Siemens Reyrolle 7SR110 Non-Directional Overcurrent and Earth-Fault Protection Relay

Siemens Reyrolle 7SR110 Non-Directional Overcurrent and Earth-Fault Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens Reyrolle 7SR110 Non-Directional Overcurrent and Earth-Fault Protection Relays in India. We supply these relays for medium-voltage switchgear, industrial substations, distribution feeders and transformer backup protection requirements.

The Reyrolle 7SR110 is used where a feeder or electrical circuit requires phase overcurrent and earth-fault protection without directional measurement. It is commonly installed in radial distribution networks where fault current normally flows in one known direction.

The relay can protect incoming and outgoing feeders and can also provide backup protection for transformers, motors, generators and busbar systems. It combines protection, circuit-breaker control, electrical measurements and fault records in one compact unit.

Different 7SR110 versions are available with one or four current inputs, different binary input and output arrangements and serial or Ethernet communication options. Buyers replacing an existing relay should share the complete Siemens article number, as two 7SR110 units may have different hardware even when they look similar from the front.

ARP IMPEX handles project requirements as well as individual replacement enquiries. Share the relay part number, CT ratio, auxiliary supply, communication requirement and quantity for price and export availability.

Technical Specifications

• Brand: Siemens
• Product family: Reyrolle Argus
• Series: 7SR110
• Product type: Numerical overcurrent and earth-fault protection relay
• Protection direction: Non-directional
• Main use: Feeder protection and equipment backup protection
• Current input options: One or four CT inputs, depending on the model
• CT secondary options: 1 A and 5 A
• Rated frequency: 50/60 Hz
• Earth-fault measurement: Measured, derived or sensitive earth fault, depending on the configuration
• Binary inputs: Model dependent
• Binary outputs: Model-dependent
• Auxiliary supply: AC or DC supply, depending on the ordering code
• Protection curves: Definite-time, IEC and ANSI inverse-time characteristics
• Display: Front LCD
• Indication: Fixed and programmable LEDs
• Local communication: Front USB port
• Remote communication: RS485 on applicable versions
• Serial protocols: IEC 60870-5-103, Modbus RTU and DNP3, depending on the model
• Ethernet communication: Available on selected versions
• IEC 61850: Available on applicable Ethernet models
• Setting groups: Multiple setting groups
• Configuration software: Siemens Reydisp
• Recording functions: Fault, event and waveform recording
• Mounting: Flush mounting in protection and switchgear panels

The exact current inputs, binary contacts, auxiliary supply and communication ports must be checked against the complete Siemens ordering code.

Main Protection Functions

Depending on the selected model, the Siemens Reyrolle 7SR110 can provide:

• Instantaneous phase overcurrent protection
• Time-delayed phase overcurrent protection
• Earth-fault protection
• Sensitive earth-fault protection
• Thermal overload protection
• Negative-phase-sequence protection
• Undercurrent protection
• Broken-conductor detection
• Cold-load pickup
• Transformer inrush detection
• Circuit-breaker failure protection
• Trip-circuit supervision
• Close-circuit supervision
• Switch-onto-fault protection
• Protection lockout
• Automatic reclosing on applicable versions

The available functions differ between ordering codes. Sensitive earth fault, autoreclosing, restricted earth fault and advanced communication should be confirmed before quotation.

Why the Reyrolle 7SR110 Is Used

The 7SR110 is suitable when the protection scheme requires more than a basic overcurrent relay but does not need directional protection.

It can monitor feeder current, operate the circuit breaker, record fault information and send data to a control system. This helps reduce the number of separate devices required inside the protection panel.

The cold-load pickup function is useful when a feeder is energised after remaining switched off for some time. It allows the relay to handle the temporary increase in current without unnecessarily tripping the circuit, provided the settings have been correctly selected.

Multiple setting groups also allow the protection engineer to use different relay settings for changing network or operating conditions.

Features

• Combines phase overcurrent and earth-fault protection in one device
• Suitable for radial and non-directional distribution networks
• Available with one or four CT inputs
• Supports 1 A and 5 A CT secondary circuits
• IEC and ANSI protection curves support relay coordination
• Sensitive earth-fault options are available for low fault-current applications
• Cold-load pickup helps during feeder restoration
• Thermal protection monitors prolonged loading
• Negative-sequence protection identifies current imbalance
• Broken-conductor detection helps identify open-phase conditions
• Circuit-breaker failure protection supports backup tripping
• Trip- and close-circuit supervision monitor breaker control wiring
• Multiple setting groups suit different network arrangements
• Front display shows current measurements, trips and relay status
• Programmable LEDs provide a clear local indication
• Fault and waveform records assist maintenance and fault investigation
• USB and RS485 connections simplify commissioning and remote monitoring
• IEC 61850 versions are available for applicable substation projects
• Suitable for new panels, retrofit work and replacement requirements

Applications

Siemens Reyrolle 7SR110 Overcurrent and Earth-Fault Relays are commonly used for:

• Medium-voltage incoming feeders
• Medium-voltage outgoing feeders
• Radial distribution networks
• Industrial switchgear panels
• Utility distribution substations
• Cable feeder protection
• Overhead feeder protection
• Transformer backup protection
• Distribution transformer feeders
• Motor backup protection
• Generator backup protection
• Busbar backup protection
• Captive power plants
• Solar and wind power substations
• Oil and gas electrical systems
• Refinery and petrochemical substations
• Steel and cement plant switchgear
• Mining and mineral-processing facilities
• Water and wastewater treatment plants
• Railway and infrastructure power systems
• Protection-panel retrofit projects
• Replacement of older numerical or electromechanical relays

The range is suitable for buyers searching for a numerical overcurrent relay for MV feeders, a non-directional earth-fault relay for industrial switchgear, or a transformer backup protection relay with RS485 communication.

Selecting the Correct Siemens 7SR110 Relay

The description “Reyrolle 7SR110” does not identify the complete relay configuration. The correct model depends on the CT arrangement, auxiliary supply, required binary contacts and communication system.

Before placing an order, check:

• Complete Siemens MLFB or article number
• One-current-input or four-current-input version
• CT ratio and CT secondary current
• Measured or derived earth-fault requirement
• Sensitive earth-fault requirement
• Auxiliary supply voltage
• Required binary inputs and outputs
• Circuit-breaker control requirement
• Trip-circuit supervision requirement
• Automatic reclosing requirement
• RS485 or Ethernet communication
• IEC 61850 requirement
• Required quantity
• Delivery country

For replacement requirements, share a clear photograph of the relay nameplate and rear terminal arrangement. The existing relay setting file or panel wiring diagram can also help confirm the correct replacement.

Siemens Reyrolle 7SR110 Supplier and Exporter in India

ARP IMPEX supplies Siemens Reyrolle 7SR110 Non-Directional Overcurrent and Earth-Fault Protection Relays for switchgear manufacturers, EPC contractors, panel builders, utilities and industrial maintenance companies.

Our supply requirements include:

• Siemens Reyrolle 7SR110 feeder protection relays
• Numerical overcurrent and earth-fault relays
• Sensitive earth-fault protection relays
• Transformer backup protection relays
• Reyrolle relays with RS485 communication
• Siemens protection relays with IEC 61850
• Replacement Reyrolle Argus relays
• MV switchgear and substation protection requirements

The Siemens Reyrolle 7SR110 price depends on the complete ordering code, CT inputs, binary I/O, auxiliary supply and communication interface.

Send the complete Siemens part number, technical requirement, quantity and destination country for price, availability and export quotation.