543-200

Description

The 3-inch High Limit Switch L200-40F is a vital safety component designed for forced-air furnaces and HVAC heating systems. This high-temperature limit control acts as a safety sensor that monitors the heat exchanger or plenum temperature to prevent equipment overheating and ensure home safety. If your furnace is short cycling, failing to ignite, or the blower fan is running continuously, a faulty high-limit sensor may be the cause. This switch is precision-calibrated to open the electrical circuit when the internal temperature reaches 200°F, immediately shutting down the burner to prevent damage. It features an automatic reset, closing the circuit once the temperature cools by 40°F. Durable and reliable, this probe-style limit control is essential for maintaining the operational integrity of residential and commercial heating equipment.

Specifications

Type

High Limit Control Switch

Size

3-inch

Dimensions

3 inches

Application

Commonly used in gas and electric furnaces, air handlers, and HVAC units as a primary safety cutout to prevent thermal damage.

Specifications

Cut-out temperature: 200°F; Cut-in/Reset temperature: 160°F; 40°F differential; Automatic reset; 3-inch insertion depth.