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Station X · 5th Feb 2019, 7:16 pm

I don't think there is such a thing as an RCB. RCCB's (Residual Current Circuit Breaker) sense imbalance in the currents flowing the live and neutral leads. RCBO's are similar, but also incorporate overload protection in a similar manner to an MCB (Miniature Circuit Breaker).

If the device is an RCBO then tripping could be caused by an overload rather than an earth fault.

5th Feb 2019, 7:16 pm	#4
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: KW 108 monitor scope woes I don't think there is such a thing as an RCB. RCCB's (Residual Current Circuit Breaker) sense imbalance in the currents flowing the live and neutral leads. RCBO's are similar, but also incorporate overload protection in a similar manner to an MCB (Miniature Circuit Breaker). If the device is an RCBO then tripping could be caused by an overload rather than an earth fault. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.