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This furnace limit switch is engineered to deliver reliable thermal protection and seamless integration into residential heating systems. Acting as a critical safety component, it monitors furnace temperature and automatically disconnects the burner when unsafe heat levels are detected, preventing equipment damage and mitigating fire risks. The switch’s precision calibration ensures consistent performance across varying operating conditions, restoring optimal safety to aging or faulty furnaces. Crafted for universal compatibility, it replaces worn-out switches in most gas, electric, or oil-based systems. The compact yet rugged construction utilizes heat-resistant alloys and ceramics to withstand temperatures exceeding standard operational limits, ensuring longevity even in high-stress environments. Installation is streamlined for DIY efficiency: disconnect the existing wiring, remove the mounting screws, align the new switch, and reconnect the terminals—typically completed within minutes. The hermetically sealed design prevents dust infiltration and moisture damage, reducing maintenance needs. Homeowners will appreciate its role in eliminating erratic shutdowns, uneven heating, or burner failure caused by degraded switches. For HVAC technicians, it offers a cost-effective solution to extend furnace lifespan without full system replacements. This component is indispensable for maintaining safe, efficient home heating—ideal for those prioritizing system reliability and proactive hazard prevention. Function:A limit switch is a safety device designed to shut down a piece of equipment. Limits have a set point, which is in some cases, adjustable. The set point prevents the temperature or pressure from exceeding the rating of the switch. Universal Compatibility: Designed to fit most residential furnaces for effortless replacement without modifications. Robust Thermal Endurance: High-grade materials resist warping or failure under extreme continuous heat exposure. Simplified Installation: Direct replacement with standard wiring connections, requiring no specialized tools. Safety-Driven Function: Prevents system overheating and potential fire hazards by interrupting circuit at critical temperatures. Model L140-10F Terminal Blade Brand Name Generic Part Number L140-10F Switch Type Bipolar Transistor Circuit Type 1-way Contact Type Normally Closed Manufacturer Generic Material Type Acrylonitrile Butadiene Styrene Mounting Type DIN Rail Mount Connector Type Clamp Current Rating 0.01 Amps Operation Mode OFF-NONE-ON Item Dimensions 0.01 x 0.01 x 0.01 inches Number of Items 1 Contact Material Alloy Steel Operating Voltage 0.01 Volts Specification Met ANSI C-73 Included Components L140-10F Furnace Single Pole Snap Disc Limit Switch Number of Positions 1 Warranty Description 30 day warranty Lower Temperature Rating 0.01 Degrees Celsius Upper Temperature Rating 0.01 Degrees Celsius International Protection Rating IP00