Common fuze types can be classified according to their fuze characteristics, packaging, voltage rating and application scenarios. Below is a detailed analysis and corresponding application scenario:
I. Classification by Fusing Characteristics
1.Fast-Blow Fuse
Characteristics: Reacts quickly to an overload current, usually melting rapidly at 1.5 to3 times the rated current (milliseconds).
Application Scenarios:
Electronic equipment protection: such as power adapters, chargers, LED lights, etc., require to quickly cut short-circuit circuit current to prevent components from burning out.
Precision circuit: such as computer motherboards, communication equipment, etc. to prevent overload current damage to sensitive chip.
Low starter current device: such as television set, monitor, etc., the current is stable after starter, no delay protection is required.
2. Time-Delay Fuse/Slow-Blow Fuse
Characteristics: Suitable for short-term overload (e.g. 3-5 times rated current) with a delay of seconds to minutes before melting.
Applicable Scenarios:
Electrical equipment: such as air conditioners, refrigerator, washing machines, its starting current is 3-7 times the normal working current, measures require to be taken to prevent accidental fuse blowout.
Transformer/Inductive loads: For example, fluorescent lamp ballast and power transformers, instantaneous surge currents needs to be suppressed.
Capacitor charging circuit: such as UPS uninterruptible power supplies, capacitor can be charged in a short period of time.
3. Thermal Fuse
Features: The fuse is activated according to temperature rather than current (e.g., rated temperatures 125°C, 142°C, etc.).
Applicable Scenarios:
Overheat protection: such as hair dryers, rice cookers, microwave ovens, etc., to prevent overheating due to poor heat dissipation or malfunction.
Battery pack protection: lithium battery packs, for example, prevent fires caused by uncontrolled battery heat.
ii. By Packaging Form
1. Blade Fuse/Cartridge Fuse
Common types: Mini, ATO, ATC, MAXI, etc. (different sizes).
Features: Standardized design, easy to replace, with a transparent window to observe fuse status. **Applicable Scenarios:**
1. **Automotive Circuits:** such as engine control, lighting and audio systems (generally ATO/ATC).
**Industrial equipment:** machine tools, automation equipment, etc., requiring rapid replacement of low-voltage circuits.
2. **Surface Mount Fuses (SMD Fuse)**
Common types: 0402, 0603, 1206 (size codes).
Features: Small size, suitable for automated mounting but lower rated current (usually ≤20A).
Applicable Scenarios:
Portable electronic devices such as cell phones, tablets, smartwatches, etc.
High-density circuit boards: such as servers and switches, save space and improve reliability.
3. **Glass Tube Fuses**
Features: Clear glass casing, direct observation of fuse status, low cost.
Applicable Scenarios:
Traditional household appliances: such as radios, old-fashioned televisions, fans, etc.
Laboratory equipment: If power supply test benches, rapid determination fuse failure is required.
4. Ceramic Tube Fuse
Features: High temperature resistance, high voltage resistance (600V and above), strong breaking ability.
Uses: Industrial power supplies: such as photovoltaic inverters, industrial inverter, etc..
High-voltage equipment: such as X-ray machine, medical equipment, power supplies, etc.
V. Pico Fuse/Micro Fuse
Features: Miniaturized design, rated current usually ≤15A.
Application: Consumer electronics: such as game consoles, digital cameras, etc.
Automotive electronics: such as car navigation system, dashboard, etc.
III. By Voltage Rating
1. Low Voltage Fuse (≤250V)
Uses: Household appliances such as electric kettle, electric heater (220V AC), etc.
Automotive circuit: 12V/24V DC systems.
2. High-voltage fuses ≥ 600 V
Applicable scenarios:
Industrial equipment: e.g. welder, arc furnaces (380V/660V AC).
New energy sources such as photovoltaic modules (1000V DC), wind power converters, etc.
IV. INTRODUCTION Special Application Scenarios Fuzes
1. Self-reset fuse (PPTC/Polyfuse)
Features: Resistance increases when overloaded, limiting current; automatic reset after fault resolution.
Applicable scenarios:
Pluggable devices: Avoid frequent fuse replacements, such as USB ports and headphone jacks.
Battery protection: such as power tool battery packs to prevent overcharging/overdischarge.
2. Installation of fusion resistor on the surface
Features: Combines a resistor and fuse functions; opens circuit before overload fuses.
Applicable scenarios:
Cost-sensitive circuits: reduce the count of components, such as small appliance control boards.
V. Core Selection Principles
Current Matching: Maximum continuous current × 1.25 for rated ≥ equipment (1.5 times fast blow fuze).
Voltage Compatibility: Fuse rated voltage ≥ Equipment operating voltage.
Environmental Adaptability: Derated operation is required in high-temperature environments (e.g., 20% reduction in rated current at 85°C).
Certification Requirements: Automotive industry requires AEC-Q200 certification, household appliances require IEC 60127 standard.
Example Scenarios
Car headlight short circuit: use an ATO 20A fast-blow fuse quickly cut the 12V DC circuit.
Air conditioning compressor starting: Slow blow fuse with a MAXI 30A slow-blow fuse 30A tolerates 5 times instantaneous current.
Photovoltaic module overvoltage: use 690V ceramic tube fuse to interrupt off 1000V DC fault current.
By choosing fuse types reasonably, the protection needs and costs of the equipment can be balanced and secondary failure caused by improper use of the fuse can be avoided.