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Deleted member 9648
I did also post on another forum as you say to try & find out more information. I found the other post that one of the replies points to & it does indeed appear to be the same issue affecting the B6 RCBO that I have, specifically passing all but the x5 test at 180 deg.
Testing was carried out directly at the RCBO terminals with no load connected. 0 deg @ 30mA, 180 deg @ 30mA, 0 deg @ 150 mA, 180 deg @ 150 mA at which point the test is cancelled as the RCBO does not trip within 40mS.
A couple of people are saying that there is a recall. MK have told me there is a known problem & to wait for their official announcement regarding the issue. The person I spoke to was very cagey about what he would & wouldn't tell me & specifically said that he'd been instructed not to divulge any details. When asked if he would confirm whether the serial number range I had been informed about elsewhere was the only range affected, he wouldn't even confirm the numbers I already knew about.
I've been checking the Electrical Safety First site regularly & there's nothing on there to date.
This might be the problem, it is a known characteristic that some RCBO's do not test directly to the terminals for some obscure technical reason. A short pair of tails are required or testing on a circuit connected to the RCBO. MK should be aware of this though if it affects their product.