High-impedance unit protection scheme and simple construction

The MCAG relay is designed for applications requiring sensitive settings with stability on heavy through faults. Used with a stabilizing resistor, MCAG is recommended for balanced and restricted earth fault, bus-zone and certain forms of differential protection for generators, autotransformers, reactors and motors.

The relay operates as a high impedance unit protection scheme. Due to the simple electromechanical construction, the detection element is combined with the output contacts to form one and the same device. Operation is therefore fast and reliable.

Stability and robust design for top performance

Ensuring high stability with through faults, MCAG relays benefit from a simple application technique. With tuned-to-rated frequency and a wide setting range, the MCAG model is robust and straightforward.