{"id":1570,"date":"2026-05-29T15:25:45","date_gmt":"2026-05-29T07:25:45","guid":{"rendered":"..\/..\/..\/..\/index.html\/?p=1570"},"modified":"2026-05-29T15:25:51","modified_gmt":"2026-05-29T07:25:51","slug":"ksd301-snap-action-temperature-switch","status":"publish","type":"post","link":"..\/..\/..\/..\/index.html\/ksd301-snap-action-temperature-switch\/","title":{"rendered":"KSD301 Snap-action temperature switch"},"content":{"rendered":"\n
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I. Overview KSD301 is the most versatile disc-shaped bimetallic snap-action thermostat switch, commonly known as “temperature protector\/thermostat”, featuring automatic reset, high current, and insulated housing, widely used in household appliances and industrial equipment.
II. Operating Principle \uf0b7 Core: The disc-shaped bimetallic strip senses temperature. When the temperature rises to the set value, it instantly snaps and deforms, triggering the contact action (opening\/closing).
Cool down to the reset temperature (about 10\u201330\u2103 lower than the operating temperature) \u2192 metal plate rebounds \u2192 contacts return to their original state, automatically resetting.
Contact form: Normally closed (NC) (default, disconnected upon overheating), normally open (NO) (connected upon overheating).
III. Model and Specifications (Commonly Used) \uf0b7 Example Model: KSD301 85\u2103 NC (Normally Closed, disconnects at 85\u2103).
Operating temperature: 30\u2103\uff5e250\u2103, commonly used: 55\/65\/75\/85\/95\/105\/120\u2103; every 5\u2103 as a step.
Temperature tolerance: \u00b12\u2103, \u00b13\u2103, \u00b15\u2103 (commonly used \u00b13\u2103).
Reset temperature difference: 10~30\u2103 (e.g. disconnect at 85\u2103 \u2192 reset at about 65\u2103).
IV. Electrical Parameters (Resistive Load) \uf0b7 Rated Voltage: 250VAC; 125VAC; 24VDC.
Rated current: 5A\/10A\/16A @250VAC; 15A @125VAC.
Contact resistance: \u226450m\u03a9.
Insulation resistance: \u2265100M\u03a9.
Voltage resistance: \u22651500VAC for 1 minute.
Lifespan: \u226510,000 cycles (AC).
Shell material: bakelite (\u2264160\u2103), PPS (\u2264220\u2103), ceramic (\u2264300\u2103).
V. Structure and Installation \uf0b7 Appearance: round piece + dual ear mounting holes, with a diameter of approximately 20mm, a thickness of approximately 4mm, and two foot inserts.
Installation: The metal surface should be tightly attached to the heating element (coated with thermal conductive silicone grease) and secured with M3 screws; the pins should be connected to terminals or soldered.
Features: small size, flexible installation, strong anti-interference, and no arcing.<\/p>\n\n\n\n

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  1. KSD301 vs KSD 01F (Key Differences)
    KSD301: dual-lug disc, high current (10\u201316A), wide temperature range (30\u2013250\u2103), a mainstay in home appliances.
    KSD 01F: TO 220 encapsulated, low current (1.5\u20133A), low temperature (\u2264150\u2103), commonly used in PCB\/power supply.<\/li>\n\n\n\n
  2. Typical Applications: Kitchen Appliances: Disinfection cabinets, electric kettles, rice cookers, microwave ovens, and electric ovens.
    Bathroom equipment: water heater, fan heater, bath heater.
    Industry \/ Power Supply: Overheat protection for frequency converters, motors, power modules, and high-power equipment.
    Others: water dispensers, clothes dryers, electric irons, car seat heaters.<\/li>\n\n\n\n
  3. Selection points 1. Contact type: normally closed (NC) (overheat disconnection, protection) or normally open (NO) (overheat closure, alarm).<\/li>\n\n\n\n
  4. Operating temperature: Select based on the maximum allowable temperature of the equipment (e.g., 85\u2103 is commonly used for water heaters).<\/li>\n\n\n\n
  5. Load current: Not exceeding 16A at 250VAC.<\/li>\n\n\n\n
  6. Shell material: For high temperatures (>160\u2103), choose ceramic or PPS; for low temperatures, choose bakelite.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    I. Overview KSD301 is the most versatile disc-shaped bimetallic snap-action thermostat switch, commonly known as “temperature protector\/thermostat”, featuring automatic reset, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1570","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"blocksy_meta":[],"_links":{"self":[{"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/posts\/1570","targetHints":{"allow":["GET"]}}],"collection":[{"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/comments?post=1570"}],"version-history":[{"count":1,"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/posts\/1570\/revisions"}],"predecessor-version":[{"id":1573,"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/posts\/1570\/revisions\/1573"}],"wp:attachment":[{"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/media?parent=1570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/categories?post=1570"},{"taxonomy":"post_tag","embeddable":true,"href":"..\/..\/..\/..\/index.html\/wp-json\/wp\/v2\/tags?post=1570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}