PTC Fuses, NTC & PTC thermistors, thermostats, thermal cut-outs,
thermal fuses and other circuit protection devices are all
available from the UK's market leaders.
ATC Semitec Products
Semifuse PTCs are resettable current fuses based on conductive polymer PTC technology. The PTC fuse will happily carry its rated "hold" current value until it is exceeded. If over-current occurs, the PTC resistance increases dramatically to limit 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 Semifuse PTC then "resets" to its pre-fault level ready to protect again.
Semifuse PTC fuses are available in a wide range of current values, voltages and formats. So whether you need a low-profile "strap", through-hole p.c.b. or SMD design, Semifuse is all you need.
Our SFSR (was SFP) strap series offers continuous protection from 1.2A to 4.2A with voltages up to 24V. For higher current values our SFLR series can be used upto 7.3A/20V and also benefits from lower cold resistance values. For a more compact protector, our SFVT series offer higher current values (1.7A-2.4A) in a slimmer design. These are suitable for Li-Ion batteries and other space-critical applications.
SFSR PTC fuses provide reliable, non-cycling protection for rechargeable batteries.
They have nickel straps that are ideal for direct installation onto battery cells.
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SFLR PTCs have a lower resistance. The smaller mass gives faster trip times and improved battery protection. SFLRs are ideally for high-power battery applications.
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SFVT PTCs are ultra-slim and have a lower trip temperature. Ideal for Li-ion battery protection, they offer protection against overcurrent and overtemperature conditions.
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The Semifuse SFR radial resettable PTCs offer an extensive range of current values from 0.05A to 15A with voltage ratings from 16V right up to 240VAC. This is the widest range of radial PTC fuses available;
These 16V rated radial PTC fuses offer current ratings from 2.5A to 14A for automotive and other low voltage DC designs. Ideal for replacing conventional one-shot current fuses.
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30V PTC resettable fuses offer hold currents from 0.9A to 9A. They are used to protect battery chargers, computer peripherals, rechargeable batteries, etc.
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These 60V polymer PTCs support through currents from 0.05A to 3.75A. Ideal for protecting power supplies, speakers, security and alarm systems, electric motors, etc.
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240V mains rated PTC fuses from 0.05A to 2A. Suitable for transformer, electric motor and other electrical circuits, offering superior performance to conventional current fuses.
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Semifuse's SMD PTC range is one of the most comprehensive available. With footprints as small as 0805 up to the largest 2920, Semifuse SMD PTCs can offer compact circuit protection for currents from 0.1A to 3A with voltages upto 60V.
SFS0805F - 0805 Size package
SFS1206F - 1206 Size package
SFS1210F - 1210 Size package
SFS1812F - 1812 Size package
SFS2920F - 2920 Size package