Supco SHL250 Thermostat Limit Control

The Supco SHL250 Limit Control Thermostat is an electrical switch used to regulate and protect equipment from excessive heat conditions. It operates as a high-limit control that opens the electrical circuit when temperature rises to a preset threshold, installed within air handlers, and duct heating units in commercial HVAC systems. It is mounted in the air stream or plenum to monitor internal temperatures. Within the system, it operates as a protective control in series with the heating circuit, ensuring safe operation by interrupting power when thermal limits are exceeded and automatically restoring the circuit after conditions return to normal.