ABB SPAJ140C Combined Overcurrent and Earth-Fault Relay

Product Description

The ABB SPAJ140C belongs to the SPACOM series, it is a combined non-directional overcurrent and earth-fault protection relay for radial distribution feeders. It provides selective short-circuit and earth fault protection for solidly earthed, resistance-earthed or impedance-earthed medium voltage power systems, and integrates breaker failure protection function. It is widely used in traditional substation feeder protection, and supports local indication and remote communication for alarm and tripping signals.

Features

• Part Number: SPAJ140C, Brand: ABB, Series: SPACOM
• Protection functions: Phase overcurrent (low-set IDMT / definite time, high-set instantaneous / definite time), earth fault (low-set IDMT / definite time, high-set instantaneous / definite time), breaker failure protection
• Output relays: 2 trip relays + 4 signal relays
• Communication: SPA bus for substation automation network
• Power supply options: 80–265 VAC / 18–80 VDC
• Self-supervision: Continuous self-monitoring of hardware and firmware, fault alarm
• Front panel: LED indicators, digital display, setting buttons for parameter configuration
• Certifications: CE, IEC 60255 compliant
• Manufacturer Status: EOL since 2016, original production stopped; supply depends on NOS surplus or fully tested refurbished units
• Typical gross weight: approx 3.35 kg, origin: Finland

Applications

• Medium voltage radial feeder protection in power distribution substations
• Industrial plant internal MV network, power plant auxiliary feeder protection
• Renewable energy station collector line backup protection
• Legacy SPACOM substation system maintenance, spare replacement and retrofit
• Oil & gas, chemical plant distribution network overcurrent & earth fault protection

FAQ

Q: What is the difference between SPAJ140C, SPAJ141C and SPAJ142C?
A: SPAJ140C is standard version; SPAJ141C and SPAJ142C are variants with higher sensitive earth fault input for high-impedance earthed systems.

Q: Can SPAJ140C be replaced by REF601?
A: REF601 is the modern ABB feeder protection replacement, but wiring, logic settings and communication protocol need reconfiguration.

Q: Does it support directional earth fault protection?
A: No, SPAJ140C is non-directional overcurrent and earth fault relay.