Carrier HH18HA517 Limit Switch

Carrier HH18HA517 is an essential safety switch utilized in HVAC systems. It works as a limit switch, which will stop the system when high or low set temperatures have been achieved. It shields the system from overheating which would result in failure of components within the set and may even act as fire hazards. In the air handling unit or furnace, there is a limit switch that contains a spring-loaded mechanism that triggers temperature change. When the temperature rises to a certain threshold, the spring mechanism opens and cuts off the electrical circuit, hence stopping the system.