Description
Product Description The KSD301 Snap Disc Bimetal Thermostat Switch (45°C Normally Open variant) is a compact thermal control switch designed to automatically trigger cooling systems or signal circuit activations when a specific temperature threshold is reached. Utilizing a pre-calibrated internal bimetallic disc, it operates via a sharp “snap action” that instantaneously closes the electrical circuit the exact moment the sensing surface or surrounding ambient air warms up to 45 ∘ C (113 ∘ F). This specific component is configured as Normally Open (NO), meaning that under standard, cool conditions, the internal contacts remain open and no current flows. When the device or enclosure heats up to 45 ∘ C, the disc snaps shape to shut the contacts and complete the circuit (activating a fan or alarm). Once the system cools back down below the threshold (typically by 10 ∘ C−15 ∘ C), the switch automatically resets to its open state. Key Specifications Model Designation: KSD301 / KSD301-G / KSD301B Series Action Temperature: 45 ∘ C (113 ∘ F) fixed factory calibration. Circuit Logic: Normally Open (NO) — Closes on temperature rise, auto-resets on cool down. Voltage Rating: 125V−250V AC universal operation. Current Capacity: Standard 10A continuous load resistance (Variants also exist up to 16A). Housing Material: High-isolation Bakelite (black polymer body) or high-durability Ceramic. Terminal Design: Dual flat quick-connect male spade lugs (6.3mm). Mounting Base: Loose or fixed aluminum retaining flange bracket with twin screw holes for surface alignment. Compatibility Guide The KSD301 footprint is a globally standardized engineering profile. It is cross-compatible across an array of heating, cooling, and automation platforms based on physical shape, current tolerance (10A/16A), and temperature calibration (45 ∘ C). 1. Alternative Sourcing Equivalents This component acts as a direct drop-in replacement for 45°C normally open snap disc switches manufactured or distributed by lines such as: DollaTek / Fielect Series: Frequently matches the 45°C auto-reset switch packs found on online marketplace networks. Uxcell / Sourcing map: Matches the standardized Bakelite and Ceramic 45°C bimetal configurations distributed across major electronic hardware catalogs. Industrial Supply Links: Readily available from specialized electronics suppliers like Lee’s Electronic Components or generic replacements on Amazon, eBay, and AliExpress. 2. Common Applications & Products A 45 ∘ C Normally Open threshold is ideal for low-temperature heat management, commonly serving as an essential part in: AV Equipment & Server Racks: Mounted near heat sinks or amplifiers to automatically turn on cooling exhaust fans when the internal cabinet ambient temperature reaches a warm 45 ∘ C. Power Inverters & Solar Chargers: Triggers built-in cooling systems to manage thermal performance before the primary power transistors overheat under heavy workloads. Automotive Accessory Cooling: Used in custom automotive electronics or 12V RV configurations to kickstart auxiliary ventilation. Overheat Warning Alarms: Acts as a low-threshold thermal sensor to activate a buzzer or indicator LED in sensitive electronics boxes before temperatures reach critical levels. ⚠️ Installation Tip: For maximum accuracy, ensure the aluminum cap of the thermostat is mounted perfectly flat against the heat-source surface. Applying a thin film of thermal paste (heatsink compound) under the cap significantly improves thermal transfer, minimizing response delays.
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