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Resettable PTC Fuses

 

Our Semifuse PTCs, manufactured by Fuzetec are resettable current fuses based on conductive polymer PTC technology. These PPTC fuses will happily carry its rated “hold” current until it is exceeded. If an over-current condition occurs, the PTC heats up, the resistance rises rapidly and therefore limits the through current to safe levels.

The PTC will remain in this “off” state until the applied voltage is removed and the PTC has cooled down. The PTC effectively then “resets” to its pre-fault level ready to protect again.

Semifuse PTC fuses supplied from ATC Semitec, are available in a wide range of current values from 0.1A to 14A. with voltages ratings up to 240V and formats.

These fuses have been successfully used within a variety of industries but particularly within battery power supplies, and fire alarm panels.

All these Semifuse PTC resettable fuses are operational between -40°C to 85°C.

All carry UL, CSA and Tuv approvals, and are available as a low-profile “strap”; through-hole p.c.b. or SMD design.

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.

 

  • SEMIFUSE SFSR RESETTABLE PTC Fuse

    Our Semifuse SFSR  re-settable PTC fuse from Fuzetec will provide reliable, non-cycling protection against short circuits in rechargeable batteries and electronic circuits.

    • Current ratings 1.2A – 4.2A
    • Voltages – 15VDC to 30VDC.
    • With nickel straps for spot-welding directly onto battery cells.

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  • SEMIFUSE SFLR RESETTABLE BATTERY STRAP PTC Fuse

    Semifuse SFLR PTC fuses from Fuzetec are ideal for high-power battery applications, providing reliable non-cycling protection against over-charging and short-circuits.

    Semifuse SFLR PTCs have a lower resistance and a smaller mass giving faster trip times and improved battery protection.

    • Current ratings 1.9A to 9.0A
    • Voltages – 15VDC to 20VDC.
    • With nickel straps for spot welding directly onto battery cells
  • SEMIFUSE SFLT BATTERY STRAP RESETTABLE PTC Fuse

    Semifuse SFLT resettable PTC fuses from Fuzetec offer improved battery protection particularly in low-power battery applications. These PTC strap fuses provide reliable non-cycling protection against over-charging and short-circuits.

    The Semifuse SFLT series PTCs switch at lower temperatures, therefore giving them faster trip times, and making them ideal for the latest generation of battery designs.

    • Current ratings 0.7A – 3.4A
    • Voltages – 24VDC
    • With nickel straps for spot welding directly onto battery cells

     

  • SEMIFUSE SFVT ULTRA SLIM BATTERY STRAP PTC Fuse

    Semifuse SFVT resettable PTC fuses from Fuzetec are ideal for Li-ion battery protection.

    These are ultra-slim and have a 20% lower temperature trip compared to our standard series. They offer protection against over current and over temperature conditions.

    • Continuous currents 1.1A – 2.4A
    • Voltages  – 16VDC
    • With nickel straps for spot-welding directly onto battery cells.
  • SEMIFUSE SFR16F 16V RADIAL LEADED PTC Fuse

    Our Semifuse SFR16F series of resettable PTC fuses from Fuzetec provide short-circuit protection in automotive electronic circuits for short circuit currents up to 100A, and other low voltage DC designs.

    Ideal for replacing conventional one-shot current fuses.

    • Radial leads (fixings)
    • Current ratings 2.5A to 14A
    • Voltages – 16VDC
  • SEMIFUSE SFR30F 30V RADIAL LEADED PTC Fuse

    Our Semifuse SFR30F series of re-settable PTC fuses are ideal for use to protect battery chargers, computer peripherals, rechargeable batteries etc.

    They provide re-settable short-circuit protection in low-voltage DC circuits for short circuit currents up to 40A.

    • Radial leads (fixings)
    • Current ratings 0.9A to 9A
    • Voltages – 30VDC
  • SEMIFUSE SFR60F 60V RADIAL LEADED PTC Fuse

    Ideal for protecting power supplies, speakers, security and alarm systems, electric motors, etc.

    Our Semifuse SFR60F series of PTC re-settable fuses from Fuzetec provide re-settable short-circuit protection in low voltage DC circuits up to 60V for short circuit currents up to 40A.

    • Radial leads (fixings)
    • Current ratings 0.05A to 3.75A
    • Voltages – 60VDC
  • SEMIFUSE SFRV 240V RESETTABLE RADIAL LEADED PTC Fuse

    Our Semifuse SFRV 240V re-settable PTC fuses from Fuzetec are suitable for use with  transformers, electric motors and other electrical circuits, offering superior performance over conventional current fuses.

    • Radial leads (fixings)
    • Max operational current – 0.05A to 2.0
    • Max operating voltages – 240V AC/DC
  • SEMIFUSE SMD PTC Resettable Fuses (Surface Mount PTCs)

    Semifuse’s range of SMD PTC fuses is the most comprehensive available, with footprints as small as 0603 up to the largest at 2920,

    They offer a surface mount solution for motherboard, computer peripheral electronic application.

    Semifuse® SMD PTCs offer compact circuit protection for currents from 0.01A to 3A with voltages up to 60V.

    Ask for details on our new low resistance (Lo Rho) SMD PTCs, sizes from 0603 to 1812