Schneider Electric Square D H366NR Safety Switch

Schneider Electric Square D H366NR is a heavy-duty fusible safety switch (safety disconnect) rated for up to 600 A and 600 V AC/DC, designed to protect large motor circuits and feeders in industrial settings. This 3-pole, 4-wire unit includes 1 neutral and accepts Class H or Class K fuses, enabling reliable protection for drives up to 500 HP at 600 V. The enclosure is galvanized steel with a NEMA 3R rainproof design that supports indoor or outdoor installation in harsh environments, delivering weather resistance for exterior switchgear bays and exposed plant areas. The H366NR is part of Square D’s family of heavy-duty safety switches and is a common choice for isolating large motors, pumps, conveyors, and other high‑power loads in commercial and industrial facilities. Built for rugged service, it combines secure, code-compliant disconnection with straightforward field wiring, helping maintenance crews safely de-energize equipment during servicing.