Selection of the fuse

   In order to facilitate the users needed protection against the elements, circuit or device of choice of a suitable fuse, a special version of the Guide.
Selection of the fuse follow the following process:
Factors to be considered
According to  zhenji required safety certification decision fuse of the security authentication, in which, initially set optional UL IEC specifications or specifications of the fuse.
1, when the circuit design of space constraints.
2, installation methods.

Rated voltage should be more than equal to the effective circuit voltage.

Breaking capacity should be larger than the current circuit in the biggest fault current.

zhenji circuit in the switch when the existence of starting current, starting current in some circuits it is normal for such occasions should be used slowly broken-or medium-slow off the fuse.
Must cut off the fuse of the current and duration (the conditions by circuit designers in accordance with the specific protection needs may be). The corresponding reference models of IT curve, meet the admission requirements of the maximum

current limit on the A1.
1, through the fuse of the steady-state current (depending on the circuit may be).
2, IEC specifications and UL specifications fuse of the difference between the current ratings, see "steady-state current."
3, the ambient temperature of the fuse of the carrying capacity of the impact, see "the ambient temperature."
4, pulse (impact of current, inrush current, starting current and transient current value) on the life of fuse, see "Pulse."
5, starting current and duration of the corresponding models of I-T curve comparison.
Comprehensive consider the above five factors, selected to meet the minimum requirements of the current rating as the lower

limit of A2.
Comprehensive consider the above factors, the most appropriate models and rated current. When the A1 ≥ A2, A1 to A2 may be selected within the range of any of the specifications of the fuse. When the A1 <A2, the proposed selection of other types of fuses.
Samples should be in the actual circuit in the test run.

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