The switch supports 120V-277V AC electrical loads and features 1/4" NPT high-pressure and 1/8" NPT low-pressure inlets for robust sampling line connections

and flame sense (S1/FC) align with your actual equipment layout

ensure your specific application requires the L210-40 setting

Universal Versatility: Standard 3/4" snap disc mounting holes and included terminal adapters allow for rapid installation across multiple brands

System Sensor 2151 Smoke Detector Els PW 17895 The switch supports 120V-277V ACThe System Sensor 2151 is a professional grade, low profile photoelectric smoke detector designed for precise performance in commercial HVAC and fire alarm systems. This 100 Series plug in head utilizes a state of the art optical sensing chamber and is engineered to provide stable detection in diverse environments. Technicians should note that this unit is the direct replacement for 2151+ and the 70 540000 001 models, ensuring seamless integration