Supco LD140 SPDT Limit Switch L140-20F

The Supco LD140 Limit Switch is a temperature control component that opens and closes an electrical circuit at a fixed temperature to enable and regulate equipment operation. Commonly installed in furnaces, air handlers, rooftop units and other HVAC systems, it monitors internal temperatures to support safe and consistent performance. With an L140-20F temperature rating and SPDT switching configuration, it responds automatically to changing heat conditions within the system. Its operation assists to manage heating cycles, protect internal electrical controls and maintain proper operating conditions across residential and commercial applications.