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    RCBO passes 30mA but fails 150mA but in a strange way. Any ideas?

    I know what you mean. I'm the same. Once I know why, I'm happy. Cause fixing a problem usually pretty straight forward. It the not knowing why that bugs the hell out of me. Sometimes it comes to me next day when wake up. Must be the "little grey brain cells" working their magic when asleep...
  2. A

    RCBO passes 30mA but fails 150mA but in a strange way. Any ideas?

    I just researched tester you quoted. There three versions, which you using?
  3. A

    RCBO passes 30mA but fails 150mA but in a strange way. Any ideas?

    When you say passes 30mA, how you testing it (i.e. @ 25mA, 30mA, & then 35mA). Also, are you using a tester that does both positive and negative part of cycle? Oops, just seen rest of your post. My question maybe irrelevant. Not familiar with tester specified.

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