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S&C - Model SM -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.
For outdoor distribution, 4.16 kV through 34.5 kV
For use with SM Refill Units, S&C SM Power Fuses are especially suited for protecting transformers, capacitor banks, and cables in outdoor distribution substations
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.
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.