556011 is a part of Littelfuse, a company that specializes in producing fuses, circuit protection, and other electrical components, including the 556 series of industrial power logic modules. This particular part is designed for switching, blocking, or logic functions with up to three single-pole/double-throw (SPDT) relays. According to the company’s website, the 556011 features three SPDT relays, each with a 10 A self-extinguishing contact rating and a 240 VAC switching capacity. It is also fully encapsulated (in polycarbonate) to provide good electrical insulation and protection against moisture and other elements. Additionally, the module has a voltage rating of 24 VDC which allows for it to be connected with a variety of types of equipment.