I've posted the specs above, Barry.
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It's a thermal Circuit breaker BTW.
Thing is that balanced mains aren’t usually used at home... there is a potential fault condition where a fuse blows in the live phase, but you could still have 120V across neutral. This is why RCBOs are used on the secondaries, it would detect this fault condition. Don’t forget that the gear is no longer bonded to earth, but bonded to the centre tap of the secondary.
Which in turn is connected to the mains earth, or should be. Otherwise your are correct in what you say.
Also there could be a fault with partial insulation breakdown (surface tracking) such that a leakage current of more than 30mA is drawn from one side of the transformer secondary winding. This leakage current will thus in turn be drawn from the primary, but will not be a 'residual' current as it will flow equally in the live and neutral wires of the (unbalanced) primary side, so any RCBO fitted in the consumer unit will not be affected and will not operate under this fault condition.
Hi Jerry
How did you get on the Airlink balanced power supply? I'm thinking of getting one for my active speakers and digital front end.
Jonathan
I have mixed feelings about mine.....