Surge-Trap® STXH series surge protective device with panel mounting. It is pre-wired with 18 In 10 AWG conductors connection terminal. Designed with the industry leading Mersen TPMOV® Technology. Compact footprint designed to mate with AC disconnect switches. LED status indicator (ON = good, OFF = replace). NEMA-4X enclosure for outdoor or indoor use. Fits 1/2 inch knockouts with 18 inch leads for easy installation. For use in ANSI/UL type-1 or 2 SPD installations. 3 modes of protection (L-N, L-L). Its compact size, performance and reliability are especially ideal for HVAC applications and direct mounting to air condition disconnect switches.