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The SPAJ140 is a versatile, microprocessor-based protection relay manufactured by ABB for medium and high voltage distribution networks. This compact unit combines overcurrent and earth-fault protection functions in a single device, making it ideal for feeder protection in substations and industrial power systems. The SPAJ140 ensures reliable detection of fault conditions and rapid isolation of defective network sections.

Model SPAJ140

Manufacturer ABB

Protection Functions Overcurrent (TOC/IOC) + Earth-Fault

Current Input 1A or 5A (selectable)

Operating Voltage 40-265V AC/DC

Frequency 50/60 Hz

Trip Output 2 changeover contacts

Operating Temperature -10°C to +55°C

Protection Class IP20 (front), IP10 (rear)

Configuration: Program the SPAJ140 protection settings via the front panel HMI or serial communication port using ABB's CAP 505 software.

Setting Groups: Select appropriate parameter sets (Setting Group A/B) based on network operating conditions.

Monitoring: Continuously monitor phase currents and residual current through the SPAJ140 display or remote SCADA interface.

Fault Response: Upon detection of overcurrent or earth-fault conditions, the SPAJ140 initiates the programmed tripping sequence and records event data.

Reset: After fault clearance, reset the SPAJ140 indicators manually or automatically as configured.

⚠️ Critical Safety Guidelines:

Ensure all primary circuits are de-energized and isolated before installing the SPAJ140

Verify correct CT polarity connections to prevent maloperation of the SPAJ140 protection functions

Install external shorting blocks on current transformer secondary circuits during wiring work

Confirm auxiliary supply voltage matches the SPAJ140 rated range (40-265V AC/DC)

Maintain minimum clearance distances as specified in the SPAJ140 technical manual

Never operate the SPAJ140 with the front cover removed — risk of electric shock

No display on SPAJ140 Auxiliary supply failure Check voltage at terminals; verify supply range

Unwanted tripping Incorrect settings or CT wiring Review settings; verify CT polarity and ratio

Failure to trip Setting too high or output relay fault Reduce pickup value; test output contacts

Communication error Wiring or protocol mismatch Check RS-232/RS-485 connections; veri

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