QGL- 63~3150A load isolation switch 7 specifications of QGL load isolation from 63A to 3150A : Basic model of modularized design, 3 poles 4 poles ( 3 poles + on and off neutral pole). It is suitable for electric isolation. Switches over 1000A are only suitable for electric isolation. Mark window is set in the front side to indicate the on and off state of the contact. Two group of auxiliary contacts can be assembled.