S&C - Model SMD - Power Fuses - Outdoor Distribution Transformer
SMD Power Fuses are especially suited for protecting transformers, capacitor banks, and cables in outdoor distribution substations 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.
For use at 14.4 kV through 34.5 kV
Offering full-fault-spectrum protection, SMD Power Fuses detect and interrupt all faults—large, medium, and small—even down to minimum melting current
SMD-20 Power Fuses, rated 200 amperes continuous, utilize SMU-20 Fuse Units. These fuse units are offered in a variety of ampere ratings, in five different speeds — S&C “K,” Standard, Slow, Very Slow, and “DR.” They provide interrupting ratings of up to 14,000 amperes symmetrical at 60 Hz.
SMD-40 Power Fuses, rated 400 amperes continuous, utilize SMU-40 Fuse Units. These fuse units are similarly offered in a variety of ampere ratings, in four different speeds — S&C “K”, Standard, Slow, and Very Slow. They provide interrupting ratings of up to 25,000 amperes symmetrical at 60 Hz.
This broad selection of ampere ratings and speeds permits close fusing to achieve maximum protection and optimum coordination. SMD-20 and SMD-40 Power Fuses are manufactured in accordance with a quality system certified to ISO9001:2000.