SPCJ 4D24-AA ABB Output module

Description

SPCJ 4D24-AA ABB Output module

Product Dimensions：

Product Description

The ABB SPCJ 4D24-AA is a combined multi-phase overcurrent and non-directional earth-fault relay module belonging to ABB’s SPACOM protection relay family (frequently used inside host relay units such as the SPAJ 141 C).

It provides two-stage or three-stage selective overcurrent protection alongside a two-stage earth-fault protection unit. The suffix code “AA” specifically denotes its rated system frequency and auxiliary power supply range:

• AA Code Variant: System frequency f_n = 50 Hz, and Auxiliary Voltage U_{aux} = 80…265 V AC / DC.

Product Parameters

Product Advantages

• Dual Protection in One Module: Combines phase overcurrent protection (I>, I>>) and residual earth-fault protection (I_0>, I_0>>) in a single plug-in module.
• Flexible Tripping Characteristics: Offers both definite time delay and standard IDMT (Inverse Definite Minimum Time) curve characteristics for precise coordination with downstream/upstream protection.
• Wide Auxiliary Power Range: The AA variant handles an auxiliary voltage supply from 80V up to 265V AC/DC, making it tolerant to large station battery voltage fluctuations.
• Plug-in Modular Design: Simplifies testing, maintenance, and replacement without disturbing the fixed backplane wiring of the host relay enclosure.
• Bus Integration: Built-in SPA-bus protocol allows remote configuration, parameter reading, and event logging via supervisory automation systems.

Important Considerations and Precautions

• Check Auxiliary Supply & Frequency: Confirm your system frequency is 50 Hz and that auxiliary voltage stays within the 80…265 V AC/DC range.
• CT Secondary Shorting: Always short-circuit the Current Transformer (CT) secondary circuits before removing or servicing the relay module to prevent high-voltage hazards.
• Dip-Switch & Parameter Settings: Ensure correct DIP-switch configurations and threshold settings on the front panel matching the protection coordination study before commissioning.
• Electrostatic Discharge (ESD): Use proper grounding wrist straps when handling the unshielded plug-in module to avoid damaging sensitive microelectronic components.

Product Applications

• Feeder Protection: Provides main or backup phase-to-phase and phase-to-ground protection for distribution feeders and radial networks.
• Transformer Protection: Overcurrent and ground fault backup protection on medium-voltage primary or secondary transformer windings.
• Industrial Substation Automation: Used in switchgear panels, motor control centers, and utility power distribution systems requiring SPA-bus network communication.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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