tonyv Posted February 27, 2011 Share Posted February 27, 2011 I know one should use a type AC RCCD where the load includes thyristor-controlled devices; otherwise it's OK to use type A. I assume from this that type AC is a lot more expensive than type A, otherwise one could use AC everywhere, without worrying about what's connected to it. I don't recall seeing different types in the UK.What I don't know is how type AC technically differs from type A; why should a non-sinusoidal current waveform affect its operation? Any expert knowledge out there? Link to comment Share on other sites More sharing options...
Badger LX Posted February 27, 2011 Share Posted February 27, 2011 You have your facts the wrong way around. Type AC interrupteurs différentiel are the cheaper kind & only deal with AC faults.Type A deals with both AC & DC faults & are marginally more expensive in the common sizes, & a lot more so for triphasé types.I believe there is a move afoot to make Type A standard & for Type ACs to be phased out as then all the bases are covered. Link to comment Share on other sites More sharing options...
tonyv Posted February 27, 2011 Author Share Posted February 27, 2011 Oops, yes, thanks Badger, I did get the designations mixed up. Thanks for the explanation re tthe DC component of the fault current. Link to comment Share on other sites More sharing options...
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