SMD® Power Fuses
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.
With SMD 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
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.
Ratings
| Fuse Type | kV | Amperes, RMS, Symmetrical | ||||
|---|---|---|---|---|---|---|
| Nominal | Maximum | BIL | Maximum | Interrupting | ||
| 60 Hz | 50 Hz | |||||
| SMD-20 | 14.4 14.4 14.4 25 34.5 |
17.0 17.0 17.0 27 38 |
110 125 150 150 200 |
200E or 200K 200E or 200K 200E or 200K 200E or 200K 200E or 200K |
14 000 14 000 14 000 12 500 10 000 |
11 200 11 200 11 200 10 000 8 000 |
| SMD-40 | 4.8 14.4 25 |
5.5 17.0 29 |
95 110 150 |
400E 400E 400E |
25 000 25 000 20 000 |
20 000 20 000 16 000 |
Style
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