SWT3987 | 180F M/R Rollout Switch | Trane

180F M/R Rollout Switch [SWT3987] Trane The SWT3987 is a 180F M/R Rollout Switch manufactured by Trane. This switch is designed to protect your HVAC system from overheating by shutting off the system if the temperature rises too high. The SWT3987 is a reliable and durable switch that is easy to install and maintain. This Trane rollout switch is commonly used in commercial and industrial HVAC systems. It is a single-pole, double-throw switch with a normally closed (NC) contact and a normally open (NO) contact. The switch is actuated by a bimetallic coil that expands or contracts with changes in temperature. When the temperature rises to a predetermined set point, the bimetallic coil trips the switch, opening the NC contact and closing the NO contact. This breaks the circuit to the HVAC system, shutting it off. Our HVAC supply store offers the SWT3987 rollout switch at the lowest price with fast shipping!