Leviton 7277-M3S 277 Volt 7 Mode Module Replacement for 3 Phase Wye 7-Mode Integral Disconnect 4-Wire and Grounding For installation at main distribution panels. Hybrid suppression circuitry with built-in redundancy provides complete protection on all phases Modular design allows easy replacement of modules Housed in NEMA-12 enclosure with hinged cover, surface or flush mountable Limited Lifetime Product Warranty