FUZETEC self-healing fuses are widely and deeply used in the field of consumer electronics, mainly providing overcurrent and overheat protection for various devices through its PPTC (Polymer Positive Temperature Coefficient) technology, while balancing space efficiency and reliability. The following is an analysis of its specific application scenarios and technical characteristics:
1、 Mobile device protection (phone/tablet)
Lithium battery charging and discharging protection
Application location: Connected in series between the lithium battery output terminal and the main control circuit.
Function: To prevent thermal runaway caused by incorrect connection of high voltage to the charging interface (such as connecting a 12V fast charging head to a 5V device), battery short circuit, or over discharge. For example, the Fuzhi FSMD series (such as FSMD200-1206-R) patch fuses can respond to overcurrent in milliseconds, cutting off the circuit to avoid burning out the controller IC or MOS transistor.
Advantages: Low resistance (such as 0.06 Ω) reduces energy consumption, and 1206 package (1.6 × 3.2mm) saves PCB space.
USB interface protection
Application location: 5V line for USB data cable or power input terminal.
Function: To prevent external device short circuits (such as USB flash drive failures) or hot swappable surge currents from damaging the motherboard. The Fuzhi FUSB series (working current 0.75A – 2.50A) is designed specifically for low-voltage USB, supporting 16V/30V rated voltage and compatible with Type-C fast charging environments.
2、 Portable electronic device applications (power banks/handheld fans, etc.)
Power bank circuit protection
Application location: Input/output terminals and battery management unit (BMS).
Function: To prevent the risk of fire caused by short circuit or overload of the output port. Fuzhi patch fuses (such as 0603 package) can withstand a rated current of up to 40A and automatically reset after troubleshooting.
Handheld small fan motor protection
Application location: Motor drive circuit in series.
Function: To deal with instantaneous high currents caused by motor stalling or coil short circuits. For example, selecting a 6V voltage resistant model (such as the FRT series) can trigger high resistance state current limiting during locked rotor to avoid motor burnout and damage to the lithium battery.
3、 Computer and peripheral protection
Laptop power adapter
Application location: Output end of AC-DC conversion module.
Function: Suppress surge current and prevent load short circuit. The Fuzhi FRHV series (withstand voltage 60V-250VDC) is suitable for high voltage direct current environments, ensuring safe shutdown of the adapter under abnormal currents.
Peripheral interface protection (USB Hub/docking station)
Application location: Power supply lines for each port of USB hub.
Function: Isolate single port faults to avoid chain damage. The low operating current of Fuzhi fuse (such as 0.08A-0.40A) accurately matches the requirements of external devices.
4、 Smart home device protection
Smart speaker/router
Application location: Power management module and communication interface.
Function: Defend against lightning induced overcurrent or power fluctuations. The Fuzhi FRVL series (120VAC/DC withstand voltage) is suitable for AC power supply scenarios, ensuring stable operation of equipment under grid fluctuations.
LED lighting driver circuit
Application location: Front end of LED driver IC.
Function: To prevent the driver chip from overheating and becoming ineffective. The temperature sensitive characteristics of PPTC can simultaneously achieve dual protection against overcurrent and overheating, extending the lifespan of the lighting fixtures.
5、 Summary of Core Advantages
Application requirements: FUZETEC solution technology benefits
Space limited micro patch packaging (0603/0805/1206, etc.) saves 70% PCB area and supports high-density integration
Quickly respond to millisecond level actions (such as triggering within 1ms under 6A current) to prevent instant burning of precision ICs
Automatically maintain over 8000 cycles to protect zero replacement costs and enhance product durability
Wide voltage compatible with 6V-600V full range coverage (FRT/FUSB/FRHV, etc.), suitable for diverse consumer electronics scenarios
FUZETEC self recovery fuses have become an ideal choice for consumer electronics overcurrent protection through their miniaturized design, automatic recovery mechanism, and wide voltage adaptability. Its product line covers the full range of needs from fast charging for mobile phones to smart homes, significantly reducing device failure rates and maintenance costs. When designing and selecting, special attention should be paid to working voltage, holding current, and packaging matching (such as FSMD series for mobile devices and FRHV series for high-voltage power supplies) to achieve optimal protection efficiency.