Specifications: switch type NC (normally closed), material PVC, operating temperature -20 - +80, wire length 5.8ft, switching voltage max; 200VDC; Switching current max; 1 A contact rating maximum 10WWorking Principle: the float switch HVAC can be connected to a VCC or thermostat line; It is an NC type (normally closed) switch: when no water overflows, the float stays at the bottom of the switch, the switch closes the loop and outputs an ON signal; When the water overflows, the buoyancy of the float rises, the trigger switch turns on, and the output OFF signal turns offHVAC Float Switch Function: SS2 water level switch is applied in HVAC systems to detect condensation water overflow; It detects blockage of air conditioning condensate water drain pipe and shuts down the system to prevent overflowing water from damaging floors, walls, and ceilingsEasy to Install: this float switch HVAC is easy to install, all you need to do is install the 3/ 4 adapter that comes with the AC float switch on the auxiliary drain outlet of the main panel and connect the 5.8ft of wire to VCC or thermostat wireEasy to Clean: the transparent material allows you to see what's going on inside; The float switch is equipped with a removable cover; When you use it for some time, you can remove it for cleaning to ensure hygiene and normal function