or overheating the valve body during the brazing process

638-inch ID

extending the functional life of the contacts

making it the reliable choice for maintaining water-source heat pump integrity in commercial or residential geothermal applications

Siemens Industrial Controls 3RH2921-1DA11 Switch R-410A or overheating the valve bodyThe Siemens 3RH2921 1DA11 is a high performance lateral auxiliary switch block specifically engineered for the expansion of control circuit contacts. Designed for veterans in the field, this Sirius auxiliary contact features a robust 1NO + 1NC (1 Normally Open and 1 Normally Closed) configuration, providing essential feedback for motor control logic. Its side mount architecture allows for a space efficient 10mm profile, attaching seamlessly via snap