Hi,
I am looking at using an electronic relay with 1 single phase input and 4 switched outputs.
Each output can be loaded to a max. 16A with a device maximum of 40A. This means the relay itself (its input) would need to be protected by a 40A breaker. The input is split between 4 outputs internally.
The question I have is regarding the outputs. Obviously 16A on a 2.5mm cable is fine in most circumstances, however would a 40A MCB suffice for short circuit protection, if the loads connected to the relay are known (e.g. electrical heaters, pulling say 13A). The fixed load would ensure protection against overload, but would the above provide adequate short circuit protection?
Would I be better installing additional MCBs on the relay outputs, even if all loads are known/fixed?
Thanks.