MCAG relays provide high-speed differential protection for various types of power system plants Including generators, reactors, busbars, motors and the individual windings of power transformers. The relays provide current-calibrated busbar differential and have an attracted armature design with simple and robust construction.

Key features:

• High thermal withstand - improved when used with the stabilising resistor
• Long service history, over 43,000 delivered since 1984
• Design pedigree coming from over a million auxiliary relays in-service

Key benefits:

• High stability during through faults  Operation is fast and reliable (25ms at 5 x setting)
• Easy integration into 4U height MIDOS rack schemes
• Highly-tuned to the fundamental to prevent spurious operation

Main characteristics:

• 3 element relay supplied in a 30TE (size 6 inch) case
• Supplied with a stabilising resistor
• Optional Metrosil available to limit CT saturation voltage
• Use with MVTP where scheme buswire supervision is required