Trip Protection for 3-Pole Circuit Breaker with GFP

What size breaker? Is the GFP adjustable?

Sounds to me that you need to make space for what works properly.

Are you sure you are wiring the Ground Fault Breaker into the panel correctly? There should be a fourth lead that connects to the ground bar inside the panel. If this is not properly connected, the GF breaker will trip on a false ground fault.

If the breaker is wired to the three phases and not the neutral, and the load is unbalanced, then of course the thing will trip, as the unbalance current is that flowing in the neutral.

Check the manufacturer's instructions and wire the thing up accordingly.

GA, PW!

GFP is just like any other differential protection scheme. It will only work properly if you monitor every in and out of the system (4 wires = 4 points must be monitored).

I wondered about the same things both CW, and PW mentioned, but you indicated you do not have the problem using the 4-pole.

Hence the reason for my reply.

The only problem i have with 4 pole CB is the space, because we don't have much space left to add too much cubical.

put in the comments above i saw a few comments that might solve my problem, so we i will try to add a monitaring relay with toride to monitor the 3-pole & the neutral all togatherto see what is the result, & will come back to you.

Thanks Transcendian, and thanks for every body commented in this topic.

I attempted to amend my post, but ran out of time.

Suspect same as others and look towards neutral.

Had a case where in attempting to run an HMI light the arc of the light was sensed by the GFault protector, as a short. Had to find an outlet that was not Ground Fault protected to run that light.

Can't imagine what you might be running on the circuit that replicated that problem.

If 4 pole does not trip nonsensically,then u need to check yr load balancing under the 3 pole and mostly check yr neutral and how it should be connected.Pls seperate and connect yr neutral properly to make a healthy cct.

Concentrate on yr neutral link.Change yr connection.

Patrick Whowha