1. Full Range of Bussmann UL Class Fuses (UL248 Standard, Genuine Eaton Bussmann OEM).

UL Class is a classification defined under North American NEC standards. It covers nine categories: CC, G, J, H, K, RK1, RK5, T and L, categorized by physical dimension, interrupting rating, current-limiting performance and rejection feature. All variants carry UL Listed certification. Bussmann groups its products into three core product lines: Low-Peak (dual-element time-delay), Limitron (fast-acting), Fusetron (economy time-delay)。

2. Class CC (Compact size for control circuits, 600V, rejection design to prevent wrong/reverse installation)

Three Class CC series available:

Specifications: 600VAC, 1/10A ~ 30A, 200kA interrupt rating (full current-limiting). Dimension: φ10.3×38.1mm. Rejection base prevents installation of standard non-rated fuses.

Bussmann catalog numbers:

· KTK-R: Limitron fast-acting (for lighting & electronic circuits)

· FNQ-R: Fusetron dual-element time-delay (for transformers & small motors)

· LP-CC: High-precision Low-Peak time-delay (for selective coordination protection)

Common selections: KTK-10, FNQ-R10 (frequently inquired models)。

3. Class G (For low-power equipment, rejection via varying fuse length per ampere rating)

600V, 0.5A ~ 60A, 100kA interrupt rating; fast-acting at ≤6A, time-delay from 7A to 60A. Unique body lengths per amp rating stop oversize wrong fuse fitting.

Bussmann option: SC Series

4. Class J (Industry standard for power branch circuits, compact bolt-on construction, 600V)

Available in LPJ & JKS Class J versions:

600VAC, 1A ~ 600A, standard 200kA interrupt rating; Bussmann LPJ series reaches 300kA. Fully current-limiting with exclusive body shape for rejection protection.

Bussmann catalog numbers:

· LPJ-SP: Low-Peak dual-element time-delay (absorbs motor inrush current, minimum 10s delay at 5×In)

· JKS: Limitron fast-acting (short-circuit instant protection)

5. Class H / Class K5 (Legacy general-purpose type, non-current-limiting, cost-effective)

Class H available in NON / NOS types:

600V, 5A ~ 600A, only 10kA interrupt rating, non-current-limiting. Class H features replaceable fuse links; Class K5 is current-limiting with identical outline dimension.

Bussmann options: NON/NOS (fast-acting), REN/RES (replaceable link type)

6. Class RK1 / RK5 (Most popular cylindrical construction, standard for industrial applications)

· RK1: High current-limiting, 600V, 1/10A~600A, 200kA interrupt rating; FRN-R/FRS-R = time-delay, KRN = fast-acting

· RK5: Economy-grade current-limiting with inferior time-delay performance vs RK1, same outer dimension at lower cost; PVS-R = RK5 dedicated for PV systems

Classic Bussmann items: FRN-R-30, FRS-R-60

7. Class T (Ultra-fast fuses for semiconductor device protection)

600V, 1A ~ 600A, ultra-high current-limiting with extremely fast opening speed; Bussmann JJN/JJS Series (for output side of inverters & thyristors)

8. Class L (High-current bolt-on fuses for main busbar & switchgear feeder)

Core model: KRP-C for Class L

600VAC, 601A ~ 6000A, 200~300kA AC interrupt rating, used as main incoming feeder fuses in power distribution cabinets.

Bussmann catalog numbers:

· KRP-C-SP: Low-Peak time-delay

· KTU: Fast-acting

· KLU: Economy time-delay

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