SM & SML Power Fuses for Underground Distribution, Indoor

Available from S&C Electric Company

SM and SML Power Fuses are especially suited for protecting cables and medium-to-large power transformers on utility, as well as industrial, commercial, and institutional power systems through 34.5 kV. They incorporate precision-engineered nondamageable silver or nickel-chrome fusible elements with time-current characteristics that are precise and permanently accurate — assuring not only dependable performance, but also continued reliability of system coordination plans.

With SM and SML 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 and SML Power Fuses are offered with maximum continuous current ratings of 200, 300, 400, and 720 amperes, in a variety of fault-interrupting ratings. They’re available in a wide variety of ampere ratings, in five different speeds: S&C “K”, Standard, Slow, Very Slow, and Coordinating. This broad selection of ampere ratings and speeds permits close fusing to achieve maximum protection and optimum coordination.

SML Power Fuses, further, include Uni-Rupter™, which provides 200-ampere single-pole live switching of single-phase and three-phase circuits on distribution systems through 25 kV. Uni-Rupter offers the ultimate in live-switching simplicity: a firm, steady opening pull on the fuse with a hookstick is all that is required for circuit interruption.

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