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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