The TBR18 series fuse type isolation switch has a ratedinsulation voltage of AC 800V, rated working voltage of 690V, 400V, rated frequency of 50Hz/60Hz , and rated working voltage of 160-630A. Mainly used in distribution circuits and motor circuits with high short-circuit currents , as a power switch , isolation switch , and emergency switch , and for circuit protection purposes . This switch is not used to directly open or close a single motor.