Siemens Industrial Controls 3RH1921-1EA20 2 N/O Side Mount Auxiliary Contacts

The Siemens Industrial Controls 3RH1921-1EA20 Auxiliary Contact Block is an essential component of an HVAC systems. Designed with two normally open contacts and installed on the side to add to its operates. The block works by making or breaking the auxiliary contacts each time the main contactor is switched on to provide other operations such as signaling, interlocking, or controlling other equipment. It is applied in systems, where it assists in controlling processes such as motor starters, pumps, and fans, among others, to operate effectively and accurately. The block structure makes the system compact, mechanically and simply install, and flexible in operation.