RCBO query.

[Simonslimline]

Is there any difference between SPSN-(single pole & switched neutral) & double pole RCBO's?

Thanks

 

[Marvo]

Yes there is. RCBO can detect earth leakage fault current (low insulation fault current) (IΔN usually 30mA). RCBO's also detect overload fault currents and serves as an OCPD.

An SPSN or SP+N as it's also known can detect overload currents on the live side only, not the neutral side. It will however disconnect the neutral as well in the case of an overload fault on the live side. When an SP+N disconnects the contact on the live side is opened fractionally before the neutral, when it is reset the neutral is made before the live. SP+N circuit breakers do not detect earth leakage faults.

View attachment ect114.pdf

View attachment ET214.pdf

 

[Simonslimline]

Thanks for that Marvo. So i guess a Double pole RCBO will break both Line & neutral at the same time?

EDIT...


Poles and Number of Poles
The poles of an RCD may be one of three types:
i) A solid neutral pole – a solid neutral conductor that has no contacts. ii) A switched neutral pole – a pole with contacts that are not rated for making and breaking capacity. This pole makes early and breaks late, and therefore will not
be required to be fully rated. iii) A rated pole – a pole which is fully rated with making and breaking capacity.