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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
6 responses Add your response
noromance's avatar
noromance
9,833 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
9,833 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...
rlb61 OP
789 posts
 
5x20mm. Will use 250v. Thanks.
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