The fuse divides the work grade according to function

Work level

The fuse is classified according to its function. At this point, the first letter indicates the function level, while the second letter represents the protected object.

– letter 1

–a local scope protection (backup protection fuse)

-g full range protection (general purpose fuse)

– the second letter

–G cable and wire protection (general application)

–M switch protection.

– (protection of motor loop)

–R semiconductor protection (for rectifier protection)

-L cable and wire protection.

– (according to DIN VDE)

– the following work grades are included in our catalogue:
–gL (DIN VDE) /gG (IEC)

- full range of cable and wire protection.


- protection of local motor circuits.


- a partial range of semiconductor protection.


- full range of semiconductor protection.

- quick action

- full range of cable and wire protection.

- slow motion

- full range of cable and wire protection.


Breaking capacity

- fuse outstanding advantage is rated high breaking capacity, and covers an area of small volume, the basic requirement of relevant test data with the test circuit, such as voltage, power factor, breaking phase Angle and so on in the German standard (DIN VDE 0636) and the international standard (IEC 269) have detailed rules.

- in order to guarantee from minimum overload current to the short circuit current within the scope of rated breaking capacity, stable in quality of design and manufacture of fuse body must pay attention to many characteristics, such as in addition to the melt design, to melt the size, shape cutting graphics and its position in the fusion tube, compressive strength and temperature of the molten tube alternating strength and chemical purity of quartz sand, particle size and tap density is of great significance.
Current limiting

In addition to the stable rated breaking capacity, the current limiting effect of the fused body plays an important role in the economy of the power supply system. When the short circuit is broken by the fuse, the short circuit current is continuously flowing into the power grid before the circuit breaker is broken. The short-circuit current is limited only by the network impedance.

A series of electric arcs are produced by melting at the same time through the entire narrow neck of the melt, which has a strong limiting effect and ensures rapid separation.

Similarly, current limiting characteristics are largely determined by the quality of the manufacturing of the fuse. Siemens – fuse has extremely high current limiting characteristics.

The rapid establishment of arc and accurate quenching are the prerequisites to ensure the reliable breaking ability.
Fuse and cable.

– matching with wire protection.

– according to the regulation of DIN VDE 0100 part 430, in the case of overload, the matching of fuse and cable – and wire protection shall meet the following conditions:

– (1) IB is less than or equal to

– (2) I2 is less than or equal to 1.45 * IN (tripping rule)

–IB: the operating current of the loop.

-IN: the rated current of the protective device.

-iz: the allowable current-carrying capacity of a cable or conductor under specified working conditions.

–I2: the release current of the protective device under specified conditions (large test current)

Taking into account the split characteristics of possible protective devices (such as fuses), a multiple of 1.45 is internationally recognized for compromise between the use of conductors and the level of protection.

– the fuse of the manufacturing grade gL/gG produced by Siemens conforms to the provisions of DIN VDE 0636 supplementary standard, which can meet the requirements completely:

“According to the above DIN VDE 0636 supplementary standard, IN the special test conditions, I2 =1.45 * IN is divided IN the conventional test time” so that the direct matching can be achieved.
Rated power loss

The economy of the fuse depends largely on the rated power loss. The loss power should be as small as possible, and the inherent heat may be small. However, the physical relationship between rated breaking capacity and rated power must be noted when determining the inherent loss of the fuse. On the one hand, in pursuit of resistance value as small as possible, the more thick more advantage, melt the size of the design, on the other hand, in order to ensure high rated breaking capacity, melt and should be as thin as possible, it is advantageous to the arc extinguishing.

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Post time: Mar-18-2018
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