What is the scope of application of residual current circuit breaker?

The residual current circuit breaker is suitable for AC voltage to AC400V, frequency 50HZ, and rated current to 1250A and below in low-voltage power grids. Possible fire hazard due to detected long-standing ground faults.

• What is the classification of residual current circuit breaker?

• What is the scope of application of residual current circuit breaker?

• What are the main characteristics of residual current circuit breaker?

What is the classification of residual current circuit breaker?

The residual current circuit breaker is divided according to the number of poles: single pole; two poles; three poles; four poles.

residual current circuit breaker is divided according to the action mode of residual current function: residual current protector (current type electromagnetic type) independent of line voltage; residual current protector (current type electronic type) related to line voltage.

residual current circuit breaker is divided according to the possibility of adjusting residual current: residual current protector with single residual current operating current; residual current protector with multiple residual current operating current setting values;

residual current circuit breaker is divided according to the delay of adjusting the residual current function: residual current protector without delay (non-delay type is fast type); residual current protector with delay (delay type is S type).

The residual current circuit breaker is divided into: AC type; A type; B type according to the residual current action characteristics.

What is the scope of application of residual current circuit breaker?

(1) The residual current circuit breaker is suitable for electrical equipment classified as Class I for protection against electric shock. The environment where the equipment is located is a normal environment, and the safety voltage limit for personal electric shock is 50V.

(2) residual current circuit breaker is suitable for places with high requirements for electric shock and fire protection and all kinds of low-voltage electrical equipment and sockets used in new, renovated and expanded projects. Residual current protectors should be installed.

(3) For newly manufactured low-voltage power distribution cabinets (boxes, screens), power cabinets (boxes), switch boxes (cabinets), operating tables, test benches, as well as machine tools, hoisting machinery, various transmission machinery and other electromechanical equipment In the power distribution box, while considering the protection of equipment overload, short circuit, voltage loss and disconnection, leakage protection must be considered. When using the above equipment, users should give priority to electrical equipment with residual current circuit breaker.

What are the main characteristics of residual current circuit breaker?

The residual current circuit breaker iron core surrounds all the current-carrying conductors of an electrical circuit, and the magnetic flux generated in the magnetic core is related to the arithmetic sum of the currents of these conductors at an instant; the current flowing in one direction is assumed to be positive ( I1), the current flowing in the opposite direction is negative (I2).

In a normal loop without fault, I1 + I2=0, there is no magnetic flux in the magnetic core, and the electromotive force in the coil is zero. The ground fault current Id flows through the magnetic core to the fault point, but returns to the power supply either through the earth or through the protection line of the TN system.

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