Precision Thermal Bimetal Discs

  Precision thermal bimetal components are widely used in home appliances, automotive, industrial and aerospace equipment. They convert temperature changes into mechanical motion to achieve switching, protection and regulation with high stability and long service life.

 

What Are Thermal Bimetal Components

  A thermal bimetal is a composite material made by bonding two or more metal layers with different thermal expansion coefficients. When heated, the high-expansion layer stretches more, making the component bend or flip. This predictable and repeatable action works as a switch or actuator without power or electronics.

 

 

Key Specifications

    1. Disc diameters: 11.0, 12.7, 16.0, 17.0, 19.0, 25.4 mm

    2. Operating temperature: -50°C to +280°C (customizable)

    3. Temperature tolerance: ±1°C to ±2°C

    4.Mechanical life: >150,000 cycles

 

Core Performance Parameters

    1. Specific curvature: Bending sensitivity per degree, determines response speed.

    2. Temperature range: Linear range for precise control; allowable range for safe operation.

    3. Electrical resistivity: For current-heated components such as overload protectors.

    4. Elastic modulus: Output force to reliably open and close switches.

 

Snap-Action vs. Creep-Action

  Creep-action means gradual bending, commonly used in bimetal strips.

  Snap-action means the domed disc inverts quickly at a set temperature. It avoids arcing and contact welding, making it ideal for safety devices.

 

 

Main Applications

  Home Appliances

    Used in electric kettles, irons, refrigerators, ovens, toasters and coffee machines for auto shut-off and temperature control.

  Automotive & EV

    Provide battery thermal runaway protection, HVAC actuation and seat heating overheat protection. They work as a mechanical backup when BMS fails.

  Industrial & Power

    Applied in overload relays, circuit breakers, motor protection and industrial control systems.

  Aerospace & Medical

    Used in sterilization equipment, aviation de-icing and environmental control systems in high-vibration environments.

  Market Trends

    The global thermal bimetal market grows at about 6.4% CAGR. Growth is driven by energy efficiency, smart home fail-safe design and device miniaturization. Demand from EVs and compact appliances is increasing rapidly.

FAQ

  1.Bimetal strip vs. disc

    Strips use gradual creep-action; domed discs provide fast snap-action for secure switching.

  2. Can tolerance reach ±1°C?

    Yes, with specific alloy combinations and precise calibration.

  3.Lifespan

    Over 150,000 cycles, often decades in daily-use appliances.

  4.Above 280°C?

    May cause permanent deformation. Special high-temperature alloys are needed for temperatures above 450°C.