Siemens 3RH2921-1DA11 1-N/O-N/C Auxiliary Switch Block

The Siemens Industrial Controls 3RH2921-1DA11 Auxiliary Switch is an essential component of the HVAC systems. Designed with lateral mounting, which is used to add more contacts to the control circuit and one normally open and one normally closed contact, making it suitable for use in different industries for flexible connections. This switch can be applied in systems where it can perform such operations as fan start/stop or temperature control by connecting to contactors and relays. It turns on and off as required by the system operation. The product has better mechanical durability and is also protected.