Universal circuit breakers, also known as low-voltage circuit breakers, can also be used to manufacture and block load circuits, and can also manipulate motors that are not easy to run often. This is also the total amount of loss of the knife switch, electrical components or overcurrent relay pressure controller, and the role of undervoltage protection distribution network as an anti-cracking heat relay is a major one.

In the research and development of the power supply system and the application of the power system used in the city square, the system software data visualization, automation technology, the Internet, the real-time, the higher and higher precision of the regulations, the complex network architecture, and the widely used automation technology data process control Usually, the high equipment failure rate of the low-voltage circuit breaker also has a high provision, and the current disconnector has been unable to meet the requirements of modern electric power comprehensive automation technology. It is used in the development of key applications for intelligent technology undervoltage protection disconnectors. (Overvoltage protection under overload and overcurrent protection, etc.) low-voltage circuit breaker has various functions, simple practical operation, high blocking capacity, safety, practical operation adjustment, and has been widely used now.

The key to the intelligent use of the disconnector is composed of a part of the microcontroller, a part of the data signal data acquisition, a data output device, a display device and a computer keyboard multi-purpose transmission detection, maintenance intelligent technology, accurate measurement, external equipment, serial communication interface and switching power supply.

Typically, the main contact is closed manually or electrically in practice. After the main circuit breaker is closed, the main circuit breaker is locked in the shutdown part by the random power-off organization. The electromagnetic coil of the overcurrent tripper and the thermal components of the thermal tripper are connected in series with the main circuit, and the electromagnetic coil of the low-voltage discharge household appliances is connected in parallel with the power supply. If the circuit is short-circuited or seriously overloaded, the frame of the overcurrent tripper will be driven, and the main circuit breaker will be turned on by the power-off organization. When the circuit is overloaded, the pyrogen of thermal de-energization causes heat generation to bend the bimetal and release a random de-energized tissue. If the working voltage of the circuit is insufficient, the synchronous motor of the undervoltage protection tripper is released. The free tour system is also reasonable. When the predetermined spacing manipulation as a controller is held down to the run button and when the solenoid coil is plugged in to cause the synchronous motor to be de-energized at will during normal actual operation, the separate power outage is destroyed.