Switch Disconnector for Load-Break Isolation
It provides visible-break isolation for a downstream load, but carries no overload or short-circuit protection — that is, no trip unit inside.
What the 400 A Rating Means for Fit
The 400 A continuous rating is the maximum uninterrupted current the disconnector can carry in free air at the rated ambient temperature. Because this is a switch disconnector — not a molded-case circuit breaker — it is designed for infrequent load-break switching and isolation, not for repetitive motor starting or fault interruption. The absence of overload or short-circuit protection means an upstream protective device (fuse or circuit breaker) must coordinate with this switch to clear faults.
This switch disconnector mounts in a panel or enclosure on the IEC frame 400 footprint. The nut keeper kit simplifies main-circuit terminal torquing during panel build — the keeper holds the nut in place while the bolt is driven from the front, a time-saver on a 400 A connection. The UVR coil wiring terminates at the control voltage source; verify the coil is rated for the same AC supply as the panel's control transformer (208-230 V AC).