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SEFUSE Thermal Fuses

SEFUSE thermal fuses from Schott Corporation are one-time, non-resettable, temperature-sensitive devices that provides ultimate thermal protection in electrical or electronic circuits.  These one-shot thermal fuses are mainly defined by their temperature setting but also by their current rating, which is the maximum continuous current that can be applied.  They are designed to protect both industrial and consumer electrical equipment from overheating, and cutting off the electrical circuit immediately

Thermal fuses are ideal for protecting small household appliances such as coffee machines, electric irons, hair dryers and stylers, refrigerators and fan heaters.  They also thermally protect battery packs and battery chargers, power supplies and automotive applications such as blower motors, fan speed dropper resistors and solenoids.

SEFUSE thermal cut-offs are highly reliable, offering a range of temperature ratings from 70°C to 240°C whilst handling loads up to 15A/250VAC.  Our thermal fuses carry all major agency approvals such as BEAB, UL, CSA, VDE (to the latest IEC 60 691/EN 60 691 standards) helping speed your own product approval accordingly.

How do Sefuse thermal fuses work?

  • Sefuse offer a simple cost-effective solution for thermal temperature management, with a fusible alloy inside an insulated case.
  • SF range -housed within a metal casing, the thermal pellet responds to abnormal high temperatures and triggers the cut-off function, as shown in the diagram below.
  • The Sefuse SM range operates using a fusible ceramic case, which enables it to be fixed directly to where the temperature monitoring is required.

Call us today on 01606 871680 to discuss your application’s thermal sensor requirements.  Using our extensive technical knowledge and innovative supplier base, we will work with you to provide the optimum solution for your product.

  • Range of Sefuse thermal fuses available from ATC Semitec
    SEFUSE SF-R One Shot Thermal Fuse

    The SEFUSE SF-R thermal fuse is the smallest 15A rated one-shot fuse available worldwide.  It has replaced the larger SF-E type but still has the same contact rating and settings up to 240deg.C.

    • Smaller fuse body; 4 x 8.5mm long – faster response time
    • Temperature range; 70°C to 240°C
    • 15A/250VAC Contact Rating
  • SEFUSE SFH-R Ultra Reliable One Shot Thermal Fuses
    SEFUSE SFH-R Ultra Reliable One Shot Thermal Fuses

    Ultra reliable one-shot thermal fuse, preventing electrical appliances from catching fire due to overheating.  The polymer-based pellet is less susceptible to premature aging.

    • Small fuse body: 4 x 8.5mm
    • Temperature range: 110°C to 176°C
    • Contact rating: 15A/250VAC
  • SEFUSE SM-A Ceramic One Shot Thermal Fuses
    SEFUSE SM-A Ceramic One Shot Thermal Fuses

    The SM-A is a general purpose one shot thermal fuse, using a fusible alloy inside a ceramic case.  Batteries, electric motors, transformers and solenoids all benefit from fitting this safety fuse.

    • Isolated Ceramic Fuse Body: 2.5 x 9mm long
    • Temperature Range: 72°C to 225°C
    • Maximum Rating: 2A/250VAC (also 50VDC ratings)
  • SEFUSE SM-B Small Thermal Fuses
    SEFUSE SM-B Small Ceramic Thermal Fuses

    The SM-B has a smaller ceramic fuse body compared to our SM-A thermal fuse, with a neat ceramic case encapsulating the fusible alloy.  Suitable for the smallest of coil winding applications.

    • Ceramic Fuse body: 2 x 6mm
    • Temperature range: 92°C to 225°C
    • Rating: 1A/250VAC (also 50VDC ratings)
  • SEFUSE SF-K Slim Thermal Fuses
    SEFUSE SF-K Slim Thermal Fuses

    The SEFUSE SF-K one-shot thermal fuse is the smallest of our metal-body fuses.  It uses a eutectic thermal pellet as its temperature sensing element which melts at its predetermined setting.

    • Slim metal fuse body: 3 x 7.5mm
    • Temperature range: 70°C to 214°C
    • Rating: 6A/250VAC
  • Sefuse D6SC Ultra Thin SMD Logic Fuse
    SEFUSE D6SC Ultra Thin SMD Battery Logic Fuse

    The D6SC series of battery logic fuses provides valuable overcharge and over-current protection, making them ideal for the protection of Li-ion battery packs.

    • Miniature space-saving surface mount logic fuse with built-in resistor
    • Ultra-thin fuse body: <1mm thin, 3 x 4mm land area
    • Ratings: 12A & 15A (20A, 30A, 45A and 60A versions also now available)
  • SCHOTT SEREB SB Battery Protector, miniature battery protection, Li-ion cells, bimetal thermal element
    SCHOTT SEREB Miniature Self-Hold Battery Protectors

    Schott’s SEREB series is a range of self-hold, miniature battery protection devices for use with Li-ion cells and other battery technologies.  Responds to both over-current and over-temperature conditions.

    • Self-latching protector – will not auto-reset whilst fault is present
    • Only 1.05 mm thick x 11.4mm long
    • 4 calibrations available from 72°C to 85°C