Siemens Combustion QRI2B2.B180B1 Flame Detector R-407A While the electrical contacts are

While the electrical contacts are typically SPST (Single Pole Single Throw) and reversible for simple switching

it offers reliable fail-safe operation when paired with compatible Schneider Electric actuators such as the SpaceLogic series

making it a reliable OEM replacement motor for direct drive blowers and exhaust fans

eliminating the need for shaft modifications or field adjustments during installation

Safety Logic Integration: The SPDT (Single-Pole Double-Throw) design allows for accurate monitoring of the normally-open and normally-closed states during the startup sequence

Siemens Combustion QRI2B2.B180B1 Flame Detector R-407A While the electrical contacts areThe Siemens QRI2B2. B180B1 is a high sensitivity infrared flame detector designed for the supervision of gas, oil, or coal flames in large scale industrial or commercial burner systems. Engineered for lateral (side viewing) illumination, it features a 90 degree light entry path, making it the standard choice for specific burner mounting configurations where frontal line of sight is obstructed. This self checking sensor operates within a 1 to 3 m