41.00 Dollar US $ · Siemens 3RH2921-1DA11 1-N/O-N/C Auxiliary Switch Block

Published date: February 24, 2026 12:27 pm

Location: 700 Nicholas BLVD Suite 105 Elk Grove Village IL 60007, chicago, IL, United States

The Siemens Industrial Controls 3RH2921-1DA11 Auxiliary Switch Block is a compact electrical accessory that provides one normally open (N/O) and one normally closed (N/C) contact for use with contactors and control devices in HVAC systems. It operates by changing contact states in response to the primary device’s actuation, enabling additional control or feedback functions within the control circuit. Typically applied in commercial and industrial air handlers, chillers, and control panels, this switch block enhances system flexibility, supports safety interlocks, and improves monitoring capabilities. Benefits include easier troubleshooting, improved automation integration, and enhanced operational reliability.

For an efficient and reliable HVAC system, the Siemens Auxiliary Switch Block is a great choice for optimal system performance.

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Visit The Website: https://www.partshnc.com/aux-switch-lateral-1no1nc

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