I think the fuse is non reset-able and able to withstand till 300v. here the model i find
Littelfuse 36911000000 369 T1A 300V Fuse micro fuse Time-Lag Radial Lead Square Fuse.
Thanks for the info, in that case, the fuse will blow if exceed its power rating. However, IMO, 1A fuse is too high and unable to protect this transformer.
The funny part is i was not able to measure any resistance after the fuse, meaning the 2 legs of the transformer, i suppose it have few milli ohms.
That’s weird! unless the primary winding is shorted (due to over voltage?), it should has more than 10 of ohms resistance for such a small transformer. I got reading of 24ohms on primary winding of a 24VA transformer and 36ohms on a 12VA transformer. You should measure it with the blue and brown cable disconnected to get accurate reading.