LOGO

Fuse (fuse) is also known as a current fuse, IEC127 standard defines it as a fuse (fuse-link). It mainly plays an overload protection role. When the fuse is correctly placed
in the circuit, the fuse will fuse itself to cut off the current when the current rises abnormally to a certain height and heat, protecting the safe operation of the circuit.

constitute

Basic composition

General fuse is composed of three parts: one is the melt part, it is the core of the fuse, fuse when the role of cutting the current, the same type, the same specification of
fuse melt, the material should be the same, the geometric size should be the same, the resistance value as small as possible and consistent, the most important thing
is that the fuse characteristics should be consistent, household fuse commonly used lead antimony alloy made of; The second is the electrode part, usually there are two,
it is an important part of the melt and the circuit connection, it must have good conductivity, should not produce obvious installation contact resistance; The third is the
support part, the fuse melt is generally thin and soft, the role of the support is to fix the melt and make the three parts a rigid whole easy to install and use, it must have
good mechanical strength, insulation, heat resistance and flame retardant, in use should not produce fracture, deformation, combustion and short circuit and other phenomena.

Arc extinguishing device

The fuses used by power circuits and high-power equipment not only have three parts of the general fuse, but also have arc extinguishing devices, because the circuit
protected by such fuses not only has a large working current, but also the voltage at both ends is high when the melt is fused, and often the melt has melted (fused)
or even vaporized, but the current is not cut off. The reason is that at the moment of fusing under the action of voltage and current, the arc phenomenon occurs between
the two electrodes of the fuse. The arc extinguishing device must have strong insulation and good thermal conductivity, and be electronegative. Quartz sand is the
commonly used arc extinguishing material.

Fuse breaker

In addition, there are some fuses with a fuse indication device, its role is when the fuse action (fuse) after its own appearance changes, easy to be found by
maintenance personnel, such as: light, color change, pop-up solid indicator, etc.

sort

According to the protection form, it can be divided into: overcurrent protection and overheat protection. The fuse used for overcurrent protection is commonly referred to
as a fuse (also called a current-limiting fuse). Fuses used for overheat protection are generally referred to as "temperature fuses". Temperature fuse is divided into low
melting point alloy shape and temperature trigger shape and memory alloy shape and so on (temperature fuse is to prevent heating appliances or easy heating
appliances temperature is too high and to protect, such as: hair dryer, iron, rice cooker, electric stove, transformer, motor and so on; It responds to the increase in
temperature of electrical appliances and does not care about the working current of the circuit. It works differently from the "current limiting fuse").

According to the scope of use, it can be divided into: power fuse, machine tool fuse, electrical instrument fuse (electronic fuse), car fuse.

According to the volume, it can be divided into: large, medium, small and micro. According to the rated voltage, it can be divided into: high voltage fuse,
low voltage fuse and safety voltage fuse.

According to the breaking capacity, it can be divided into: high and low breaking capacity fuses.

According to the shape, it can be divided into: flat tubular fuse (which can be divided into internal welding fuse and external welding fuse), pointed tubular fuse,
guillotine fuse, spiral fuse, chip fuse, plate fuse, wrap fuse, patch fuse.

According to the fusing speed, it can be divided into: ultra-slow fuse (generally represented by TT), slow fuse (generally represented by T), medium speed fuse
(generally represented by M), fast fuse (generally represented by F), ultra-fast fuse (generally represented by FF).

According to the standard points, it can be divided into: European fuses, American fuses, Japanese fuses.

According to the type, it can be divided into: current fuse (patch fuse, micro fuse, insert fuse, tubular fuse), temperature fuse (RH[block type], RP[resistance type],
RY[metal shell]), self-recovery fuse (plug-in, laminated, patch).

According to the size can be divided into: patch type 0603,0805,1206,1210,1812,2016,2920; 2.4 x 7, non patch Φ Φ 3 x 7, 3.6 x 10 Φ, Φ 4.5 x 15, Φ 5.0 x 20,
5.16 x 20 Φ, Φ 6 x 25, Φ 6 x 30, Φ 6 x 32, Φ 8.5 x 8, Φ 8.5 x 8 x 4, Φ 10 x 38, Φ 14 x 51.

Self-resetting fuse

Low zero power resistance: the self-resetting fuse self-impedance is low, the power loss is small during normal operation, and the surface temperature is low.

Fast overcurrent protection: Due to its own material characteristics, the overcurrent state response speed is much faster than other overcurrent protection devices.

Self-locking operation: the self-resetting fuse is locked in the high resistance state with a very small current in the overcurrent protection state, and the
low resistance state will be restored only after the power is cut off or the overcurrent disappears.

Automatic reset: The self-resetting fuse resets itself after overcurrent protection (troubleshooting), without disassembling.

High current resistance: the self-resetting fuse has excellent high current resistance, and some specifications can withstand 100A current impact.

Application: PPTC has a wide range of applications and can be used in various electronic products, communication products, power supplies, etc.