The TBR17 series fuse type isolation switch has a rated insulation voltage of AC 800V, rated working voltages of 690V and 400V, rated frequency of 50Hz/60Hz , and rated working current of 160A~630A. Mainly used in distribution circuits and motor circuits with high short circuits , as a power switch , isolation switch , and emergency switch , and for circuit protection . This switch is not used to directly open or close a singlemotor. 

When the isolation switch replaces the fuse with an isolation knife , this switch does not have currentoverload and short circuit protection functions , onlymeets the rated making and breaking capacity specified by this switch , and is used for line isolation