Fuse Characteristics: CLASS_T
Fuse time-current characteristics, voltage ratings, interrupting capacity, and current-limiting classification by fuse class. Covers UL 248 classes (J, RK1, RK5, CC, T, L, G, H, K) and IEC 60269 types (gG, gM, aR, aM). Includes melting and clearing I2t let-through energy ranges, peak let-through current, conventional fusing/non-fusing current factors, rejection feature type, and application guidance.
| fuse class | record id | amp rating max (A) | amp rating min (A) | application | conventional fusing current factor (dimensionless) | conventional nonfusing current factor (dimensionless) | current limiting | dimensions ferrule blade | fuse type | interrupting rating kA ac (kA) | interrupting rating kA dc (kA) | notes | rejection feature | time delay | ul standard | voltage rating V (V) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CLASS_T | t_300v | 1,200 | 0.1 | Class T 300VAC 0.1-1200A; very compact physical size vs Class J/L; dimensionally non-interchangeable; preferred for service entrance and large feeder protection where space is limited | 1.35 | 0.9 | current_limiting | very_compact_ferrule_or_blade | T | 200 | 100 | Class T physical dimensions much smaller than Class J for same ampere rating preventing inadvertent mixing; available in 300V and 600V versions; 200kA AC interrupting 100kA DC | none_physically_distinct | fast_acting | UL_248-15 | 300 |
| CLASS_T | t_600v | 1,200 | 0.1 | Class T 600VAC up to 1200A; bridges gap between Class J (max 600A) and Class L (from 601A); compact design; used in service entrance applications large motor feeders distribution panels | 1.35 | 0.9 | current_limiting | very_compact_ferrule_or_blade | T | 200 | 100 | Class T provides current limitation up to 1200A at 600VAC; peak let-through current competitive with Class J at same rating; available in both 300V and 600V physically distinct sizes | none_physically_distinct | fast_acting | UL_248-15 | 600 |
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