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What Is A Fuse?
Fuses are also known as current fuses, and the IEC127 standard defines it as a "fuse body." It is primarily a function of current overload protection. When the circuit fails or abnormal, accompanied by rising current, and the rising current may damage some important devices in the circuit, it is possible to burn the circuit or even cause a fire.
If the circuit correctly install the fuse, then the fuse will rise in the current to a certain height and heat, when the fuse itself cut off the current, so as to protect the safe operation of the circuit.
Fuse Characteristics
• Resistivity is large; low melting point.
• Small size, easy to install
• Disjunction capability precision, reliability
• Different structural features, installation in various forms
• Under normal conditions, the fuse has a long shelf life
• Recoverable fuse, reset can be repeated use
• Long life of the fuse, in case of fault-free circuit, synchronized with the life of the equipment
Working Principle
Current fuse is a hot fusing working principle, when the current flows through the conductor, because fusing wire conductor there is a certain resistance, so the conductor will heat up. When the circuit current is not normal rise,fusing wire will heat fusing, cut off the circuit current.
Resettable fuse is a current anomaly, the resistance becomes larger working principle, when the current through the polymer polymer is not normal rise, the fuse resistance will become larger, through the fuse current will be reduced to ensure the normal work of the circuit.
Fuse Classification
Scope of use: power fuses, machine fuses, electronic fuses, car fuses.
Volume classification: large, medium, small and micro (SMD type).
Rated voltage classification: high voltage fuses, low voltage fuses and safety voltage fuses.
Breaking capacity classification: high and low breaking capacity fuse.
Shape classification:
Flat head tube fuse (can be divided into internal welding fuse and external welding fuse), Online fuses (Single hat online and double hat online, live), Punched Fuse, Guillotine Fuse, Screw Fuse, Insert Fuse, Flat Fuse, Wrap Fuse, SMD Fuse, Resistive Fuse.
Fusing speed (symbol) Category:
(Usually with the TT said), Slow fuse (generally used T), medium-speed fuse (generally used M), fast break fuse (generally used F said), special fast fuse (usually with FF) The
According to the current classification: 32ma, 63ma, 100mA, 150mA, 200mA, 250mA, 300mA, 400mA, 500mA, 600mA, 800mA, 1A, 1.25A,1.6A, 2A, 2.5A, 3A, 3.5A, 4A, 5A, 6A, 7A, 8A, 9A, 10A, 12A, 15A, 20A, 25A, 30A
Material points can be divided into: lead antimony alloy wire, lead-tin synthetic wire, silver-copper alloy wire, polymer PTC