The ABB THN3365A1 is a Heavy Duty safety switch designed for commercial and industrial applications. It features a non-fusible, 3-pole configuration with a robust NEMA 1 indoor enclosure. Built for reliability and ease of installation, this switch is a dependable choice for demanding environments..This is a 3-pole, 400 Amp, 600 Volt AC non-fusible safety switch with a NEMA 1 enclosure. It supports a wire range of (2) 4-600 AWG copper or aluminum. The switch is UL and cUL listed and meets NEC standards.