Fuse Characteristics: CLASS_RK1
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_RK1 | rk1_250v | 600 | 0.1 | Class RK1 250VAC; most current-limiting class; motor branch; 0.1-600A; tighter I2t limits than RK5; dimensionally same as Class H/K but with rejection feature; preferred when maximum current limitation required | 1.1 | 0.9 | current_limiting | class_R_ferrule_or_blade | RK1 | 200 | 20 | Class RK1 provides highest degree of current limitation among branch circuit fuses; I2t and Ip values approximately 50-70% lower than RK5 for same rating; fits Class R rejection fuseholder only | rejection_notch_class_R_blade | fast_acting | UL_248-12 | 250 |
| CLASS_RK1 | rk1_600v | 600 | 0.1 | Class RK1 600VAC; highest level of current limitation among branch-circuit fuses; ferrule type up to 60A knife-blade type 61-600A | 1.1 | 0.9 | current_limiting | class_R_ferrule_or_blade | RK1 | 200 | 20 | Class R rejection slot prevents Class H non-current-limiting fuses from being installed in Class RK fuseholder; 200kA interrupting per UL 248-12 | rejection_notch_class_R_blade | fast_acting | UL_248-12 | 600 |
| CLASS_RK1 | rk1_600v_td | 600 | 0.1 | Time-delay Class RK1; dual element; 10s at 500%; used for motor branch circuit protection; NEC 430.52 allows 175% max for TD fuses; maximum current limitation with overload tolerance | 1.35 | 1.1 | current_limiting | class_R_ferrule_or_blade | RK1_time_delay | 200 | 20 | Bussmann LPN-RK/LPS-RK Low-Peak; Littelfuse LLNRK/LLSRK; 500% carry for 10s minimum; most restrictive current limitation available for motor branch circuits | rejection_notch_class_R_blade | time_delay | UL_248-12 | 600 |
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