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Over Temperature Fuses: Reliable OT-F and OT-S Solutions from China Suppliers and Factory
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Over Temperature Fuses: Reliable OT-F and OT-S Solutions from China Suppliers and Factory

Overtemperature fuses are essential safety devices designed to protect electrical equipment from overheating. In China, suppliers offer two main types of overtemperature fuses: OT-F (one-time fusible temperature fuse) and OT-S (resettable thermal switch). The OT-F fuse is engineered to permanently disconnect the circuit when the temperature exceeds a specified limit, making it ideal for applications where a single failure point is acceptable. This type of fuse is commonly utilized in various settings, including LED lighting, transformers, electronic components, large and small household appliances, electric heating appliances, and motors. Once the OT-F fuse has blown, it requires replacement to restore functionality, In contrast, the OT-S fuse functions as a resettable thermal switch that interrupts the circuit when temperatures rise above a pre-defined threshold. Once the temperature drops back to a safe level, the OT-S automatically resets, allowing the circuit to reconnect without needing a replacement. This convenience makes OT-S fuses especially ideal for applications such as LED lighting, transformers, motors, batteries, hair dryers, heaters, ovens, and chargers. When sourcing quality overtemperature fuses, look for reputable factories in China that specialize in these crucial safety components.

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    Product Detail

    ZZ3
    BTT Series Thermal Fuse
    Product Description

    When fuse body and its ambience temperature rises to the melting point of the organic compound, the compound changes from solid state to liquid state. Under the action of spring elasticity, the contact is pushed off to cut off the current.

    Product Characteristics
    • Product of organic compound type
    • Temperature band is rich (73–240°C)
    • Accurate action temperature
    • Not recoverable
    ZZ5
    BTA Series Thermal Fuse
    Product Description

    When fuse body and its ambience temperature rises to the melting point of the thermal fuse, the alloy is spherical fused under the surface tension of flux, cutting off the circuit and playing a protective role.

    Product Characteristics
    • Environmentally fusible alloy type
    • Plastic case
    • Accurate action temperature
    • Not recoverable
    ZZ2
    KSD02 Thermal Protector Series
    Product Description

    Temperature Rise: Heat is transferred to bimetallic strip to reach the operating temperature value, and the contacts are disconnected.
    Temperature Drop: Bimetallic strip quickly restored to original state, contact closed and circuit connected.

    Product Characteristics
    • Small size, easy for installing
    • PBT case, metal case, epoxy seal
    • Auto reset bimetallic strip, usage count more than 10,000 times
    • Moistureproof, dustproof, anti soaking paint
    • Superior thermal response, double protection for current & temperature
    • Customized based on customers' requirements
    ZZ4
    ATM Thermal Cut-Out Series
    Product Description

    When the temperature of the protected electrical apparatus rises, the heat generated is transferred to the bimetal sheet element. When the predetermined operating temperature is reached, the bimetal sheet element acts quickly, pushing the moving contact to disconnect the contact, thereby cutting off the circuit. When the temperature drops to the rated reset temperature, the bimetal sheet element automatically restores the circuit to be connected.

    Product Characteristics
    • Max operation current 16A
    • 100,000 times long life
    • Quick action
    • Superior thermal response
    • Ceramic high temperature resistant bracket
    Frequently Asked Questions
    Q What is the difference between BTT and BTA Series Thermal Fuses?
    The BTT Series uses an organic compound that transitions from solid to liquid state at the rated temperature, with a spring mechanism to cut off the circuit. The BTA Series uses an environmentally fusible alloy that spherically fuses under surface tension of flux. Both are non-recoverable (one-time use), but the BTA Series features a plastic case and an alloy-based mechanism, while the BTT Series covers a wide temperature band from 73°C to 240°C.
    Q Can thermal fuses be reset or reused after activation?
    No. Both the BTT Series and BTA Series thermal fuses are non-recoverable devices. Once they are triggered by an over-temperature condition, they permanently cut off the circuit and must be replaced. In contrast, the KSD02 Thermal Protector and ATM Thermal Cut-Out Series are auto-reset devices that restore the circuit once the temperature drops to the rated reset level.
    Q How many operating cycles can the KSD02 Thermal Protector handle?
    The KSD02 Thermal Protector Series is built with an auto-reset bimetallic strip that supports more than 10,000 usage cycles. This makes it highly suitable for applications requiring repeated thermal protection without the need for component replacement.
    Q What is the maximum current rating for the ATM Thermal Cut-Out Series?
    The ATM Thermal Cut-Out Series supports a maximum operation current of 16A. It is designed for long service life of up to 100,000 operations and features a ceramic high-temperature resistant bracket, making it ideal for demanding industrial and household electrical applications.
    Q What protection features does the KSD02 Thermal Protector offer?
    The KSD02 Thermal Protector provides double protection for both current and temperature. It is also moistureproof, dustproof, and coated with anti-soaking paint for enhanced durability. Available in PBT case, metal case, and epoxy seal configurations, it can be fully customized to meet specific customer requirements.
    Q What types of applications are these thermal protection products suitable for?
    These thermal protection products are widely used in household appliances, electric motors, transformers, heating equipment, and various industrial electrical devices. Thermal fuses (BTT and BTA) are ideal for one-time over-temperature protection, while the KSD02 and ATM series are suited for applications requiring automatic reset and repeated thermal protection over the product's lifespan.