Harmony Plug in Relays is a complete range of general purpose industrial relays, sockets and accessories. Harmony plug in relays optimize design flexibility, expedite installation and simplify maintenance with 8 to 30 A load ratings, multiple contact combinations, a wide range of coil voltages, and full feature covers. The Harmony plug in relays have a test button which allows users to check circuits for proper operation. They have lock down door holds contacts in place to test circuits during maintenance. A standard mechanical flag indicates relay status. An optional bipolar LED indicates operation when relay is energized. Most of these relays plug into a relay socket that can be DIN rail mounted or panel mounted. Harmony plug in relays are UL Listed. "It enables easy installation and connect to relay from its socket." "Workability for hard-wired logic automated systems to complement the functions of industrial programmable logic controllers (PLCs)." 0 0 0 0 0 0 0 0 0