SM_HeroShotSM Power Fuses

SM Power Fuses are especially suited for protecting transformers, capacitor banks, and cables in outdoor distribution substations through 34.5 kV. Their precision-engineered nondamageable silver or nickel-chrome fusible elements have time-current characteristics that are precise and permanently accurate — assuring not only dependable performance, but also continued reliability of system coordination plans.

With SM Power Fuses, source-side devices may be set for faster operation than practical with other power fuses or circuit breakers, thereby providing better system protection without compromising coordination.

Features

SM-4 Power Fuses, rated 200 amperes continuous, utilize SM-4® Refill Units. These refill units are offered in a variety of ampere ratings, in three different speeds — S&C Standard, Slow, and Coordinating. They provide interrupting ratings of up to 15,600 amperes symmetrical.

SM-5 Power Fuses, rated 300, 400, or 720 amperes continuous, utilize SM-5® Refill Units. These refill units are similarly offered in a variety of ampere ratings, in three different speeds — S&C Standard, Slow, and Coordinating. They provide interrupting ratings of up to 34,000 amperes symmetrical.

This broad selection of ampere ratings and speeds permits close fusing to achieve maximum protection and optimum coordination. SM-4 and SM-5 Power Fuses are manufactured in accordance with a quality system certified to ISO9001:2000.

Ratings

Fuse Type kV Amperes, RMS,
Symmetrical
Nominal Maximum BIL Maximum Interrupting
60 Hz 50 Hz
SM-4 7.2
14.4
25
34.5
8.3
17.0
27
38
95
110
150
150 & 200
200E
200E
200E
200E
15 600
12 500
9 400
6 250
15 600
12 500
9 400
6 250
SM-5 7.2
14.4
14.4
25
34.5
8.3
17.0
17.0
27
38
95
110
110
150
150 &200
400E & 720E
400E
720E
300E
300E
26 000
34 000♠
25 000
20 000
17 500
26 000
25 000
25 000
20 000
17 500

♠ 25 000 amperes for systems above 15.5 kV thru 17.0 kV.

 Style

sm-power-fuses-indoor

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