Type A Electromagnetic RCCB Class B 4P 63A Electronic Residual Current Circuit Breaker 2P AC RCBO Air Switch leakage protector
ID RCCB A AC Electromagnetic Type Leakage Circuit Breaker MCB 2P 63A Residual Current Circuit Breaker 4P
The difference between 2P and 4P
The difference between E type and EM type
EM type: The electromagnetic trip type leakage protector uses the electromagnetic trip as the intermediate mechanism to disconnect the power supply when the leakage current occurs.The disadvantages of this protector are high cost and complicated manufacturing process.The advantages are: bai magnetic elements have strong anti-interference ability and strong shock resistance (impact of overcurrent and overvoltage);No auxiliary power supply is required;The leakage characteristics after zero voltage and phase break remain unchanged.
E type: The electronic leakage protector takes the transistor amplifier as the intermediate mechanism. In case of leakage, the amplifier amplifies and then passes to the relay. The relay control switch makes it disconnect the power supply.The advantages of this protector are: high sensitivity (up to 5mA);Small setting error, simple process and low cost.The disadvantages are as follows: the transistor has weak impact resistance and poor resistance to environmental interference;Auxiliary working power supply is needed (electronic amplifier generally needs dc power supply of more than ten volts), so that the leakage characteristic is affected by working voltage fluctuation;When the main circuit is out of phase, the protector will lose its protection function.
Detection Waveform Type and Classification
The difference between AC class and A class and B class
AC Class leakage circuit breaker:
AC class leakage circuit breaker is designed for power frequency sinusoidal leakage current. It can protect the sinusoidal leakage current suddenly applied and slowly rising.
A Class leakage circuit breaker :
A class leakage protector can not only cover the functions of the traditional AC leakage protector, but also provide adequate protection against faults with pulsating DC components in the residual current.Common electrical equipment in daily life that is easy to cause pulsating DC residual current are: laptop, tablet computer, mobile phone, microwave oven, induction cooker, refrigerator, washing machine, air conditioner, charging pile, etc.The type A leakage circuit breaker and the type AC leakage circuit breaker are basically the same in working principle (measuring the leakage value through the zero-sequence current transformer), but the magnetic characteristics of the transformer are improved.It ensures trip under the following conditions
(a) Of the same type as AC.
(b) Residual pulsating DC current.
(c) The remaining pulsating DC current is superimposed with A smooth DC current of 0.006a
B Class leakage circuit breaker :
B class leakage circuit breaker can protect sinusoidal AC signal, pulsating DC signal and smooth signal reliably, which has higher design requirements than type A leakage circuit breaker.It ensures that under the following conditions.
(A) is identical to Type A
(B) Remaining sinusoidal ALTERNATING current up to 1000Hz
(C) The remaining AC current superimposed with a smooth DC current of 04 times the rated remaining current
(D) residual pulsating dc current plus 04 times rated residual current or smooth dc current of 10mA (larger value for both)
(E) Residual DC current generated by the following rectifier circuits:
for 2-pole, 3-pole and 4-pole leakage breakers, wire to wire half-wave bridge connections