Fuse Characteristics: CLASS_RK5
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_RK5 | rk5_250v | 600 | 0.1 | Class RK5 250VAC; current-limiting but higher I2t threshold than RK1; lower peak let-through than Class H/K; common in existing industrial installations; 200kA interrupting | 1.1 | 0.9 | current_limiting | class_R_ferrule_or_blade | RK5 | 200 | 20 | Class RK5 I2t and peak let-through current limits approximately 2-5x Class RK1 for same rating; still provides significant current limitation; dimensionally identical to RK1; fits Class R fuseholder | rejection_notch_class_R_blade | fast_acting | UL_248-12 | 250 |
| CLASS_RK5 | rk5_600v | 600 | 0.1 | Class RK5 600VAC; one-time or renewable design; provides current limitation and rejection feature; lower peak arc-flash energy than H or K fuses; common upgrade from Class H installations | 1.1 | 0.9 | current_limiting | class_R_ferrule_or_blade | RK5 | 200 | 20 | RK5 peak let-through current at 100kA available fault (approx): 30A~10kA; 100A~18kA; 400A~35kA; 600A~45kA from Eaton current-limitation curves | rejection_notch_class_R_blade | fast_acting | UL_248-12 | 600 |
| CLASS_RK5 | rk5_600v_td | 600 | 0.1 | Time-delay Class RK5; dual element; 10s at 500%; very common for motor protection; NEC 430.52 allows 175% max for TD fuses; lower cost vs RK1 acceptable in many applications | 1.35 | 1.1 | current_limiting | class_R_ferrule_or_blade | RK5_time_delay | 200 | 20 | Most common upgrade from non-rejection Class H/K; lower arc flash energy vs Class H; accepts overloads for motor starting without nuisance tripping | rejection_notch_class_R_blade | time_delay | UL_248-12 | 600 |
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