Siemens Reyrolle 7SR120 Directional Overcurrent and Earth-Fault Protection Relay

Siemens Reyrolle 7SR120 Directional Overcurrent and Earth-Fault Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens Reyrolle 7SR120 Directional Overcurrent and Earth-Fault Protection Relays in India. We handle requirements for existing protection panels, relay replacement, switchgear retrofit and industrial substation maintenance.

The Siemens Reyrolle 7SR120 is a numerical protection relay used for feeders where fault current may flow in more than one direction. It is commonly found in ring distribution networks, parallel feeders, interconnected systems and electrical networks connected to generators or other power sources.

The relay uses current and voltage inputs to identify both the fault and its direction. This helps the protection system disconnect the affected feeder while keeping healthy sections of the network in service, subject to the approved protection scheme and relay settings.

Along with directional overcurrent and earth-fault protection, the 7SR120 can provide voltage, frequency, breaker supervision, measurement and fault-recording functions. Different versions were supplied with varying binary inputs, output contacts, auxiliary voltages and communication options.

The Reyrolle 7SR120 range entered product phase-out on September 30, 2025. Siemens identifies the Reyrolle 5 7SR5111 as the successor for applicable configurations. Existing 7SR120 enquiries can still be checked against available sourcing options, while new projects should normally be reviewed against the current 7SR51 range.

Buyers looking for a Siemens Reyrolle 7SR120 replacement relay, a directional feeder protection relay or a 7SR5111 successor model can share the complete part number for price and export availability.

Technical Specifications

• Brand: Siemens
• Product family: Reyrolle Argus
• Series: 7SR120
• Product type: Numerical directional overcurrent and earth-fault protection relay
• Main use: Feeder protection in ring, parallel and interconnected networks
• Protection direction: Directional
• Current input options: One or four CT inputs, depending on the model
• CT secondary rating: 1 A or 5 A
• Voltage inputs: Three VT inputs
• Rated frequency: 50/60 Hz
• Binary inputs and outputs depend on the ordered configuration
• Protection curves: Definite-time, IEC and ANSI inverse-time characteristics
• Display: Front LCD
• Indication: Fixed and programmable LEDs
• Local communication: Front USB
• Remote communication: RS485 on applicable versions
• Serial protocols: IEC 60870-5-103, Modbus RTU and DNP3, depending on the model
• Ethernet options: Electrical or optical Ethernet on selected versions
• IEC 61850: Available on applicable configurations
• Setting groups: Multiple setting groups
• Configuration software: Siemens Reydisp
• Recording functions: Fault, event and waveform recording
• Control functions: Circuit-breaker control and supervision
• Product status: Phased out as of September 30, 2025
• Applicable successor: Siemens Reyrolle 5 7SR5111

The exact CT inputs, auxiliary voltage, binary contacts and communication ports depend on the complete Siemens ordering code.

Main Protection Functions

• Depending on the selected 7SR120 model, the relay can provide:
• Directional phase overcurrent protection
• Directional earth-fault protection
• Sensitive earth-fault protection
• Instantaneous and time-delayed overcurrent protection
• Undervoltage and overvoltage protection
• Frequency protection
• Thermal overload protection
• Negative-phase-sequence protection
• Broken-conductor detection
• Circuit-breaker failure protection
• Trip- and close-circuit supervision
• CT and VT supervision
• Cold-load pickup
• Automatic reclosing on applicable versions

The protection functions vary between article numbers. The existing relay settings and panel scheme should be checked before selecting a replacement.

Features

• Directional overcurrent and earth-fault protection in one relay
• Suitable for networks supplied from more than one direction
• Commonly used in ring and parallel feeder systems
• Supports 1 A and 5 A CT secondary circuits
• Current and voltage inputs allow fault-direction measurement
• IEC and ANSI curves support protection coordination
• Sensitive earth-fault options cover lower ground-fault currents
• Voltage and frequency functions are available within the relay
• Multiple setting groups support changing network arrangements
• Circuit-breaker control and supervision are available
• LCD shows measurements, alarms and trip information
• Programmable LEDs provide a clear local indication
• Fault and waveform records assist with trip investigation
• USB and RS485 support local and remote access
• IEC 61850 versions were available for substation automation projects
• Suitable for relay replacement and protection-panel retrofit work

Applications

• Siemens Reyrolle 7SR120 relays are commonly found in:
• Ring distribution networks
• Parallel feeder systems
• Interconnected medium-voltage networks
• Incoming and outgoing switchgear panels
• Industrial substations
• Utility distribution substations
• Captive power plants
• Generator-connected electrical networks
• Solar and wind power substations
• Cable feeder protection
• Overhead feeder protection
• Transformer backup protection
• Oil and gas facilities
• Refineries and petrochemical plants
• Steel and cement plant switchgear
• Mining and mineral-processing facilities
• Water and wastewater plants
• Railway and infrastructure power networks
• Existing protection-panel maintenance
• Directional relay replacement projects

This page covers commercial searches such as Siemens Reyrolle 7SR120 supplier in India, 7SR120 directional relay exporter, Siemens 7SR120 replacement relay and Reyrolle 7SR5111 successor for 7SR120.

Siemens Reyrolle 7SR120 Replacement

The 7SR120 cannot be replaced only by matching the description “directional overcurrent relay.” Hardware, wiring and communication arrangements can vary significantly between models.

For replacement selection, check:

• Complete the existing 7SR120 part number
• CT and VT ratios
• CT secondary current
• Auxiliary supply voltage
• Number of binary inputs and outputs
• Sensitive earth-fault requirement
• Circuit-breaker control arrangement
• Automatic reclosing requirement
• RS485 or IEC 61850 communication
• Electrical or optical Ethernet interface
• Existing panel cut-out and terminals
• Relay setting and logic files

Siemens lists the Reyrolle 5 7SR5111 as the successor for applicable 7SR120 configurations. However, the replacement may require setting conversion, terminal changes or panel modifications.

A clear photograph of the existing relay nameplate, rear terminals and wiring diagram can help identify the closest current replacement.

Siemens Reyrolle 7SR120 Supplier and Exporter in India

ARP IMPEX handles Siemens Reyrolle 7SR120 requirements for switchgear manufacturers, EPC contractors, panel builders, utilities and industrial maintenance companies.

Our supply enquiries include:

• Siemens Reyrolle 7SR120 directional relays
• Phased-out 7SR120 replacement requirements
• Reyrolle 7SR5111 successor relays
• Directional overcurrent and earth-fault relays
• Feeder protection relays for ring networks
• Siemens relays with RS485 communication
• Protection relays with IEC 61850
• Medium-voltage protection-panel retrofit requirements

Availability of an old 7SR120 relay depends on the exact article number and sourcing position. Where the existing model is unavailable, the requirement can be reviewed against an applicable 7SR5111 configuration.

Send the complete Siemens part number, relay photographs, technical details, quantity and destination country for price and export quotation.