Fuse Characteristics: CLASS_L
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) | notes | rejection feature | time delay | ul standard | voltage rating V (V) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CLASS_L | l_600v_1201 | 6,000 | 1,201 | Class L 600VAC 1201-6000A; largest UL branch-circuit fuse class; service entrance distribution switchboard; dimensional lengths increase with rating to prevent interchangeability | 1.35 | 0.9 | current_limiting | knife_blade_large | L | 200 | Class L upper limit 6000A; common sizes 1201/1350/1600/2000/2500/3000/4000/5000/6000A; bolt-in blade connector; peak let-through at 100kA fault (approx): 1200A~70kA; 2000A~90kA; 4000A~120kA | none_large_blade_size | fast_acting | UL_248-10 | 600 |
| CLASS_L | l_600v_601 | 1,200 | 601 | Class L 600VAC 601-1200A; all current-limiting; used for service entrance feeder large transformer primary; bolt-in blade design physically incompatible with lower-current classes; 200kA interrupting | 1.35 | 0.9 | current_limiting | knife_blade_large | L | 200 | Class L covers 601-6000A range; physically much larger than Class J; no ferrule — knife blade only; no rejection feature needed due to unique large physical size; effective current limitation at high currents | none_large_blade_size | fast_acting | UL_248-10 | 600 |
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