I am looking for a way to disconnect all the power within a 200A, 42-slot, panel board (supporting single phase, 208VAC). I have found a 3-pole relay that could handle 150A and I could connect the control side to a 7 day timer and install it in a separate NEMA 1 box BUT I was looking for something that would install within the panel board itself next to all the breakers. Does such a device exist?