Siemens Industrial Controls 3RH2921-1DA20 Switch R-22 the CK-41F provides the necessary

the CK-41F provides the necessary draft proving functionality required by code to prevent backdrafting and ensure proper flue gas evacuation in residential and light commercial atmospheric gas applications

Durable Construction: Features a corrosion-resistant aluminum body and dependable Buna-N elastomer seals

connect to the HIGH side and leave the LOW side open

the included CL2P-rated cable is specifically designed for use in plenum spaces

Siemens Industrial Controls 3RH2921-1DA20 Switch R-22 the CK-41F provides the necessaryThe Siemens SIRIUS 3RH2921 1DA20 is a high performance lateral auxiliary switch designed specifically for side mounting on size S0 and S2 contactors. This 2 pole block features a 2NO (Normally Open) contact configuration, providing reliable signaling and control circuit expansion for 3RT2 power contactors and 3RH2 contactor relays. Engineered for heavy duty industrial and HVACR environments, the 3RH2921 1DA20 utilizes secure screw terminals to ensure