What is the difference between isolating switch and load break switch?
Many people do not understand isolating switch and load switch. The two switches are considered to be universal and can be replaced, so they can be used regardless of whether they are used. In fact, these two switches are different. But in some occasions, it cannot be used interchangeably. Let me tell you the difference between isolating switch and load switch.
The isolation switch itself has no arc extinguishing device, and can only disconnect the rated current at most, so it is only used as an isolation element in the circuit to isolate the power supply and the load when maintenance is required.
The load switch has an arc extinguishing device, which can cut off the fault current, and its contacts can be used as an isolation switch, which has the dual functions of isolation and circuit breaking. The load switch is generally composed of a fuse and an isolating switch. The isolating switch is used for normal circuit operation, and the fuse is used to disconnect the fault current of the circuit.
Isolation switch is a switching device that is mainly used for "isolating power supply, switching off operation, and connecting and cutting off small current circuits" without arc extinguishing function. When the isolating switch is in the open position, there is an insulation distance and an obvious disconnection mark between the contacts that meet the specified requirements; in the closed position, it can carry the current under normal circuit conditions and under abnormal conditions (such as short circuit) within the specified time. current switching device. It is generally used as a high-voltage isolating switch, that is, an isolating switch with a rated voltage of more than 1kV. Its working principle and structure are relatively simple, but due to the large amount of use and high requirements for work reliability, the design, establishment and operation of substations and power plants are required. The impact on safe operation is greater. The main feature of the isolation switch is that it has no arc extinguishing ability, and can only divide and close the circuit without load current. The entry introduces the function, characteristics, type, application, error prevention improvement, maintenance, common problems, etc. of the isolating switch, disconnector.
The load break switch is a switching appliance between the circuit breaker and the isolating switch. It has a simple arc extinguishing device, which can cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current. Classification of load switches: According to the voltage used, it can be divided into high-voltage load switches and low-voltage load switches. The load switch is mainly used to break and close the load current, and the load switch can also be used in conjunction with the high-voltage fuse to replace the circuit breaker. Because the load switch is easy to use and the price is reasonable, the load switch is widely used in the 10kV distribution network system. Reasonable selection of load switches in the design is of great significance to ensure the safe and reliable operation of the power grid. FN7, FN5
12KV load break switch, 24kv LBS,
