SL7-BL120-A is a type of Eaton company's lighting contactor relay. It is part of the SL7 series of lighting contactors that offer EN/IEC 60947-4-1 international standards for up to 600V operating voltage and 20A current rating. The specific part, SL7-BL120-A, is a one-pole type lighting contactor with basic ACL (ac/dc sensing) and a 120/277V 50/60 Hz operating voltage. It features a modular design for easy wiring, and it comes with a built-in fuse protected normally open auxiliary contact, an electrically-held hold-in contact, and an AC coil. It is UL, CSA, and CE certified, and is suitable for controlling the power to lights and other devices in residential or commercial applications.