Reyrolle 7SR105 Siemens Motor Protection Relay

Reyrolle 7SR105 Rho Siemens Motor Protection Relay is a numerical protection relay intended for use in 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 Reyrolle 7SR105 platform is a compact motor protection relay in a Non draw out case with 6BI/Os, Serial interface, RTD inputs with Current based motor protection algorithms – simplest and comprehensive motor protection relay.The device is housed in a 4U high, size 4 non drawn-out 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.

Contact us


  • Optional RTD inputs
  • Cold Load Settings
  • Two Settings Groups
  • Password Protection
  • Self Monitoring
  • Circuit Breaker Trip Counter
  • Fault, event and waveform records


  • Motor protection and control for a variety of drives
  • Application-specific standard configurations resulting in a shorter relay setup and commissioning time
  • Preconfigured solutions for utility distribution and industrial applications



Product Family

(Auxiliary powered)

Motor Protection Relay
Case and LEDs Non Draw-out Polycarbonate case (Size 4 standard, Non Draw-out design), 10 LEDs
Measuring Inputs


1 A/5 A, 50 Hz/60 Hz
Auxiliary Voltage 60 V – 240 V AC/DC

24 V – 60 V DC

Communication Default front communication port (IEC 60870-5-103 or MODBUS RTU)

Rear port: RS485 (optional – IEC 60870-5-103 or Modbus RTU or DNP 3.0)

Protection Functions 14, 37, 48/66, 50, 50G/N, 51, 51G/N, 49, 46
Supervision and control functions 74 T/CCS, 86, 50 BCL, 81 B, 46 Ph Rev, 50BF, TEMP
Binary Input and Binary Output 6 BI and 6 BO (2 changeover contact) Threshold voltage

–  44 V AC/DC with 60 V – 240 V AC/DC power supply version

–  19 V DC with 24 V – 60 V DC power supply version

Temperature Inputs 6 inputs

Measuring Range -50ºC to +250ºC


Design Flush mounting, Non Draw-out Polycarbonate moulded case
Enclosure IP 54 (front panel)

IP 20 Protection for terminals (rear side) Depth is 199 mm

Weight 1.6 kgs (appx)


Current Inputs 12 position (Terminal X5), M4 Screw-type Barrier Terminal block suitable for 2.5 mm2/4 mm2 cable
Auxiliary Supply 3 position (Terminal X3), M3 screw-type plug-in terminals suitable for

2.5 mm2 cable

Rear Communication Port 4 position (Terminal X2), M2 screw-type plug-in terminals suitable for

1.5 mm2 cable

Front Communication Port USB, Type B
Binary Input 6 or 12 position (Terminal X1), M3 screw-type plug-in terminals suitable for 2.5 mm2 cable
Binary Output 8 or 14 position (Terminal X4), M3 screw-type plug-in terminals suitable for 2.5 mm2 cable
Temperature Inputs 18 position (Terminal X6, X7), M2 screw-type plug-in terminals suitable for 1.5 mm2 shielded cable