MARS 39042 Limit Switch 318518-761 Always verify the serial number

Always verify the serial number of your Lochinvar boiler before purchase to ensure part compatibility

This specific desiccant blend provides superior refrigerant filtration by neutralizing hydrofluoric and hydrochloric acids while trapping solid contaminants down to 20 microns

Direct OEM Compatibility: Engineered specifically for ICP brands

Common Questions Is the S1-025-41333-000 compatible with all York air handlers

MARS 39042 Limit Switch 318518-761 Always verify the serial numberThe MARS 39042 is a professional grade Manual Reset Limit Switch designed for high temperature safety across commercial and residential HVACR systems. This SPST (Single Pole Single Throw) switch is engineered to open on temperature rise at a fixed 240F cut out temperature, providing a critical secondary safety layer for furnace plenums and air handling units. Operating within a 120 240V rating and supporting 5 to 10 Amps, it replaces standard 3 4 inch