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New wylex mini RCBO
Former Community Member
I can’t help but notice how small these are, but where has the earth tag gone? How do these devices detect earth?
I’ve notice a tiny metallic strip on the back and front of the breaker but the one on the back doesn’t make any contact with the board as the din rail in wylex boards actually have a groove.
A lot of RCBOs were made with just L & N and no E required. An RCD of any flavour (RCCB, RCBO, SRCD etc etc) do not require an earth to monitor. That`s whay we call them Residual Current Devives and not Earth Leakage Devices although in practice they are often detecting Residue to confirm leakage.
A lot of RCBOs then gained an earth lead simply to ensure power across the detecting/tripping part of the device in the event that N was lost. I suppose a big capactor could do a similar job by ensuring that an RCBO would continue to trip if power was lost before or just after the trip cycle was initiated. Such a capacitor would be relatively big to hold enough charge to complete that so the earthlead as an alternative way to give a voltage until L disconnected seems to be the approach.
That`s my take on it.
The wiser on here(Mapj1/DaveZ/Gkenyon/JP etc) might l give a better and correct explanatiom.
A lot of RCBOs were made with just L & N and no E required. An RCD of any flavour (RCCB, RCBO, SRCD etc etc) do not require an earth to monitor. That`s whay we call them Residual Current Devives and not Earth Leakage Devices although in practice they are often detecting Residue to confirm leakage.
A lot of RCBOs then gained an earth lead simply to ensure power across the detecting/tripping part of the device in the event that N was lost. I suppose a big capactor could do a similar job by ensuring that an RCBO would continue to trip if power was lost before or just after the trip cycle was initiated. Such a capacitor would be relatively big to hold enough charge to complete that so the earthlead as an alternative way to give a voltage until L disconnected seems to be the approach.
That`s my take on it.
The wiser on here(Mapj1/DaveZ/Gkenyon/JP etc) might l give a better and correct explanatiom.
