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.
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
Circuit breaker trip counter
Fault, event and waveform records
Stall protection (14)
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)
Circuit breaker fail (50BF)
CT supervision (60CTS)
Trip circuit supervision (74T/CCS)