Product Overview

The ABB SPAJ144C-AA is a microprocessor-based protection relay designed for dependable overcurrent and earth-fault protection in medium-voltage power distribution systems. It is suitable for radial feeders and general protection tasks in industrial plants, substations, and utility networks.

The relay combines phase overcurrent and earth-fault protection with selectable definite time and inverse time characteristics. High-set instantaneous elements provide fast fault clearance, while integrated circuit breaker failure protection improves overall system security. Flexible output relay logic allows easy integration into existing protection schemes.

As a member of ABB’s SPACOM protection family, the SPAJ144C-AA offers stable long-term operation, continuous self-supervision, and compatibility with distribution automation and DCS environments.

Key Functions and Characteristics

• Three-phase overcurrent protection with low-set and high-set stages

• Earth-fault protection with definite time and IDMT characteristics

• Instantaneous tripping for high fault currents

• Integrated circuit breaker failure protection

• Continuous self-diagnostics for internal electronics

• Local display for values, events, and settings

• Remote configuration and monitoring support

Typical Applications

• Medium-voltage feeder protection

• Industrial power distribution systems

• Utility substations

• Solidly earthed, resistance-earthed, or impedance-earthed networks

Technical Information

• Model: SPAJ144C-AA

• Product Type: Combined Overcurrent and Earth-Fault Relay

• Product Family: SPACOM

• System Compatibility: DCS / Distribution Automation

• Communication: Ethernet router

• Condition: Brand New

• Origin: Sweden

• Weight: 3.36 kg

• Dimensions: 14 × 25 × 16 cm

• HS Code: 8537101190

• Lead Time: In Stock

• Minimum Order Quantity: 1