Fuse Characteristics: CLASS_H
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_H | h_250v | 600 | 0.1 | Class H 250VAC 0.1-600A; NON-current-limiting; 10kA interrupting only; renewable or one-time; lowest performance class; being phased out of modern designs; do not use where fault current exceeds 10kA | 1.35 | 0.9 | non_current_limiting | ferrule_or_knife_blade_class_H | H | 10 | Class H has no current-limitation requirement; minimum performance fuse; physically fits Class R fuseholders if rejection feature absent — safety hazard; one-time NEC compliant but not recommended | none | optional | UL_248-6 | 250 |
| CLASS_H | h_600v | 600 | 0.1 | Class H 600VAC; 10kA interrupting limit; must not be used where available fault current exceeds 10kA; cannot provide arc-flash reduction credit; replace with Class J or RK for modern arc-flash compliant designs | 1.35 | 0.9 | non_current_limiting | ferrule_or_knife_blade_class_H | H | 10 | NEC 240.60(B) permits use only when interrupting rating not exceeded; Class H physically fits Class R rejection holder if holder modified — safety concern; AHJ may reject use in high-fault locations | none | optional | UL_248-6 | 600 |
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