Which protection is provided by the RCD?
The RCDs, that means Residual Current Circuit Breaker, are automatic protections that cut the electric line on which they are installed in the event of a ground fault (current leakage to ground). They are protections against indirect contacts.
What is the difference between type AC, type A and type B RCDs?
AC type RCDs are only sensitive to sinusoidal type fault currents. Type A RCDs, on the other hand, are sensitive to both sinusoidal currents and "unidirectional pulsed" currents, which may be present, for example, in systems with electronic devices for rectifying the current. These devices are capable of generating pulsed‐shape fault currents with continuous components that an AC type RCD is unable to recognize. The type B RCDs, besides being able to protect against sinusoidal and "unidirectional pulsed" fault currents, also protect against DC earth fault currents above 6mA DC. They also protect against high frequency fault currents.
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