aux. Supervision & trip relays

An ABB electromechanical relay is a protection and control device that relies on physical moving parts (such as magnetic armatures, induction disks, or induction cups) to open or close electrical contacts. When an electrical parameter (current, voltage, power, or frequency) exceeds a pre-set threshold, the electromagnetic force overcomes a restoring spring or restraining mechanism to operate the output contacts, triggering a circuit breaker to isolate a fault. 

Electromechanical relays have protected power systems for over 100 years. They remain in service because :  

Robustness & Simplicity : They are immune to software glitches, firmware bugs, cyberattacks, and electromagnetic interference (EMI/EMP). 

Proven Track Record : Many legacy units function reliably for 30–50+ years with proper maintenance. 

Because electromechanical relays feature moving parts, mechanical wear, dust accumulation, and contact oxidation can occur over time. ABB recommends a routine maintenance cycle every 1 to 3 years, depending on the operating environment (humidity, vibration, ambient temperature). 

Yes. Synergy ABB Authorised Distributor (Channel Partner) provides direct replacement solutions and migration paths. Older electromechanical relays can be upgraded to modern digital numerical relays—such as the ABB Relion® series (REX605, REX615, REX640).