Hi Stephen,
The Zt Z S/30 was the standard mechanical fuse with a Krupp-Thiel clock mechanism. Max running time was 30secs
The Zt Z S/30.1 differed principally from the S/30 in external shape (being more rounded) and had a min. running time of 1 sec.
There was also a Zt Z S/30.2, which only had the min. running time, (i.e same external shape as the standard S/30)
Cheers
Drew
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