bent wrote:
Anyone familiar with the inside of this type of switch

Nope. All my big fixed machines have pushbuttons controlling proper
NVR magnetic starters with overload trips. When I do the last couple,
they'll all have separate locakable isolators and knee-paddles for off
too.

UK practice as standard is much better than the US anyway, but this use
of simple toggle switches scares the hell out of me. It's nearly as
dangerous as not wiring your neutrals up right...