View Full Version : fuse rating, "e''
07-01-2007, 05:15 PM
hi, im gonna be hooking up some cathodes inside my car when the switch comes and i was looking around my closet and i found my fuses that i have. now, i know these things take barely anything so i was trying to find the smallest one. i have a 5amp, BUT what does an "E" mean on a fuse?if it matters it is a light purple fuse.
07-01-2007, 05:22 PM
Continuous current ratings of power fuses are expressed in "E" amperes.
The "E" rating means:
(1) that the fuse will carry its rated current continuously without exceeding NEMA specified temperature rise;
(2) that fuses with E ratings of 100 A or less will melt on a current of 200 to 240% of rated amps in 300 seconds and
(3) that fuses with E ratings greater than 100 A will melt in 600 seconds with a current of 220 to 264% of their ampere ratings.
from: Types of Power Fuses (http://polk-burnett.apogee.net/pd/dvmvy.asp)
PS: It must be an American thing.
It isn't in my "Applications of Electrical Construction" test book; using Canadian standards.
07-01-2007, 05:36 PM
so what does all that mean? and waht are they used for? i think ill just use a 5amp
07-01-2007, 06:27 PM
I vaguely remember this. Basically its just saying it can handle more than its rated to the extent that if it was something sensitive it could be damaged before the fuse pops. I wouldn't worry about it for you applications.
07-01-2007, 06:45 PM
um, so wats it rated to? haha....wats the point in having one
07-02-2007, 07:23 AM
It means you have "slow blow" fuses. They won't open the second they see over 5 amps of current. Instead you will need a sizable spike to make them open.
Don't think it's a good idea not to use fuses. If you get a short it can very easily set your car on fire.
07-02-2007, 07:58 AM
what i meant was whats the point to this E fuse. but now i get it thanks.
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