?? SYSGR series isolating switch fuse group (hereinafter referred to as switch) is a multi-stage, manually operated switch; suitable for AC 50Hz, rated current of 660V, for infrequent making and breaking circuit. The use of unsaturated polyester glass fiber reinforced plastic (DMC), manufactured housing, has a high dielectric properties, protection and reliable operation of security. The operating mechanism is spring energy storage, instantaneous release acceleration mechanism, instant on and off multiple break contact structure. Independent of the speed of the operating handle, greatly increasing the electrical performance and mechanical properties. ? ?? Isolation switch fuse ensures turned on and off with a load circuit, when equipped with a reliable safety fuse overcurrent or short-circuit breaking protection. ?? Switch with visible disconnect state, the contact for the double power structure to ensure with load making and breaking circuit, acceleration mechanism spring energy is released instantaneously to achieve a fast or breaking (13.8 m / s), and speed independent of the operating handle, greatly increasing the ability of arc lights.