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Description：

The combined overcurrent and earth-fault relay SPAJ142C is intended to be used for the selective short-circuit and earth-fault protection of radial feeders in solidly earthed, resistance earthed or impedance earthed power systems. The integrated protection relay includes an overcurrent unit and an earth-fault unit with flexible tripping and signalling facilities. The overcurrent and earth-fault relays can also be used for other applications requiring single-, two-, or three-phase overcurrent protection and sensitive earth-fault protection. The combined overcurrent and earth-fault relay includes a circuit-breaker failure protection unit.

The combined overcurrent and earth-fault relay SPAJ142C is part of ABB’s Substation concept extending ABB’s solution for the control and management of electric power systems.

Specification：

Frequently asked questions

Q1: What is the ABB SPAJ142C?

A1: It is an integrated protection relay used in electrical systems to provide protection, monitoring, and control of power circuits and equipment.

Q2: What is the SPAJ142C rated voltage?

A2: The SPAJ142C rated voltage is 250 V AC/DC, suitable for a wide range of industrial and power system applications.

Q3: What is the SPAJ142C continuous carrying current?

A3: The SPAJ142C relay supports a continuous carrying current of 5 A under normal operating conditions.

Q5: What is the SPAJ142C main function of this protection relay?

A5: It provides protection against electrical faults such as overloads and abnormal conditions, ensuring safe operation of power systems.

Product Applications

Metallurgical and steel plants: Used for high-voltage motor protection and distribution feeder protection.

Oil and chemical plants: Provides reliable overcurrent and short-circuit protection for power distribution systems in hazardous areas.

Building materials and cement plants: Protects the power grid from load fluctuations caused by the start-up and operation of large machinery.

Light industry and textile manufacturing: Used for automated monitoring and control of various power distribution rooms within the plant area.

Public utilities and power plants: Provides selectable short-circuit and grounding protection for radial distribution feeders.