these relays provide protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging and fault reports. Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical RS485 port for remote connection.

A wide range of measured values can be viewed on the front LCD or remotely via the communications channel. The integrated control feature allows the safe operation of a motor and monitoring its start and stop operations.

  • Optional RTD inputs
  • Cold load settings
  • Two settings groups
  • Password protection
  • Self-monitoring
  • Circuit breaker trip counter
  • Fault, event and waveform records

Functions :

Protection functions

  • Stall protection (14)
  • Undercurrent (37)
  • Current unbalance protection (46)
  • Phase reversal (46Ph Rev)
  • Start protection (48/66)
  • Motor thermal overload (49R)
  • Time-overcurrent protection (50/51)
  • Earth fault (50/51G/N)
  • Backspin protection (81B)
  • Temperature inputs (RTD)

Supervision functions

  • Circuit breaker fail (50BF)
  • CT supervision (60CTS)
  • Trip circuit supervision (74T/CCS)

Monitoring functions

  • Instrumentation

More Information


+66 2 063 5262-3, +66 83 440 1404