The ES50M-65N is intended for usage as an electrical transfer switch to automatically switch multiple sources (from one to another), i.e. switching from shoreline to generator power. The ES50M-65N is primarily designed for installation in conjunction with a generator having a rated output of not larger than 12kW, an external power cord having a rated output of not larger than 2 poles, 240VAC, 50A, 1PH, 60HZ. The dimensions are 8-3/4" x 8-3/4" x 4-1/2".