UL KSD301 Thermostat Switch for 40°C/104°F On, 30°C/86°F Off, N.O Snap Disc, 125V 16A Auto Reset, 2 pcs

The KI31/KSD301 Normally Open Limit Thermostat Switch is a temperature control/overheat protection device commonly used in various applications such as fireplace fans/blowers, wood stoves, and other heating equipment. This thermal switch features a normally open (NO) action type, operating on AC110V/120V/125V/250V/16A or DC12V/24V/48V/20A.

The switch's operating temperature range is 40°C to 50°C (104°F to 122°F), with a temperature accuracy of ±3°C. It boasts a contact resistance of ≤50MΩ and an insulation resistance of ≥100MΩ, ensuring reliable performance. The switch has a lifespan of approximately 100,000 cycles and can withstand an electrical strength test of AC 50Hz 1800V for 1 minute without any flickering or breakdown.

In terms of physical dimensions, the thermostat switch measures 1.34" x 1.18" x 0.47" (LWH), with a mounting hole spacing of 23.8mm (0.937 inches) and a pin width of 6.3mm (0.25 inches). The package typically contains 2 pieces of the KSD301 Normally Open Thermostat Switch.

It's important to note that KSD301 and KI31 are the same 1/2 inch thermostat, but their naming conventions may differ. The KSD302/KSD303/KSD201/1NT/TK 24/36T /US-118 /T11 and other similar models are all interchangeable, as they share consistent performance characteristics.

When installing this thermal switch, it's crucial to follow the proper precautions. Before starting, unplug the household appliance and completely cut off the power supply. Take a reference photo to ensure the correct restoration of the original setup. The temperature controller is a series circuit, not a parallel one, so the installation must adhere to the original product's circuit design. Avoid collapsing, loosening, or deforming the cover surface during installation to prevent any impact on the switch's performance.

Ensure the screw holes are properly locked, and the bracket is fixed in place to prevent tilting, which could lead to temperature control aluminum cover deformation and parameter changes. For safety, the wire terminal connections should be insulated and closed. Prevent any liquid from penetrating the thermostat's interior or cracking the housing.

The thermostat should be stored in a warehouse with relative humidity less than 90% and an ambient temperature below 40°C, with proper ventilation and a clean, dry environment.

The KI31 and KI32 rapid action thermal fuse limiters are widely used in instant hot water dispensers, faucets, dishwashers, and other thick film heating products. The KSD301 thermal cut-off switch is known for its reliability, sensitivity, and stable action temperature, finding applications in various equipment, including fans, wall heaters, wood stoves, refrigerators, greenhouses, electric control cabinets, high-temperature refrigeration fans, cameras, street lamps, transformers, and more.

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