I delta M

This is a RCD so breaks only one kind of fault. Are they suggesting 1000A if no death and glory 100A fuse but 10000A with one? I have searched a lot of literature but cannot find a definitive answer.

I think that is probably what it means.

This link may help - see page 11.

As I understand it, I_m is the rated breaking capacity and I_Δm is the rated residual breaking capacity.

Confusingly, in BS7671, I_m is something completely different.

I think that is probably what it means.

This link may help - see page 11.

As I understand it, I_m is the rated breaking capacity and I_Δm is the rated residual breaking capacity.

Confusingly, in BS7671, I_m is something completely different.