A small leakage circuit breaker is mainly composed of a circuit breaker part and a leakage current component (tripper). The circuit breaker part includes contacts, shell, operating mechanism, electromagnetic system, tripping mechanism, arc extinguishing device, etc., which can realize overload and short-circuit protection; the leakage current component consists of zero sequence transformer, electronic discrimination control circuit, electromagnetic tripping system and tripping connecting rod, etc., which is used to detect and process leakage current.
Working principle
Under normal circumstances, the vector sum of currents in the circuit is zero, and the zero-sequence current transformer has no voltage output. When a leakage fault occurs in the circuit, the current vector sum is no longer zero, and the secondary output terminal of the zero-sequence current transformer generates a voltage, which turns the thyristor on, and the electromagnetic tripping system operates, pushing the tripping link to trip the circuit breaker and cut off the power supply within 0.1s, thus playing the role of leakage protection.

Rated working voltage: 230V, 400V, suitable for different circuit systems.
Rated current: 6A, 10A, 16A,20A, 25A, 32A, 40A, 50A, 63A
Rated leakage action current: 30mA, 100mA, 300mA
Leakage action time: no more than 0.1s to ensure quick power cutoff and reduce the risk of electric shock.

Compact design: Small in size, the width is usually only 18 mm or multiples thereof, making it easy to install in distribution boxes with limited space. Multiple units can be installed on the same distribution board to improve space utilization.
Easy installation: Most use standard guide rail installation methods, which can be quickly and easily installed on the guide rail of the distribution box. Some also have unified terminal heights and handle positions, further simplifying the installation process.
Clear indication: Some small leakage circuit breakers can clearly display the on-off status of the product through the built-in indicator window, and some can also indicate leakage faults, making it easier for users to understand the circuit conditions in a timely manner.

Application scenarios

Household electricity: It can be installed at the home main switch or branch switch of the household distribution box, such as the kitchen socket circuit, bathroom circuit, etc., which can effectively protect the family from the risk of electric shock and prevent electrical fires.
Commercial places: Suitable for power distribution circuits in office buildings, shops, etc., to provide safety guarantee for office equipment, commercial appliances, etc.
Industrial field: It can be used in power or lighting distribution lines in factory workshops and warehouses to protect the safety of industrial equipment and operators.
Public places: Power distribution systems in crowded places such as schools, hospitals, shopping malls, hotels, etc. play an important role in ensuring the safety of personnel and the normal operation of equipment.