GSS
6 Characteristics The characteristic is an expression for the time-current performance of the fuse-links.
Short circuit protection for semiconductor components (diodes, thyristors, triacs, transistors, MCT, etc.) Full range protection of semiconductors and their supply lines For protection of photovoltaic systems Protection against high overload and short circuit currents, fuses are used in electrical circuit without inrush current pulse, or as mains fuses Used primarily at low operating voltages, if no high inrush currents have to be taken into account. For high inrush currents have slow decaying transients(e.g. transformers). For very high and long lasting inrush currents(e.g. motors)
FF gRL gPV F M T TT
Very quick acting Very quick acting
Quick acting Medium time lag Time lag Long time lag
7 Applications 7.1 Different definitions of the Rated Currents in the International Standards In principle, two different ratings of the continuous current must be taken into account, preventing direct conversion of
the fuse links according to IEC 60127 and UL 248-14.
a) Continuous current rating according to IEC 60127.
I n I b
b) Continuous current rating according to UL 248-14.
I n I b / 0.7
Figure 1 enables approximate conversion of rated current between UL and IEC standards
Figure 1
7.2 Operation at extra-Low-Voltage U b << U rat Fuse-links can operate without difficulty at voltages below their rated voltage. The voltage drop of the fuse-links (internal resistance) must be taken into consideration, particularly at very low rated currents.
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