Contact Set: 3/0 – AN916

Sized to 3/0 conductor, this contact set supplies the mating current-carrying contacts that make and break a high-amperage connection, the wear surfaces that actually pass current each time the connection closes. In service they carry the full load current across their faces, so their condition governs how cleanly and how completely the connection conducts.

Contacts like these erode over time from the arc that forms every time they open under load. As the faces pit and burn, contact resistance climbs, the connection runs hot, and it eventually fails to carry full current, which can starve whatever the circuit feeds. Replacing the set restores clean, low-resistance contact faces and full current-carrying capacity.

The 3/0 designation indicates the conductor size and current class the contacts are built for, so match that rating along with the physical shape and mounting of the contacts to the set being replaced.