Overcurrent Protection requirements for relay

[Solar Jake]

I have a relay enclosure that controls a contactor for a solar PV circuit. The relay enclosure has multiple test blocks and fuse blocks from the factory, and has 3 circuits going to the enclosure from the main panel. From the house panel, there is a 3 pole breaker for the relay voltage sense, a single pole breaker for the power supply to the relay, and another single pole breaker that powers the normally open contactor that the relay controls. Do all 3 of those breakers ( 2 single pole, and 1 three pole) need to disconnect at the same time in the house panel per NEC 240.15? I am not an electrician but am overseeing the larger project. Any advise on this topic would be insightful for me.

 

[ScottWJ]

I have a relay enclosure that controls a contactor for a solar PV circuit. The relay enclosure has multiple test blocks and fuse blocks from the factory, and has 3 circuits going to the enclosure from the main panel. From the house panel, there is a 3 pole breaker for the relay voltage sense, a single pole breaker for the power supply to the relay, and another single pole breaker that powers the normally open contactor that the relay controls. Do all 3 of those breakers ( 2 single pole, and 1 three pole) need to disconnect at the same time in the house panel per NEC 240.15? I am not an electrician but am overseeing the larger project. Any advise on this topic would be insightful for me.

Control panels can have multiple sources of power that do not disconnect simultaneously. At a minimum, see 409.110(3) for marking requirements for such panels.