Fuses? How Do They Differ?
This is not necessarily C2-related but it does have automotive relevance. In looking through the Owner's Manual for my latest old Corvette I had a peek at the fuse and breaker data. To my eye they all look very much the same: glass and cylindrical. But the descriptions differ. Here are examples:
-headlamp circuit, circuit breaker (seems straight-forward) -backup lamps & turn signal, AGC fuse (20 amp) -heater-A/C, 3AG fuse (25 amp) -tail lamps, SFE fuse (20 amp) What is the difference between AGC, 3AG, and SFE? *Edit*-This pic shows the whole story. The year is 1974. http://img.photobucket.com/albums/v1...fy97/fuses.jpg |
Originally Posted by paul67
(Post 1565217352)
This is not necessarily C2-related but it does have automotive relevance. In looking through the Owner's Manual for my latest old Corvette I had a peek at the fuse and breaker data. To my eye they all look very much the same: glass and cylindrical. But the descriptions differ. Here are examples:
-headlamp circuit, circuit breaker (seems straight-forward) -backup lamps & turn signal, AGC fuse (20 amp) -heater-A/C, 3AG fuse (25 amp) -tail lamps, SFE fuse (20 amp) What is the difference between AGC, 3AG, and SFE? AGC vs 3AG, I couldn't say. Jim |
AGC glass fuses are all the same length (1-1/4"), regardless of rating, from 1 amp to 30 amps. SFE (Society of Fuse Engineers) glass fuses are the same diameter as AGC fuses (1/4"), but are six different lengths depending on their amp rating (from 5/8" long for 1-amp to 1-7/16" long for 30-amp). :thumbs:
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Society of Fuse Engineers? Who would of thunk? Bill.
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Thnks but why would an SFE 20-amp and an AGC 20-amp be included in the same fuse box?
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Brain spasm with my posting yesterday.:bs
The SFE fuse designation is NOT a slow acting fuse. I believe the original automotive designation for a slow acting fuse, as is needed for brake lights, was SAE. In any event slow acting fuses are available in the Bussman brand, the MDL series: http://host1.publiquik.com/bussmann_...?familyUid=695 Jim |
Don't stress over this, just use the correct amp rated fuse!
The "slo blow" refers to the time it takes to blow when the fuse is in a severe overload condition. |
Originally Posted by mikem350
(Post 1565240032)
Don't stress over this, just use the correct amp rated fuse!
The "slo blow" refers to the time it takes to blow when the fuse is in a severe overload condition. |
Originally Posted by paul67
(Post 1565226905)
Thnks but why would an SFE 20-amp and an AGC 20-amp be included in the same fuse box?
The 3AG fuse is "fast" acting. Typical times at percent of rated current are: 4 hours at 110%, 1 hour at 135%, 5 seconds at 200% - all at 32 volts. ACG fuses have about the same time@load ratings, but are rated at 110volts. Which is specified should depend on several factors: whether ambient temperature of the device will effect the current draw, start up draw interaction if multiple devices are on the same fuse, and of course the preference of the designer. :blueangel: |
Old thread yep! But this is good reading ... especially for someone like me who just went through the gamut with the fuse panel. :thumbs:
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