Thermal Fuse KSD301 120°C

Description

Product DescriptionThe KSD301 Snap Disc Bimetal Thermostat Switch (120°C variant) is a compact, fixed-temperature thermal safety cutout designed to provide overcurrent and overheat protection in standard consumer electronics and commercial appliances. Operating via a pre-calibrated bimetallic disc, the switch features a crisp “snap action” that instantaneously breaks or completes the electrical circuit when the mounting surface hits exactly $120^circtext{C}$ ($248^circtext{F}$).This specific unit is widely deployed as a Normally Closed (NC) configuration. Under normal working temperatures, the internal contacts remain closed, allowing electricity to pass through natively. If the appliance malfunctions or dry-burns, causing the temperature to spike to $120^circtext{C}$, the disc snaps shape to open the contacts and cut off power. Once the system cools back down (typically dropping $15^circtext{C} – 30^circtext{C}$ below the threshold), the switch automatically resets itself to restore connectivity.Key SpecificationsModel Designation: KSD301 / KSD301-R / KSD301A SeriesAction Temperature: $120^circtext{C}$ ($248^circtext{F}$) fixed factory calibration.Circuit Logic: Normally Closed (NC) — Opens on temperature rise, auto-resets on cool down.Voltage Rating: $250text{V AC}$ universal mains operation (also compatible with $125text{V}$ lines).Current Capacity: Standard $10text{A}$ continuous load resistance (Variants also exist up to $16text{A}$).Housing Material: Available in high-isolation Bakelite (black polymer) or high-temperature Ceramic styles.Terminal/Bracket Design: Loose/movable aluminum mounting flange with dual flat $6.3text{mm}$ ($1/4text{ inch}$) quick-connect spade terminals.Compatibility GuideThe KSD301 structure is a globally standardized engineering footprint. Rather than being restricted to a single brand, compatibility is determined by current limits ($10text{A}$), physical layout, and temperature matching ($120^circtext{C}$).1. Structural Footprint & Sub-ModelsThis 120°C thermostat can directly replace or intermate with equivalent lines from various electronics manufacturing groups, including:KSD301 Series Equivalents: Directly matches 120°C temperature cutout profiles produced by DollaTek, JJHXSM, jinwen, and Pentastara.Awozkcd / GE Series: Often cross-referenced as a high-limit thermal switch replacement inside kitchen appliances.Sensata Klixon / Elmwood equivalents: Fits the physical mounting layouts of premium automated thermal switches of the same temperature bracket.2. Common Applications & ProductsA $120^circtext{C}$ thermal threshold makes this component the ideal safety limit or cycling switch inside intermediate-heat appliances, such as:Kitchen Multi-Cookers & Steamers: Acts as the primary boil-dry protector or auto-shutoff sensor in household clothes steamers, steam cleaners, and water distillers.Microwave Ovens & Air Fryers: Positioned against magnetron housings or upper heating elements as a secondary high-limit safety cut-out fuse.Coffee Makers & Espresso Machines: Monitors boiler tank temperatures to prevent the heating elements from melting if the water reservoir runs dry.Water Dispensers & Heaters: Serves as the backup over-temperature cutoff switch on hot water tanks before steam expansion occurs.⚠️ Installation Tip: When installing, ensure the aluminum faceplate sits perfectly flat against the heat-source surface. Applying a micro-layer of thermal conductive grease to the mounting face significantly improves the response time of the bimetal disc, preventing delayed trips.