Description
The Marley Engineered Products 4520-2025-000 A/R High Limit Switch L180-40F is a temperature-sensing control applied in HVAC systems to detect excessive temperatures to control operation. It has a thermal element that is adjusted to trigger its electrical contacts when temperatures attain a set limit to terminate the control circuit and initiate a controlled action. This auto-reset switch in heat-prone areas is part of the wiring system, closes again when the temperatures have returned to normal. Heating aids in maintaining thermal protection in the normal process.
