Unique to the Contour Switch is the patented contour lock system, allowing the switches to be used as stand alone units or locked together with other switches. The 701CHRV also features a control knob which cannot be removed while in the ON or OFF position, but it can be removed by switching to an anti-clockwise 45 position. This switch also features removable side plates on 4 sides for access of up to 1/0 cables plus a rear cover insulating the rear terminals against any short circuits. Continuous Rating: 275 Amps DC. Intermittent Rating: 455 Amps DC.