{"product_id":"ksd-01f-temperature-switch-thermostat-thermal-protector-to-220","title":"KSD-01F Temperature Switch Thermostat Thermal Protector TO-220","description":"\u003ch2\u003eKSD-01F Thermal Protector Temperature Switch – TO-220 Package\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eKSD-01F Temperature Switch Thermostat\u003c\/strong\u003e is a compact, reliable bimetallic thermal protector designed for electronics, appliances, motors, and DIY projects requiring precise over-temperature control. With a wide operating range of \u003cstrong\u003e40°C to 150°C\u003c\/strong\u003e, this versatile component is available in both Normally Open (NO) and Normally Close (NC) configurations, making it suitable for a broad range of thermal management applications.\u003c\/p\u003e\n\n\u003cp\u003eHoused in the industry-standard \u003cstrong\u003eTO-220 package\u003c\/strong\u003e, it installs easily onto PCBs, heat sinks, or directly onto components that need temperature monitoring. Whether you're building a temperature-controlled circuit, protecting a motor winding, or adding thermal cutoff protection to a custom device, the KSD-01F delivers consistent and dependable performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Temperature Range:\u003c\/strong\u003e 40°C – 150°C, available in multiple set-point options\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Open \u0026amp; Normally Close:\u003c\/strong\u003e Choose the configuration that suits your circuit design\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTO-220 Package:\u003c\/strong\u003e Industry-standard form factor for easy integration and mounting\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBimetallic Disc Design:\u003c\/strong\u003e Fast, automatic thermal response with no external power required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Durable:\u003c\/strong\u003e Robust construction suitable for both prototyping and production use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomatic Reset:\u003c\/strong\u003e Returns to original state once temperature drops below the set threshold\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Applications:\u003c\/strong\u003e Motors, transformers, battery packs, PCB assemblies, home appliances, 3D printers, and more\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e KSD-01F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e 40°C to 150°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Type:\u003c\/strong\u003e TO-220\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Normally Open (NO) \/ Normally Close (NC)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 piece\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × KSD-01F Thermal Protector Temperature Switch (TO-220)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cp\u003eFor other precision tools and electronic accessories, check out our \u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e or the \u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e for your workshop or electronics bench.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between Normally Open (NO) and Normally Close (NC) on the KSD-01F temperature switch?\u003c\/h4\u003e\n\u003cp\u003eA: A Normally Open (NO) KSD-01F switch remains open (no current flow) at temperatures below the set point and closes (allows current) when the temperature reaches the threshold. A Normally Close (NC) switch does the opposite — it stays closed at lower temperatures and opens the circuit when the temperature rises to the set point. Choose NO for circuits that activate at high temperature, and NC for circuits that cut off power at high temperature (e.g. thermal protection).\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use the KSD-01F thermostat switch in a 3D printer or motor winding application?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The KSD-01F in a TO-220 package is widely used in 3D printer hotend assemblies, motor winding protection, transformer thermal control, and battery pack management. Its compact size and flat mounting surface make it easy to attach directly to heat-generating components with thermal adhesive or a mounting clip.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this thermal protector reset automatically?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the KSD-01F features automatic reset functionality. Once the temperature drops back below the rated set-point temperature, the bimetallic disc returns to its original position and the switch resets — no manual intervention required. This makes it ideal for continuous protection in automated systems.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between Normally Open (NO) and Normally Close (NC) on the KSD-01F temperature switch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A Normally Open (NO) KSD-01F switch remains open (no current flow) at temperatures below the set point and closes (allows current) when the temperature reaches the threshold. A Normally Close (NC) switch does the opposite — it stays closed at lower temperatures and opens the circuit when the temperature rises to the set point. 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Once the temperature drops back below the rated set-point temperature, the bimetallic disc returns to its original position and the switch resets — no manual intervention required. 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