One of the most interesting things about this RCD/GFCI is that it is a type-A designed to detect pulsing DC from a mains voltage rectifier. Something that can defeat standard AC RCD's/GFI's in some fault scenarios.
It appears that Rolec have had quite a lot of these breakers fail in the same way, including the single phase ones, and usually on the same terminal.
I mentioned the large test resistor and then got distracted. It's basically a resistor that deliberately causes a test current to bypass the sense coil so it detects an imbalance. When you press the test button on an RCD/GFI like this it emulates a fault to show the breaker is detecting it electronically and then tripping mechanically.
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It appears that Rolec have had quite a lot of these breakers fail in the same way, including the single phase ones, and usually on the same terminal.
I mentioned the large test resistor and then got distracted. It's basically a resistor that deliberately causes a test current to bypass the sense coil so it detects an imbalance. When you press the test button on an RCD/GFI like this it emulates a fault to show the breaker is detecting it electronically and then tripping mechanically.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Neutral terminal gets 3 times the power passed through it, hence the failure..😅
So why is it always the left contact that always fails? Well, I notice that the switch is on the right, so it could be that the mechanical force that holds the contacts together when the switch is closed is weaker further away from the switch and so a poorer quality contact is made, leading to a bit of resistance and hence overheating.
meh those things cost fortune compared to usual rcd… so they don't contain much components?
Had a presentation from rolec presently lovely guys but have to say my eye brows knitted together when they presented the new TruPen system for home charging. Which by the way All new home after Feb will need Smart chargers. Has NO Earth. Sure it's all tested but still made my head itch as a WHY.
Rolec RCBO,s have always been on the very cheap side compaired to other makes and the the caravan hookups the same.
I say it was a bug in the contacts
UK circuit breakers look so complex they look like they’re made to fail
I would guess the spring that holds tension on the 4 contacts is either not strong enough when the RCD gets hot or the arm that hold the 4 contacts slightly twists causing less pressure to be applied to the final contact
We had the same problem with a new apartment in China. Twice they replaced a Siemens RCD before ripping out all the wiring and replacing it with better quality not a small job. Might be a bad batch of cable?
Why isn’t there rating for what kinda short-circuit it’s developed for?
It looks a lot like the brand Gacia we use in Holland
the cut to the whole thing being apart with parts strewn all around the bench like everything just exploded made me audibly laugh out loud
I bet it made its own issue 😂😂
Funny it's the connection bit, like it's a loose connection and been sparking over a long time burning and managed to arc the burnt bit and trip it just a guess tho lol