RCD Trip time

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If an RCD was not tripping fast enough when 5 times the current rating for supplimentary protection what could be the problem? Or is it a case of change the RCD???
 
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How do i know if its a type A,B or C RCD??? On the side it says BS4293 BSEN61008, BS5419 BSEN60947-3
 
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Never heard of a type C RCD, do you mean RCBO?
type AC is a general AC type RCD,
type A RCD is an AC type RCD which will also protect against pulsating DC earth fault current components,
type B RCD provides protection against DC earth fault currents.
type S RCD (Selective) is a time delay type.


but as you have posted several times re Megger CBT-3 you are possibly talking about something else completely different related only to that particular tester.
 

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