Fuse Characteristics: CLASS T
t300 lt 0175A to t300 lt 0600A
Fuse time-current characteristics, voltage ratings, interrupting capacity, and current-limiting classification by fuse class (UL 248 and IEC 60269). Also includes per-rating let-through current (peak A) and I²t (A²s) data from IEEE Std 3004.3-2020 for arc-flash and short-circuit coordination studies, covering Classes RK1, RK5, J, T (300V/600V), L, CC, G, CF, CD, C, CA, CB, mine-duty, and semiconductor fuse voltage derating.
| fuse class | record id | amp rating label | amp rating max (A) | amp rating min (A) | i2t 100kA A2s (A2s) | i2t 200kA A2s (A2s) | i2t 50kA A2s (A2s) | peak lt 100kA A (A) | peak lt 200kA A (A) | peak lt 50kA A (A) | standard | voltage rating V (V) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CLASS T | t300 lt 0175A | 175A | 175 | 175 | 115,000 | — | — | 15,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0200A | 200A | 200 | 200 | 150,000 | 150,000 | 150,000 | 16,000 | 20,000 | 13,000 | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0225A | 225A | 225 | 225 | 175,000 | — | — | 21,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0250A | 250A | 250 | 250 | 225,000 | — | — | 22,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0300A | 300A | 300 | 300 | 300,000 | — | — | 24,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0350A | 350A | 350 | 350 | 400,000 | — | — | 27,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0400A | 400A | 400 | 400 | 550,000 | 550,000 | 550,000 | 28,000 | 35,000 | 22,000 | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0450A | 450A | 450 | 450 | 600,000 | — | — | 32,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0500A | 500A | 500 | 500 | 800,000 | — | — | 37,000 | — | — | IEEE Std 3004.3-2020 | 300 |
| CLASS T | t300 lt 0600A | 600A | 600 | 600 | 1,000,000 | 1,000,000 | 1,000,000 | 37,000 | 46,000 | 29,000 | IEEE Std 3004.3-2020 | 300 |
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