M.SCHNEIDER:  MINIATURE FUSE LINKS  - APPLICIATIONS

Miniature fuse links are used for the protection of electrical equipment and electonical circuits against damage or destruction caused by dangerous over currents and short circuits. 
Depending on the various applications fuse links for slow, medium slow, rapid or ultra rapid characteristics are used.

characteristic medium  (T - träge)
Application for extreme high and long lasting current surges.
for example: motor starts, add on connections of low resistors

characteristic medium slow - (MT - mittlelträge)
Application for regular current surges that subside fast
for example transformers, capacitors

characteristic rapid  (F - flink)

Application for low current surges and short circuit currents that shall be cut off  fast.

characteristic ultra rapid  (FF - superflink)
Application if extremly fast cut off is necessary, short circuit protection of semiconductor components
for example: thyristors, diodes, triacs