A Fuse is an overcurrent protection device. When the current in a circuit exceeds its rated value or a short circuit occurs, the fuse will melt itself to cut off the circuit, thereby protecting electronic devices, lines and components from damage. The core feature of a fuse is that it is disposable (and needs to be replaced after it melts), and it works based on the thermal effect of current .
Fuses can be classified in many ways. Here are some common classification criteria in electronic materials:
l Tube fuses:
¢ Glass tube fuse: Transparent to observe the fuse state, commonly used in small current circuits (such as household appliances, consumer electronics).
¢ Ceramic tube fuse: Heat-resistant, impact-resistant, suitable for industrial equipment.
l Surface mount fuse (SMD) : Miniaturized for PCB boards such as mobile phones and laptops.
l Chip fuses: commonly used in automotive circuits (such as the Blade type).
l Bolt-mounted fuses: High current scenarios (such as industrial power supplies).
l Fast Acting: Quick response for sensitive devices (such as ics, leds).
l Slow-Blow/Time-Delay: Withstands short-term inrush currents and is suitable for motors and power circuits.
l Low-voltage fuses: such as DC circuits (12V/24V), electronic devices (5V/3.3V).
l High fuses: such as AC grid (250V/600V).
l Self-resetting fuse (PPTC) : Resistance surges when overcurrent occurs, automatically resets after power failure, for USB ports, etc.
l Temperature fuse: Responds to overheating (such as in electric heating appliances).
l High voltage fuse: such as photovoltaic systems, electric vehicles.
Fuses are widely used in situations where overcurrent protection is needed. Typical areas include:
1. Consumer electronics
¢ Mobile/tablet: Surface mount fuses protect charging circuits.
¢ Home appliances: AC fuses prevent short circuits in the power supply.
2. Automotive electronics
¢ Plug-in fuses protect headlights, ECUS, audio systems, etc.
3. Industrial equipment
¢ Slow-break fuses are used in motors and frequency converters to withstand starting current.
4. Power system
¢ High-voltage fuses are used in transformers and distribution cabinets.
5. New energy
¢ High-reliability fuses are required for photovoltaic inverters and battery management systems (BMS).
l Rated current (e.g. 1A, 10A)
l Rated voltage (e.g. 32V, 250V)
l Fuse characteristics (fast break/slow break)
l Breaking capacity (the maximum current that can be safely cut off during a short circuit)
l Size/Package (e.g. 1206 patch, 5×20mm glass tube)
l Do not replace the fuse with a wire as it may cause a fire.
l Self-resetting fuses are not suitable for high-precision protection scenarios (such as precision instruments).
l For high temperatures, choose heat-resistant materials such as ceramics.
Fuses, though small, are the "gatekeepers" of circuit safety, and proper selection can significantly improve system reliability.
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