"harry" wrote in message
...
On Tuesday, 22 January 2019 08:55:14 UTC, Jim GM4DHJ ... wrote:
do you think the merrycan way of switching with down off is more
sensibubble
that what we do in the uk ?

Down was always on in the UK But now it seems to be up for on.
Blasted EUSSR I 'spect.

Maybe to do with the mechanism of MCBs .The toggle doesn't have to be
lifted to trip?

Does gravity play any part in tripping an MCB or RCD? I thought you
tensioned a spring when you turned the switch on, and when the circuit
breaker tripped, a solenoid that was holding the switch on (counteracting
the spring) was released. The weight of the switch toggle would make a very
small difference, but much less than the tension of the spring.