Electricity is an extremely important link in the generation, delivery and use of electricity. The distribution system includes transformers and various high- and low-voltage electrical equipment. Low-voltage circuit breakers are widely used appliances.
In modern society, electricity, whether it is in industry, agriculture, transportation, national defense, culture, education, health, finance, commerce, tourism services and people's lives, is inseparable from electricity. Electricity is an extremely important link in the generation, delivery and use of electricity. The distribution system includes transformers and various high- and low-voltage electrical equipment. Low-voltage circuit breakers are widely used appliances.
Low-voltage circuit breakers are divided into two categories: universal type (also called frame type, internationally known as ACB) and plastic case type [internationally known as MCCB, MCB (small size)]. Their same role is:
(1) Under normal circumstances, do not frequently make or break the circuit or start and stop the motor;
(2) When an overload, short circuit, or undervoltage (undervoltage) occurs on the line or motor, the circuit can be automatically shut off and protected.
Circuit breakers are further divided into four types depending on the object of protection:
(1) Distribution protection type - protection of power and electrical lines (wires, cables) and equipment;
(2) Motor protection type - Designed for infrequent starting of the motor, interruption during operation, and protection against motor overload, short circuit, and undervoltage;
(3) Protection of home and similar home sites - protection of lighting circuits, household appliances, etc.;
(4) Residual Current (Current Leakage) Protection Type - A protector used to protect the human body from electrical shock and electrical fire.
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