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Small black and silver thermal switch with metal disc and two terminals

Unique-Bargains

Unique-Bargains KSD301 45°C 113°F normally closed thermal switch

SKU CH-9RJG-MZJW2 MPN KSD301

A normally-closed thermal switch that opens at 45°C / 113°F and automatically resets when the temperature falls to about 30°C / 86°F

  • Opens at 45 °C / 113 °F to protect against overheating
  • Automatically resets when temperature drops to 30 °C / 86 °F
  • Normally closed contact keeps circuit active until limit is reached
  • Suitable for appliances such as irons, coffee makers and water heaters
  • Compact 6 g design fits tight mounting spaces

45 °C normally closed thermal switch

The Unique-Bargains KSD301 is a bimetallic thermostat that breaks the circuit when its mounting surface reaches 45 °C (113 °F). It suits appliances and heating equipment that need a simple over-temperature cut-out.

Automatic reset after cool-down

The contacts stay open until the surface falls to roughly 30 °C (86 °F), then close again without user intervention. This cycle repeats indefinitely, so the device protects continuously during sustained or recurring heat events.

Replaces fixed 45 °C NC thermostats

It drops into designs that specify a normally closed switch at this exact trip point. The jump is worth it only when the original part has failed or when a design calls for 45 °C operation; other temperatures require a different model.

Highlights

  • Opens at 45 °C / 113 °F to protect against overheating
  • Automatically resets when temperature drops to 30 °C / 86 °F
  • Normally closed contact keeps circuit active until limit is reached
  • Suitable for appliances such as irons, coffee makers and water heaters
  • Compact 6 g design fits tight mounting spaces

Specifications

BrandUnique Bargains

Questions about this item

Does the KSD301 generate any heat or noise when it cycles at 45 °C all day?

The switch is a passive thermal device with no moving parts, so it produces no audible noise and negligible self-heating during operation.

What wiring or mounting hardware must I already have to install this normally-closed thermostat?

You need two wire leads and a way to fasten the metal case firmly against the surface you want to monitor so heat transfers properly.

Will the 30 °C reset point work reliably with older heating elements that run cooler than modern ones?

Yes, the switch automatically closes again once the surface drops to roughly 30 °C, regardless of the element’s age or design.

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