How to choose the right load switch

load break switch is mainly used to break and close the load current, can also be used in conjunction with high-voltage switch with the high-voltage fuse, instead of circuit breakers. As the load switch is easy to use, the price is reasonable, so the load switch in the 10kV distribution system has been widely used. In the design of a reasonable choice of load switch, to protect the safe and reliable operation of the power grid is of great significance. 
Load switch and the correct combination of the fuse The difference between the load switch and the fuse is that the fuse has a short circuit current capacity, and the load switch only as a load current switching. It is generally believed that the load switch divides the operating current and the fuse is breaking the short-circuit current.
But when the failure occurs, because the three-phase current is not necessarily the same, and the fuse promised error, inevitably there is a three-phase fuse between the fuse time difference, the Prime Minister cut off the fault, if the load switch can not break the load current, Resulting in a transfer current and two-phase operation, causing damage to the power receiving equipment.

Fuse with impactor, with a trip device with a load switch, you can solve the problem of missing phase operation. When the fuse of the fuse melts, load switch tripping device is disconnected immediately after the striker operation. Production plant more use of four-bar linkage, when the load switch closing operation, the sub-gate spring at the same time energy storage, when the four-link mechanism dead point, closing the spring energy release, switch for closing operation, this time The energy of the gate spring is still maintained by the axle mechanism, once the impactor attack, axle out of the column, the sub-gate spring energy release, switch for sub-gate operation. Therefore, in use must be selected with a striker fuse and a mechanical trip device with the load switch.