Siemens Industrial Controls 3RH1921-1CA10 1-N/O Auxiliary Contactor

The Siemens Industrial Controls 3RH1921-1CA10 1-N/O Auxiliary Contact Block provides an electric part that is used in HVAC systems to add a supplementary switching contact that closes and opens with an underlying switch. It is mounted on motor starters, contactors, and control relays in air handlers, chillers rooftop units to pass status signals to control boards or interlock circuits. This is used by adding more feedback or control capabilities without modifying the main by increasing contact capability. It provides a coordinated logic and dependability of the equipment operation.