You must have a primary fuse at least at all times! Unless the transformer is shortcircuit proof like some small ones are. The picture below shows such a transformer, from german Hahn.
http://home5.swipnet.se/~w-50674/hifi_pics/hifi_100pr/qrv07r0_overview.jpg
http://home5.swipnet.se/~w-50674/hifi_pics/hifi_100pr/qrv07r0_overview.jpg
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