Siemens Reyrolle 7SR105 Rho Motor Protection Relay

Siemens Reyrolle 7SR105 Rho Motor Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens Reyrolle 7SR105 Rho Motor Protection Relays in India. We handle requirements for industrial motors, motor control panels, pumping stations, conveying systems, plant maintenance and replacement of existing Reyrolle relays.

The Reyrolle 7SR105 is a compact numerical relay used for current-based protection and control of induction motors. Siemens generally positions this model for industrial motors below 1 MW, where protection depends mainly on current measurement rather than a complete voltage-based motor protection scheme.

The relay monitors the motor during starting and normal operation. It can detect thermal overload, locked rotor, excessive starting time, phase unbalance, phase reversal, short circuit, earth fault and undercurrent conditions. These protections help reduce the risk of motor damage and unexpected production stoppages.

The 7SR105 is commonly selected for pumps, conveyors and other industrial drives where the motor performs an important process duty. It also provides motor start and stop control, electrical measurements, fault records and programmable logic within the same unit.

Standard versions have four current inputs, six binary inputs and six binary outputs. A version with six temperature inputs is also available for applications requiring motor winding or bearing temperature supervision. Communication is through a front USB port and rear RS485 interface, with support for IEC 60870-5-103, Modbus RTU or DNP3, depending on the selected configuration.

Buyers searching for a Siemens Reyrolle 7SR105 supplier in India, a motor protection relay for motors below 1 MW, or a 7SR105 relay with RTD temperature inputs can share the complete Siemens part number for price and availability.

Technical Specifications

• Brand: Siemens
• Product family: Reyrolle Rho
• Series: 7SR105
• Product type: Numerical motor protection relay
• Main use: Current-based protection and control of induction motors
• Typical motor application: Motors below 1 MW
• Current inputs: Four CT inputs
• CT secondary rating: 1 A or 5 A
• Rated frequency: 50/60 Hz
• Binary inputs: Six
• Binary outputs: Six
• Temperature inputs: Six RTD inputs on applicable models
• Auxiliary supply options: 24–60 V DC or 60–240 V AC/DC, depending on the model
• Setting groups: Two
• Display: Four-line front LCD
• Indication: Ten LEDs, including programmable indications
• Local communication: Front USB
• Remote communication: Rear RS485
• Communication protocols: IEC 60870-5-103, Modbus RTU or DNP3
• Configuration software: Siemens Reydisp Evolution
• Control: Motor start and stop control
• Housing: Size 4, non-draw-out, flush-mounting case

These specifications vary with the Siemens MLFB or complete ordering code. The official catalogue lists separate versions with and without six temperature inputs, along with different auxiliary supply ranges.

Main Motor Protection Functions

The Siemens Reyrolle 7SR105 includes the main protections required for current-based motor applications:

• Thermal overload protection
• Locked-rotor and motor-stall protection
• Excessive starting-time supervision
• Number-of-starts supervision
• Phase-current unbalance protection
• Phase-reversal protection
• Instantaneous and time-delayed overcurrent protection
• Measured and calculated earth-fault protection
• Undercurrent or loss-of-load protection
• Anti-backspin monitoring
• Circuit-breaker failure protection
• Trip- and close-circuit supervision
• Temperature supervision on RTD versions
• Protection lockout

Siemens lists these functions as part of the standard 7SR105 platform, with temperature supervision applying to the version fitted with RTD inputs.

Features

• Combines motor protection, monitoring and control in one relay
• Suitable for current-based protection of industrial motors
• Protects the motor during starting and normal running
• The thermal model helps prevent damage from prolonged overloading
• Detects locked rotor and excessive motor starting time
• Controls the permitted number of starts within a set period
• Identifies phase-current unbalance and incorrect phase sequence
• Undercurrent protection can detect loss of load or dry running
• Anti-backspin monitoring helps prevent early motor restarting
• Optional RTD inputs monitor motor winding or bearing temperatures
• Start and stop push buttons support local motor control
• Programmable logic allows the relay to match the panel control scheme
• LCD shows measurements, alarms, settings and trip information
• Fault and event records help investigate motor trips
• Front USB simplifies relay settings and commissioning
• RS485 supports communication with SCADA or plant control systems
• Optional conformal coating is available for difficult industrial environments
• Compact construction suits new motor panels and retrofit projects

Siemens provides the 7SR105 with motor control, data recording, self-monitoring, programmable logic and optional temperature supervision. The catalogue also lists conformal coating as an ordering option for environments affected by humidity, corrosive gases or aggressive dust.

Applications

Siemens Reyrolle 7SR105 Motor Protection Relays are commonly used for:

• Industrial induction motors
• Motors rated below 1 MW
• Water pumps
• Sewage pumping stations
• Water treatment plants
• Wastewater treatment facilities
• Conveyors and conveying systems
• Material-handling equipment
• Industrial fans and blowers
• Process pumps
• Cooling-water pumps
• Mixers and agitators
• Small and medium compressors
• Crushers and processing equipment
• Motor control centres
• Industrial switchgear panels
• Steel and cement plants
• Mining and mineral-processing units
• Chemical processing plants
• Power-plant auxiliary motors
• Existing 7SR105 replacement requirements

Siemens specifically identifies industrial motor protection, pumping stations, water and sewage treatment plants and conveying systems as core applications for the 7SR105.

The relay is suitable for commercial searches such as numerical motor protection relay for water pumps, Siemens motor relay for conveyor systems, 7SR105 relay with six RTD inputs, and current-based motor protection relay for motors below 1 MW.

Selecting the Correct Siemens 7SR105 Relay

The product name “Reyrolle 7SR105” does not identify the complete relay configuration. The exact model depends on the auxiliary supply and whether temperature inputs are required.

For an accurate quotation, share:

• Complete Siemens MLFB or article number
• Motor rated power
• Motor voltage and full-load current
• CT ratio and CT secondary rating
• Motor starting method
• RTD temperature-monitoring requirement
• Auxiliary supply voltage
• Communication protocol
• Required quantity
• Destination country

For replacement enquiries, share clear photographs of the existing relay nameplate and rear terminal arrangement. The nameplate normally shows the ordering code, current rating, frequency, auxiliary supply and serial number.

Siemens Reyrolle 7SR105 Supplier and Exporter in India

ARP IMPEX supplies Siemens Reyrolle 7SR105 Rho Motor Protection Relays for panel builders, EPC contractors, switchgear companies, utilities and industrial maintenance departments.

We handle enquiries for:

• Siemens Reyrolle 7SR105 motor protection relays
• Motor relays with thermal overload protection
• 7SR105 relays with six RTD inputs
• Current-based protection relays for motors below 1 MW
• Motor protection relays for pumps and conveyors
• Reyrolle relays with RS485 communication
• Replacement Siemens 7SR105 relays
• Motor control-panel retrofit requirements