The structure and protection of high-voltage pole-mounted circuit breakers

The pole-mounted switch is a type of safety switch installed on utility poles to ensure electrical safety. Its main function is to isolate the high voltage of the circuit. Pole-mounted switches have significant differences in terms of functionality, structure, and application scenarios. In the power system, they each play unique roles and jointly maintain the safety and stable operation of the power grid.

Column-mounted circuit breaker and load switch

The pole-mounted load switch has the functions of breaking load current and closing short-circuit current, but it cannot break short-circuit current. It is mainly used for line segmentation.

The pole-mounted circuit breaker can close, carry and open the normal current of the operating circuit. It can also close, carry and open the specified short-circuit current within the prescribed time. It can be used as the main protection for the line and is mainly used in large branch switches. Its opening capacity is strong and the number of consecutive opening and closing is large.

Operating method

The load switch is operated manually and requires human intervention to open or close the circuit.

The circuit breaker is an automatically operated device. When there is an overload or short circuit in the circuit, the circuit breaker will automatically trip and cut off the current.

Breakdown resistance and protection functions

Load switches usually have a relatively low breaking capacity and are suitable for small loads and non-overload situations. They are mainly used to control the opening and closing of circuits. However, they typically do not have overload protection or short-circuit protection functions for faults such as overload and short circuits.

The circuit breaker has a higher breaking capacity and can handle larger currents and more severe faults. It not only cuts off the circuit but also has overload protection and short-circuit protection functions, capable of promptly detecting and cutting off the faulty current.