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Question About Fuse Markings

On my British-made power amp, the markings for each of the PSU fuses are "T25A H @ 100-120v," and for the control fuse it's "T1.25A H @100-120v." Are these slow blow or fast blow fuses, and what does the "H" stand for? Thanks for the help.
rlb61
noromance's avatar
noromance
9,830 posts
 
High breaking capacity. Are they ceramic? The T means time delay i.e. slow blow.
imhififan's avatar
imhififan
2,205 posts
 
https://www.swe-check.com.au/pages/learn_fuse_markings.php
H stand for high-breaking capacity.
 https://www.greenmailinternetmarketing.com/public_message_view.jsp?c=00005820&i=43

  • Low-Breaking Capacity—A minimal ability of the fuse to remain physically intact when overloaded. A low-breaking capacity fuse is readily subject to being physically destroyed if the current surge is great enough.
  • High-Breaking Capacity—A high level ability of the fuse to remain physically intact even when the overload is great. The fuse is usually constructed with a ceramic body, rather than glass, and filled with silica sand to absorb a large overload and protect the fuse itself.

rlb61 OP
789 posts
 

Thanks. Any idea what the fuse voltage would be and where I can purchase them in the USA?

noromance's avatar
noromance
9,830 posts
 
https://www.amazon.com/Qty-5x20mm-Slow-Blow-Ceramic-T2-5a/dp/B004GF7W4W

https://www.amazon.com/5x20mm-1-25A-Ceramic-Fuses-T1-25a/dp/B009N8IQWY/ref=sr_1_3?s=hi&ie=UTF8&qid=1517790691&sr=1-3&keywords=1.25A+Slow-Blow+Ceramic+Fuse+T
imhififan's avatar
imhififan
2,205 posts
 
Any idea what the fuse voltage would be and where I can purchase them in the USA?
You can use higher than 125V, not lower.
Size is important, 5X20mm or 6X32mm?
https://www.mouser.com/Circuit-Protection/Fuses/Cartridge-Fuses/_/N-ba8h0Z1yzvvqx?P=1ytpy00Z1z0z7p2Z...
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