Description: Motor Guard Relay is basically current sensing single phasing preventer that gives total protection to three phase AC electric motor. The basic principle of operation is of sensing negative sequence current components and it trips electric motor starter as soon as it exceeds the dangerous level. This model renders protections up to motor terminals & is non-defective to the motor back e.m.f. The relays are available in two models namely MGR & MGR-C. Both models are basically same with slight difference in features like under/over voltage protection and inverse time current characteristic setting. These models ensure total protection against single phasing on supply side as well as motor side, overloading (inversely time current characteristics) reverse supply, current unbalance & low/high voltage, and auto /manual reset provision. The enclosure is constructed from high impact polysterene moulded with nylon moulded connection strip. It is available up to 200 amps. Both models offer single phasing protection even if motor is on no load. It weighs 750 grams approximately and its overall dimensions are 140 x 100 x 95mm.
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