Hello, Long time no post but I hope you are all OK.
I'm curious about something. Anyone know what is inside a type B RCD that is different from what's inside a type A RCD? What component parts are different and what's the physics behind the tripping of a type B that is different from the tripping of a type A?
I've heard the terms blinded and flooding being bandied around on the virtual water cooler lately so I thought I'd do a little quiet due-diligence. The web can be rather conflicting though. Ever wish you'd never started something?
Am I right that a type A will disconnect ac and pulsating dc and a type B does those two with smooth dc as well? I can also find a site that tells me type A only does ac.
Also, if a type A is subject to a DC fault in one of the circuits, say a charger, they, at the water cooler, say it will be 'blinded' and won't trip. Well, as far as I can see that could be partially true and it might be unable to see other (ac) faults in the installation - but I'm thinking there'd be a level of DC fault at which it would not go 'blind'.
Add to that the conundrum that a pulsating dc surely involves time so it will have a level of frequency?
I've managed to get myself proper confused now and wonder if you can help with what happens inside the type B that makes it so different, not to mention expensive.
Zs
