ABB REJ523 Overcurrent Protection Relay

ABB REJ523 Overcurrent Protection Relay Supplier and Exporter in India

ABB REJ523 Legacy Overcurrent Relay – Price and Availability

ABB REJ523 is a three-phase overcurrent protection relay used for feeders, busbars and medium-voltage power-distribution systems. For price and availability, send the complete ABB part number, relay nameplate, quantity and destination country.

Description

ARP IMPEX supplies and exports ABB REJ523 overcurrent protection relays for existing switchgear panels, substations and industrial power-distribution systems.

REJ523 is a dedicated overcurrent relay connected to the current transformers of the protected circuit. It continuously measures the three-phase currents and operates when the current exceeds the selected setting. In a fault condition, the relay can initiate circuit-breaker tripping, provide alarm signals and record fault information.

The relay has two overcurrent stages. The low-set stage I> can operate with definite-time or IDMT characteristics, while the high-set stage I>> can operate instantaneously or with a definite time delay. This allows REJ523 to handle normal feeder overload/overcurrent conditions as well as higher short-circuit currents.

ABB used REJ523 mainly for basic protection of busbars and feeders in utility substations and industrial electrical networks. It can also be applied where single-, two- or three-phase overcurrent protection is required.

For an ABB REJ523 spare, price or availability enquiry, send the complete relay code rather than only the model number. This helps us check the exact unit against the existing installation.

Technical Specifications

• Brand: ABB
• Model: REJ523
• Series: ABB REJ 52_ Series
• Product type: Three-phase overcurrent protection relay
• Product status: Not active since 2011
• Main protection: Phase overcurrent and short-circuit protection
• Rated current inputs: 1 A / 5 A
• Rated frequency: 50 / 60 Hz
• Measuring range: Up to 50 × rated current
• Low-set stage: I>
• Low-set timing: Definite-time or IDMT
• High-set stage: I>>
• High-set timing: Instantaneous or definite-time
• Circuit-breaker failure protection: Included
• Disturbance recorder: Included
• Local display: Alphanumeric LCD
• Front communication: Optical serial interface
• Rear communication: Available for connection to substation automation
• Communication protocols: SPA bus and IEC 60870-5-103
• Self-supervision: Continuous hardware and software monitoring

The exact hardware and auxiliary supply should be confirmed from the complete ABB order number before supply.

Features

• Three-phase overcurrent protection
• Short-circuit protection
• Low-set overcurrent stage
• High-set overcurrent stage
• IDMT characteristic on low-set stage
• Instantaneous high-set operation
• Two separate setting groups
• Circuit-breaker failure protection
• Two-stage load-shedding possibility
• Disturbance recording
• Fault and event data
• Configurable trip and signalling outputs
• Front optical communication
• Rear serial communication
• Local LCD display
• Continuous self-supervision

Applications

ABB REJ523 can be used for:

• Medium-voltage feeder protection
• Incoming feeder overcurrent protection
• Outgoing feeder protection
• Busbar protection
• Cable feeder protection
• Short-circuit protection
• Industrial power-distribution systems
• Utility substations
• Medium-voltage switchgear panels
• Backup overcurrent protection
• Single-phase overcurrent protection
• Two-phase overcurrent protection
• Three-phase overcurrent protection
• Two-stage load shedding
• Existing ABB REJ-series installations

ABB specifically identifies REJ523 for the basic protection of busbars and feeders in utility substations and industrial power-distribution systems.

ABB REJ523 Protection Stages

Low-Set Overcurrent Stage I>

The low-set stage is used for normal feeder overcurrent protection.

It can be selected with:

• Definite-time operation
• IDMT operation

This stage is useful where the relay needs to coordinate with other overcurrent protection devices in the network.

High-Set Overcurrent Stage I>>

The high-set stage is intended for higher fault-current conditions and can operate with:

• Instantaneous operation
• Definite-time operation

ABB also allows the high-set stage to be adjusted within the lower part of its setting range. In this arrangement, REJ523 can be used for two-stage load-shedding applications.

ABB REJ523 Order Code

ABB documentation gives the following basic unit:

REJ523B 414BAA

ABB Article Number: 1MRS091414-BAA

The order number identifies the relay hardware and is shown on the marking strip on the front panel.

For an exact ABB REJ523 replacement or legacy spare, please send the full order number exactly as printed on the relay.

ABB REJ 52_ Protection Relay Family

REJ523 belongs to ABB’s older REJ 52_ numerical protection relay series.

The main models in this family are:

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

ABB’s wider REJ numerical range also includes the earlier REJ511, REJ513, REJ515 and REJ517 models.

For buyers comparing the models:

• REJ521 – choose for earth-fault protection
• REJ523 – choose for phase overcurrent protection
• REJ525 – combines overcurrent and earth-fault protection
• REJ527 – intended where directional earth-fault protection is required

The exact model fitted in an existing panel should always be confirmed from the relay nameplate.

ABB REJ523 Legacy Spare Availability

ABB REJ523 is a discontinued legacy relay. ARP IMPEX can assist with enquiries for:

• ABB REJ523 price and availability
• REJ523 part-number checking
• Existing relay identification
• Legacy spare requirements
• Failed relay replacement enquiries
• Single-piece requirements
• Multiple-quantity quotations
• ABB documentation
• Export packing
• International shipping

For a matching unit, please send:

• Complete ABB REJ523 order code
• Clear nameplate photograph
• Quantity required
• Destination country
• Required delivery date

Why Buy ABB REJ523 from ARP IMPEX?

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

We can assist with ABB REJ523 legacy spare enquiries, part-code checking, price, availability and export supply.

Request a Quote for ABB REJ523

Looking for an ABB REJ523 overcurrent relay supplier in India or checking an old REJ523 installed in your switchgear?

Send us:

• ABB part/order code
• Relay nameplate photo
• Quantity
• Destination country
• Delivery requirement

Send your ABB REJ523 part number and quantity to ARP IMPEX for availability, price and export quotation.