CURRENT IN AMPERES
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... [continua]

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