ABB REJ525 Overcurrent and Earth-Fault Relay

ABB REJ525 Overcurrent and Earth-Fault Relay Supplier and Exporter in India

ABB REJ525 Legacy Protection Relay – Price and Availability

ABB REJ525 is a combined overcurrent and earth-fault protection relay used for overhead lines, cable feeders, busbars and medium-voltage distribution systems. For price and availability, send the complete ABB order code, relay nameplate, quantity and destination country.

Description

ARP IMPEX supplies and exports ABB REJ525 overcurrent and earth-fault protection relays for existing switchgear panels, substations and industrial power-distribution systems.

REJ525 combines three-phase overcurrent protection and non-directional earth-fault protection in a single relay. It monitors the three-phase currents together with the neutral or residual current of the protected circuit. When a fault exceeds the selected protection setting, the relay can trip the circuit breaker, operate alarm contacts and record fault information.

ABB mainly uses REJ525 for short-circuit, time-overcurrent and earth-fault protection of overhead lines and cable feeders. It can also be applied to busbar and feeder protection in utility substations and industrial electrical networks.

The overcurrent and earth-fault sections each have a low-set and high-set stage. This gives REJ525 four main protection stages without making the relay unnecessarily complicated.

For an ABB REJ525 spare, price or availability enquiry, send the complete relay code from the front marking strip or nameplate. This is particularly important because REJ525 was supplied with two different earth-fault current input versions.

Technical Specifications

• Brand: ABB
• Model: REJ525
• Series: ABB REJ 52_ Series
• Product type: Combined overcurrent and earth-fault protection relay
• Product status: Not active since 2011
• Phase protection: Three-phase overcurrent
• Earth-fault protection: Non-directional
• Phase current inputs: 1 A / 5 A
• Earth-fault input versions: 0.2 A / 1 A or 1 A / 5 A
• Low-set overcurrent stage: I>
• High-set overcurrent stage: I>>
• Low-set earth-fault stage: I₀>
• High-set earth-fault stage: I₀>>
• Low-set timing: Definite-time or IDMT
• High-set timing: Instantaneous or definite-time
• Circuit-breaker failure protection: Included
• Disturbance recorder: Included
• Local HMI: Alphanumeric LCD with operating buttons
• Rated frequency: 50 / 60 Hz selectable
• Self-supervision: Continuous hardware and software monitoring

ABB confirms that the overcurrent and earth-fault protection sections operate independently and have their own settings and recorded data.

Features

• Three-phase overcurrent protection
• Short-circuit protection
• Non-directional earth-fault protection
• Two overcurrent protection stages
• Two earth-fault protection stages
• Definite-time operation
• IDMT operation for low-set stages
• Instantaneous or delayed high-set operation
• Circuit-breaker failure protection
• Two-stage load-shedding possibility
• Disturbance recording
• Fault and event information
• Flexible trip and signalling outputs
• External blocking/control input
• Local relay display
• Continuous internal self-supervision

The overcurrent and earth-fault functions are independent, allowing the relay settings to be selected separately for phase faults and ground faults.

Applications

ABB REJ525 can be used for:

• Medium-voltage feeder protection
• Overhead line protection
• Cable feeder protection
• Incoming feeder protection
• Outgoing feeder protection
• Busbar protection
• Short-circuit protection
• Non-directional earth-fault protection
• Utility substations
• Industrial distribution systems
• Medium-voltage switchgear
• Backup overcurrent protection
• Backup earth-fault protection
• Blocking-based busbar protection schemes
• Existing ABB REJ-series protection panels

ABB specifically identifies REJ525 for short-circuit and time-overcurrent protection together with non-directional earth-fault protection of overhead lines and cable feeders.

ABB REJ525 Order Codes

REJ525 was supplied with two different earth-fault current input arrangements.

ABB REJ525B 412BAA

• Order code: REJ525B 412BAA
• ABB article number: 1MRS091412-BAA
• Earth-fault input: 0.2 A / 1 A

ABB REJ525B 415BAA

• Order code: REJ525B 415BAA
• ABB article number: 1MRS091415-BAA
• Earth-fault input: 1 A / 5 A

These are important differences when sourcing an exact legacy spare. An existing REJ525B 412BAA should not automatically be treated as the same input version as REJ525B 415BAA.

For quotation, send the full code exactly as printed on the installed relay.

ABB REJ 52_ Protection Relay Family

REJ525 belongs to ABB’s REJ 52_ numerical protection relay family, which includes four main models:

• ABB REJ521 – Non-directional earth-fault protection
• ABB REJ523 – Three-phase overcurrent protection
• ABB REJ525 – Combined overcurrent and earth-fault protection
• ABB REJ527 – Directional earth-fault protection

All four models use low-set and high-set protection stages and were intended mainly for feeder, busbar and industrial distribution protection.

• REJ521 is mainly for earth faults.
• REJ523 is mainly for phase overcurrent.
• REJ525 combines both functions.
• REJ527 is used where directional earth-fault protection is required.

This distinction is useful when identifying an old ABB relay from an existing protection panel.

ABB REJ525 Legacy Spare and Replacement Enquiries

ABB REJ525 is a discontinued legacy relay. For an existing installation, ARP IMPEX can assist with:

• ABB REJ525 part-code checking
• REJ525B 412BAA enquiries
• REJ525B 415BAA enquiries
• 0.2/1 A and 1/5 A input version identification
• Legacy spare availability
• Existing relay matching
• Replacement enquiries
• Single-unit requirements
• Multiple-quantity quotations
• ABB technical documentation
• Export packing and international shipping

For an ABB REJ525 replacement or spare requirement, please send:

• Complete ABB order code
• Clear relay nameplate photograph
• Quantity required
• Destination country
• Required delivery date

Why Buy ABB REJ525 from ARP IMPEX?

ARP IMPEX supplies ABB protection relays for utilities, industrial plants, EPC contractors, panel builders, maintenance companies and electrical traders.

We can assist with ABB REJ525 price and availability, exact part-number checking, legacy spare requirements and international export supply.

Request a Quote for ABB REJ525

Looking for an ABB REJ525 relay supplier in India or trying to source an old REJ525 for an existing panel?

Send us the complete relay code, nameplate photograph, quantity and destination country.

Send your ABB REJ525 part number to ARP IMPEX for availability, price and export quotation.