Fuse Characteristics: CLASS_K
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_K | k1_600v | 600 | 0.1 | Class K1 600VAC; current-limiting but NO rejection feature; 200kA interrupting; physically identical to Class H/K5 — interchangeable; K1 provides tighter current limitation than K5; replaced by RK1 in new designs | 1.1 | 0.9 | current_limiting | ferrule_or_knife_blade_class_K | K1 | 200 | Class K (K1/K5) predated Class R rejection feature; physically fit any Class H holder creating potential for incorrect replacement; Class K1 same performance as RK1 but without rejection; use RK in new designs | none | optional | UL_248-9 | 600 |
| CLASS_K | k5_600v | 600 | 0.1 | Class K5 600VAC; current-limiting without rejection feature; same I2t limiting as RK5 but fits Class H holders; lower current limitation than K1; largely replaced by Class RK5 in new designs | 1.1 | 0.9 | current_limiting | ferrule_or_knife_blade_class_K | K5 | 200 | K5 peak let-through similar to RK5; no rejection feature means any lower-rated fuse can be substituted; not recommended for new designs; Class K fuses still encountered in older industrial installations | none | optional | UL_248-9 | 600 |
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