This fixed temperature switch is a direct replacement for legacy part number 42J0401

Key Benefits Enhanced Compatibility: Engineered to interface seamlessly with R4166

Does this base include a trim ring

built with a robust metal construction designed to withstand the high-cycle demands of industrial and residential furnaces or air handlers

Reduces the risk of ignitor damage caused by vibration or improper seating in the burner box

Lennox 45H83 Limit Switch This fixed temperature switch isThe Lennox 45H83 Limit Switch is a critical OEM replacement part engineered for high temperature thermal protection within residential and commercial HVAC systems. As an automatic reset limit switch, this component is factory calibrated to trip between 200F and 230F, effectively interrupting the electrical circuit to the burner or heating elements if internal temperatures exceed safe operating parameters. Designed for 24V or 240V control circuits,