Residual current waveform of type B

News | | Sep 01,2024

Type AC or type A rcd, com conforms to the standard

IEC/ EN 61008 and IEC/EN 610091), applicable to Most types of families and the like The application. However, the growingUsing power electronics technology Leakage current can occur in household appliances with a ground connection . In both have waveforms with high DC com components and/or high frequencies
Fault and no fault conditions. these Current, not applicable to Type A or Type Ac leakage circuit breaker;
Their normal operation may be affected. It must be said that Type A rcd,. The rule is immune to the residual current. The overlap of direct current is up to 6 mA. If the DC leakage exceeds 6mA, correct operation of type A
Circuit breakers are not guaranteed.

It depends, type A Type or AC residual current circuit breaker may therefore have the following disadvantages: Residual current desensitization.The circuit breaker may not trip.It is correct in the event of a ground fault A device that generates an electric current.

Has a high DC component or high Frequency (trip failure, delay or Excessive residual current value); Residual current desensitization The current circuit breaker may not Trip properly in case of failure.On the other circuit
Same RCD(even with this fault current Has a sinusoidal alternating shape; No fault interference trip. To solve these problems, Class B Leakage circuit breaker . Introduced in the 1990s, its first Versions of the IEC 62423 product standard date back to 2007 (and even earlier)
In recent years, the F-type rcd has been introduced, which has intermediate characteristics. Between type A and Type B rcd. Wait for an actual product standard B type leakage circuit breaker; A telephone report referring to IEC 60755 technology (general requirements Residual current operation protection device Equipment), which contains generic.

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