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UL/CSA Fuse Classes and Applications and Fuse Cross Reference
Fuses compliant with the specifications for current limiting fuses should be marked as "Current Limiting." The label should specify the UL/CSA fuse class, manufacturer's name or logo, current rating, AC/DC voltage rating, and AC/DC interrupting rating. If the fuse meets time delay requirements, labels may also include "Time Delay," "D," "TD," or equivalent.
1. CLASS L Fuse
Standards: UL Standard 248-10, CSA Standard C22.2, No. 106, categorized as HRCI-L
Voltage Rating: 600 volts, AC/DC
Current Ratings: 601-6000 amps; KLPC available 200-600A; LDC available 150-600A
Interrupting Rating: AC: 200,000 amps rms symmetrical; DC: 50,000, 100,000, or 200,000 amps
Time Delay: Can be labeled "Time-Delay," but UL does not assess time-delay features for Class L fuses.
Typical Application: Large distribution switchboards, Power panelboards, Large machinery disconnects
Manufacturers:
Bussmann: KRP-C-SP, KTU, KLU, KRP-CL
Bussmann KRP-CL Class L fuse data sheet No. 1016, Buss Fuses Chart.pdf
Bussmann KLU Class L fuse data sheet No. 1013 Buss Fuse, Bussmann Fuse Catalog.pdf
Bussmann KRP-C 601 to 2000A Class L fuse data sheet No. 1008, Buss Fuse, Bussmann Fuse Catalog.pdf
Bussmann series KTU Class L fuse data sheet No. 1010 Buss Fuse Type.pdf
Littelfuse: KLPC, KLLU, LDC
Littelfuse KLLU Series - 600 VAC, Time-Delay, 601-4000 A, Littelfuse Cross Reference.pdf
Littelfuse KLPC Series Catalog - 600 V - UL Class L Time-Delay Fuses , Bussmann Cross Reference.pdf
Mersen: A4BQ, A4BT, A4BY
DS-A4BT-Class-L-Time-Delay-Mersen Fuse Catalog.pdf
DS-A4BQ-Class-L-Time-Delay-Mersen, Current Limiting Fuse.pdf
DS-A4BY-Class-L-Time-Delay-Mersen Fuse Catalog, Bussmann Cross Reference.pdf
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2. CLASS R Fuse
Standards: UL Standard 248-12, CSA Standard C22.2, No. 106, categorized as HRCI-R
Voltage Ratings: 250 and 600 volts, AC; 125 and 300 volts, DC
Current Ratings: 0-600 amps
Interrupting Rating: 200,000 amps rms symmetrical
Classes: RK1 and RK5
Time Delay: Optional; must sustain 500% current rating for at least ten seconds.
Typical Application: Panelboard, Motor control centers, Combination starters, Machinery disconnects
Manufacturers:
Bussmann Class RK1 Fuse:
Time Delay (LPN-RK, LPS-RK);
Bussmann LPN-RK Fuse Catalog Class RK1 Buss Fuses Chart.pdf
Bussmann LPS-RK — 600 Vac-300 Vdc, 70-600 A,Buss Fuse Catalog.pdf
Fast-acting (KTN-R, KTS-R, KWN-R and KWS-R)
Bussmann KTN-R 250V Class R fuse Fast Acting data sheet no. 1043, Class RK1 Fuse, Catalog.pdf
Bussmann KTS-R — 600Vac, 1-600A, Fast-Acting Fuses,Buss Fuse Catalog.pdf
Bussmann series 250Vac_dc KWN-R and 600Vac_dc KWS-R Data Sheet No. 10413, Fast Acting Fuse.pdf
Littelfuse Class RK1 Fuse:
Time Delay ( LLNRK, LLSRK, LLSRK_ID);
Littelfuse LLNRK Series - UL Class RK1 Dual Element Time-Delay Fuse Catalog.pdf
Littelfuse LLSRK_ID Series - UL Class RK1 Dual Element Time-Delay Fuse Catalog.pdf
Fast Acting (KLNR, KLSR)
Littelfuse KLNR Series - UL Class RK1 Fast-Acting Fuses Catalog, Datasheet.pdf
Littelfuse KLSR Series - UL Class RK1 Fast Acting Fuse Catalog, Datasheet.pdf
Mersen Class RK1 Fuse: Time Delay (A2D-R, A6D-R); Fast-acting (A2K-R, A6K-R)
Mersen A2D-R-A6D-R Class RK1 Time Delay Fuse.pdf
Mersen A2K-R-250V-A6K-R-600V Class RK1 Fast Acting Fuse.pdf
Degree of Current Limitation: Moderate
Time Delay: Optional
Typical Application: Motor control centers, Combination starters, Machinery disconnects
Manufacturers:
Bussmann Class RK5 Fuse: FRN-R, FRS-R
Bussmann Fusetron™ FRN-R Class RK5 250Vac-125Vdc data sheet for up to 60 amps No. 1019.pdf
Littelfuse Class RK5 Fuse: FLNR, FLNR_ID, FLSR, FLSR_ID, and IDSR
FLNR_ID Series - Littelfuse FLNR_ID Fuses Time Delay Dual Element.pdf
FLSR Series Datasheet Littelfuse FLSR Fuses CatalogTime Delay Dual Element.pdf
Mersen Class RK5 Fuse: TR-R, TRS-R, TRS-RDC
Mersen TR-R-TRS-R Class RK5 Time Delay Fuse Datasheet, Mersen Catalog.pdf
Mersen TRS-RDC Class RK5 Time Delay Fuse Datasheet, Mersen Catalog.pdf
3. CLASS J Fuse
Standards: UL Standard 248-8, CSA Standard C22.2, No. 106, categorized as HRCI-J
Voltage Rating: 600 volts, AC
Current Ratings: 0-600 amps
Interrupting Rating: 200,000 amps rms symmetrical
Typical Application:
• Power panelboards
• Branch circuit breaker panelboard mains
• Machinery disconnects
• Industrial control
Manufacturers:
Bussmann Class J Fuse: Time Delay(LPJ_SP, LPJ_SPI); Fast Acting( JKS)
Littelfuse Class J Fuse: Time Delay(JTD_ID, JTD); Fast Acting( JLS)
Littelfuse JTD Series - UL Class J Time-Delay Fuses Datsheet, Bussmann Cross.pdf
Littelfuse JTD_ID Series - UL Class J Time-Delay Fuses with Indication.pdf
JLS Series - Littelfuse JLS Fuses Provide Fast-Acting Overcurrent Protection.pdf
LDFJ Series 600VAC 1-600A Littelfuse LDFJ Fuses Provide High-Speed Protection.pdf
Mersen Class J Fuse: Time Delay(AJT); Fast Acting( A4J, HSJ)
Mersen AJT Class J Time-delay Fuse 600vac, 1-600A.pdf
Mersen A4J Class J Fast-Acting Fuse 600V.pdf
Mersen HSJ Class J High-Speed Fuse, Fast Acting Fuse, Mersen Fuse Datasheet Catalog.pdf
4. CLASS CC/CD Fuse
Standards: UL Standard 248-4, CSA Standard C22.2, No. 106, categorized as HRCI Misc.
Voltage Rating: 600 volts, AC
Current Ratings: Class CC: 0-30 amps; Class CD: 35-60 amps
Interrupting Ratings: 200,000 amps rms symmetrical
Bussmann Class CC Fuse: Time Delay: LP-CC (motors), FNQ-R (transformers) Fast Acting: KTK-R
Bussmann series Low-Peak LP-CC Class CC fuse 600Vac,Max 30A datasheet No.1023 Buss Fuse.pdf
Bussmann KTK-R Class CC Fast Acting fuse data sheet No. 1015.pdf
BussmannFNQ-R Class CC Fuse Data Sheet No. 1014, LIMITRON 600Vac Buss Fuse.pdf
Littelfuse Class CC Fuse: Time Delay: CCMR (motors), KLDR (transformers) Fast Acting: KLKR
KLKR Series - Littelfuse KLKR Fuses Provide Superior General Circuit Protection.pdf
KLDR Series - Littelfuse KLDR Fuses Provide Superior Transformer Protection.pdf
Mersen Class CC Fuse: Time Delay: ATDR (motors), ATMR (transformers) Fast Acting: ATQR
Mersen ATDR Class CC Time-Delay Fuse Datasheet.pdf
Mersen ATMR Class CC Fast Acting Fuse.pdf
Mersen ATQR Class CC Time Delay Fuse.pdf
5. CLASS T Fuse
Standards: UL Standard 248-15, CSA Standard C22.2, No. 106, categorized as HRCI-T
Voltage Ratings: 300 and 600 volts, AC; 125 and 300 volts, DC
Current Ratings: 0-1200 amps (900-1200 amps UL Recognized for 600V version)
Interrupting Rating: 200,000 amps rms symmetrical
Type: Fast-Acting
Typical applications:
• Large apartment complexes
• Multi-family meter stacks
• VFD line protection
Manufacturers:
Bussmann (JJN, JJS)
JJN Limitron™ 300Vac, 1-1200A, fast-acting Class T fuses, Cooper Bussmann Catalog.pdf
Bussmann JJS Limitron™ 600Vac, 1-800A, fast-acting Class T fuses, Buss Fuse.pdf
Littelfuse (JLLN, JLLS)
Littelfuse 300VAC JLLN Series - UL Class T Fast-Acting Fuse, Bussmann Cross.pdf
Littelfuse JLLS Series 600VAC UL Class T Fast-Acting Fuse, Bussmann Cross.pdf
Mersen (A3T, A6T)
Mersen A3T-A6T Class T Fast-Acting Mersen Fuse Catalog.pdf
6. CLASS G Fuse
Standards: UL Standard 248-5, CSA Standard C22.2, No. 106, categorized as HRCI Misc.
Voltage Rating: 480 volts, AC
Current Ratings: 0-60 amps
Interrupting Rating: 100,000 amps rms symmetrical
Typical applications:
• Fusible branch circuit panelboards
• HVAC branch circuit protection
Manufacturers: Bussmann (SC), Littelfuse (SLC), Mersen (AG)
Mersen AGClass G Fuse, 600VAC (0.5 to 20A), 480VAC (25 to 60A).pdf
Littelfuse SLC Series - Class G Medium Time-Lag Fuses Bussmann Cross.pdf
Bussmann series SC Class G Fuse Data Sheet No. 1024 600VAC 480Vac 60A Size Rejecting Fuse.pdf
7. CLASS K Fuse
Standards: UL Standard 248-9 (No CSA Standard)
Voltage Ratings: 250 and 600 volts, AC
Current Ratings: 0-600 amps
Interrupting Ratings: 50,000, 100,000, and 200,000 amps rms symmetrical
Time Delay: Optional; must sustain 500% current rating for at least ten seconds.
8. Supplementary Overcurrent Protection Fuses
Standards: UL Standard 248-14; CSA Standard C22.2, No. 59-1
Classifications: Micro Fuses, Miniature Fuses, Miscellaneous Cartridge Fuses
(1).Micro Fuses
Voltage Ratings: UL 125 volts; CSA 0-250 volts
Current Ratings: UL 0-10 amps; CSA 0-60 amps
Interrupting Rating: 50 amps rms symmetrical
Time Delay: Optional; minimum delay at 200% fuse rating: 5 seconds for fuses rated 3 amps or less, 12 seconds for fuses rated more than 3 amps
(2).Miniature Fuses (Supplemental Fuses)
Voltage Ratings: UL 125 or 250 volts; CSA 0-600 volts
Current Ratings: UL 0-30 amps; CSA 0-60 amps
Interrupting Rating: 10,000 amps rms symmetrical
Time Delay: Optional; minimum delay at 200% fuse rating: 5 seconds for fuses rated 3 amps or less, 12 seconds for fuses rated more than 3 amps
(3).Miscellaneous Cartridge Fuses (Supplemental Fuses)
Voltage Ratings: UL 125-1000 volts; CSA 0-100 volts
Current Ratings: UL 0-30 amps; CSA 0-60 amps
Interrupting Ratings: 10,000, 50,000, or 100,000 amps rms symmetrical
Time Delay: Optional; minimum delay at 200% fuse rating: 5 seconds for fuses rated 3 amps or less, 12 seconds for fuses rated more than 3 amps
9. Special Purpose Fuses
Voltage Ratings: Up to 1000 volts, AC/DC
Ampere Ratings: Up to 6000 amperes
Interrupting Ratings: Up to 200,000 amperes
Characteristics: Designed for specific types of electrical or electronic equipment, such as diodes, SCR, transistors, thyristors, capacitors, integrally fused circuit breakers, parallel cable runs, etc.
Note: Fuses may be UL Recognized for use as a component in UL Listed equipment. UL Recognized fuses undergo testing for characteristics like published interrupting capacity and are covered by UL re-examination services. They are non-renewable.
10. Non-Current Limiting Fuses
Standards: UL Standard 248-6; CSA Standard C22.2, No. 59.1
Also Known As: NEMA Class H, sometimes referred to as "NEC" or "Code" fuses
Voltage Ratings: 250 and 600 volts, AC
Ampere Ratings: 0-600 amps
Interrupting Ratings: 10,000 amps rms symmetrical
Type: One-Time Fuses
Time Delay: Optional; time-delay fuses must hold 500% current rating for a minimum of ten seconds.
Typical applications
• Light duty circuit locations
Manufacturers:
Bussmann series NON and NOS Class H(K) 250V and 600V fuse data sheet no. 1030 Buss Fuses.pdf
Littelfuse: NLKP
Mersen: CRN, CRS, NRN, NRS
Mersen CRN-CRS Class-H Canadian Fuses 250V-600V.pdf
Mrsen NRN-NRS-Class-H-Canadian-Fuses-250V-600V-Mersen.pdf
This overview provides a comprehensive understanding of various fuse classes, aiding users in better comprehending their applications and characteristics. Always refer to manufacturer datasheets and guidelines for detailed information and proper selection.
New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc.
TAG: Class J Fuse Class L Fuse Class T Fuse Class H Fuse Class K Fuse Class CC Fuse Cooper Bussmann Bussmann Fuse Littelfuse Mersen Fuse