The Sensata LELK1-1REC4-27129-919 is a low-energy limit control switch. It is designed for use on residential or commercial HVAC systems and has a pre-programmed limit set point of 70F. The switch triggers the heater/air conditioner when the ambient temperature falls below or rises above the set point. This switch is rated for 220V and has a maximum contact rating of 1A. Additionally, the switch is UL Listed and CSA Certified.