Curvas de fusibles
1000 900 800 700 600 500 400 5 6 7 8 9 10 20 30 40 50 60 70 80 90 80000 90000 100000 1000 900 800 700 600 500 400 300 200 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 8000 9000 1000020000 30000 40000 50000 60000 70000 800 900 1000 2000 3000 4000 5000 6000 7000 100 200 300 400 500 600 700
125E
150E
175E 200E
250E
300E
400E 2-250E 2-300E
100E
300
200100 90 80 70 60 50 40
30
20
10 9 8 7 6 5
TIME IN SECONDS
2-400E
10E
13E 15E
20E
25E
30E
40E
50E
65E
80E
3E
5E
7E
TIME IN SECONDS
4
4
33
2
2
1 .9 .8 .7 .6 .5 .4
1 .9 .8 .7 .6 .5 .4
.3
.3
.2
.2
.1 .09 .08 .07 .06 .05 .04
.1 .09 .08 .07 .06 .05 .04
.03
.03
.02
.02
.01 100 200 300 400 500 600700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 5 6 7 8 9 10 20 30 40 50 60 70 80 90
.01
CURRENT IN AMPERES
MINIMUMMELTING TIME-CURRENT CHARACTERISTIC CURVES
SMU FUSE UNITS—S&C STANDARD SPEED
BASIS—These fuse units are tested in accordance with the procedures described in ANSI Standard C37.41-1981, and they arerated to comply with ANSI Standard C37.46-1981. As required by these standards, the minimum melting current is not less than 200% of fuse-unit ampere rating, and the minimum melting curves are based ontests starting with the fuse unit at an ambient temperature of 25°C and no initial load. CONSTRUCTION—Fusible elements for fuse units rated 3E through 7E amperes are nickel-chrome, under controlledtension; fusible elements for fuse units rated 10E through 400E amperes are silver, helically coiled. All are of solderless construction. TOLERANCES—Curves are plotted to minimum test points. Maximumvariations expressed in current values are: Plus 10% for 10E through 400E ampere ratings. Plus 15% for 5E through 7E ampere ratings. Plus 20% for 3E ampere rating. APPLICATION—Like all high-voltage...
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