In modern society, no matter in industry, agriculture, transportation, national defense, culture, education and health, finance, commerce, tourism services and people's lives, we cannot do without electricity. In the generation, transmission and use of electricity, power distribution is an extremely important link. The power distribution system includes transformers and various high and low voltage electrical equipment, and low voltage circuit breakers are widely used electrical appliances.
Low-voltage circuit breakers are divided into two types: universal type (also known as frame type, internationally known as ACB) and plastic shell type [internationally known as MCCB, MCB (small)]. , Their same function is:
(1) Under normal circumstances, make infrequent closing and opening circuits, or start and stop the motor;
(2) In case of overload, short circuit or under voltage (insufficient voltage) in the line or motor, the circuit can be automatically cut off for protection.
According to different protection objects, circuit breakers are divided into four types:
(1) Distribution protection type-protection of power supply and electrical circuits (wires, cables) and equipment;
(2) Motor protection type-designed for infrequent starting of the motor, interruption during operation, and protection against overload, short circuit and undervoltage of the motor;
(3) Protection type for home and similar home places-protection for lighting circuits, household appliances, etc .;
(4) Residual current (leakage) protection type-a protector used to protect people from electric shock hazards and electrical fires.
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