We had some 3 phase applications of for the mits a/c outdoor a/c units....ocp required like 60A/3p could not find any commercially available cb's(us) with gfci....went with the relay....
check out square d's web site....they offer three phase ground fault relays for great for motor applications...we had to hook up a bunch of mitsubishi ductless split a/c units.....big warning on their literature to provide "ground leakage detection"...sounded like gfci to me....relays have under...
Switchboards have different construction requirements that a distribution panelboard....Any panelboard can be called a "distribution panelboard if it has less than 10% of its OCP's serving 120 volt loads. In addition a switchboard can have both vertical and horizontal bussing. vertical bussing...
