ABB |SPAJ140C| Earth-Fault Relay
ABB SPAJ140C High Impedance Earth-Fault Relay
Description
The ABB SPAJ140C is a high-impedance differential current earth-fault (restricted earth-fault) protection relay designed for reliable fault detection in transformers, motors, and generators.
Features
- High impedance restricted earth-fault (REF) protection
- Built-in stabilizing resistors
- Fast operating time with high stability
- Immune to mechanical and electrical interference
- Digital design ensures accuracy and long-term stability
- Designed for transformer asset protection
Technical Specifications
- Auxiliary Supply Voltage Range: 80–265 V AC
ABB |SPAJ140C| Earth-Fault Relay


ABB |SPAJ140C| Earth-Fault Relay
ABB SPAJ140C High Impedance Earth-Fault Relay
Description
The ABB SPAJ140C is a high-impedance differential current earth-fault (restricted earth-fault) protection relay designed for reliable fault detection in transformers, motors, and generators.
Features
- High impedance restricted earth-fault (REF) protection
- Built-in stabilizing resistors
- Fast operating time with high stability
- Immune to mechanical and electrical interference
- Digital design ensures accuracy and long-term stability
- Designed for transformer asset protection
Technical Specifications
- Auxiliary Supply Voltage Range: 80–265 V AC