Apparently, the preferred rating would be from a third category called “time-delay”, which I haven’t seen an equivalent of in the German literature.
Got the following information from Martin Reynolds:
- Quick-blow – blows almost immediately the rated current is exceeded.
- Slow-blow – can cope with a substantial surge current, eventually blows if the rated current is exceeded for more than a few seconds.
- Time-delay – copes with a brief switch-on surge (0.3 seconds?) but then blows if the rated current is exceeded for longer. Better protection than slow-blow.
Greetings from Switzerland, David.