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
Siemens 3RH2921-1DA11 1-N/O-N/C Auxiliary Switch Block
Published on February 24, 2026
Published by Edison
Viewed by 2 people
Description of item
Location
Country
United States
Region
IL
City
Chicago
Address
700 Nicholas BLVD Suite 105 Elk Grove Village IL 60007
Seller information
Name
Edison
Phone
8667730XXX
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Location
Chicago in IL, United States
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