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UL/CSA Fuse Classes and Applications and Fuse Cross Reference

Time:2024-04-30   Author:As Beam   Browse:

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 semiconductor fuse|ABPowerBussmann KRP-CL Class L fuse data sheet No. 1016, Buss Fuses Chart.pdf

bussmann semiconductor fuse|ABPowerBussmann KLU Class L fuse data sheet No. 1013 Buss Fuse, Bussmann Fuse Catalog.pdf

bussmann semiconductor fuse|ABPowerBussmann KRP-C 601 to 2000A Class L fuse data sheet No. 1008, Buss Fuse, Bussmann Fuse Catalog.pdf

bussmann semiconductor fuse|ABPowerBussmann series KTU Class L fuse data sheet No. 1010 Buss Fuse Type.pdf



Littelfuse: KLPC, KLLU, LDC

bussmann semiconductor fuse|ABPowerLittelfuse KLLU Series - 600 VAC, Time-Delay, 601-4000 A, Littelfuse Cross Reference.pdf

bussmann semiconductor fuse|ABPowerLittelfuse LDC Series - 600 V - UL Class L All Purpose AC Fuse, DC Fuses , Bussmann Cross Reference KRP-CL.pdf

bussmann semiconductor fuse|ABPowerLittelfuse KLPC Series Catalog - 600 V - UL Class L Time-Delay Fuses , Bussmann Cross Reference.pdf


Mersen: A4BQ, A4BT, A4BY

bussmann semiconductor fuse|ABPowerDS-A4BT-Class-L-Time-Delay-Mersen Fuse Catalog.pdf

bussmann semiconductor fuse|ABPowerDS-A4BQ-Class-L-Time-Delay-Mersen, Current Limiting Fuse.pdf

bussmann semiconductor fuse|ABPowerDS-A4BY-Class-L-Time-Delay-Mersen Fuse Catalog, Bussmann Cross Reference.pdf




Bussmann Class L Fuse.jpg\

 

 

 


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 semiconductor fuse|ABPowerBussmann LPN-RK Fuse Catalog Class RK1 Buss Fuses Chart.pdf

bussmann semiconductor fuse|ABPowerBussmann 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 semiconductor fuse|ABPowerBussmann KTN-R 250V Class R fuse Fast Acting data sheet no. 1043, Class RK1 Fuse, Catalog.pdf

bussmann semiconductor fuse|ABPowerBussmann KTS-R — 600Vac, 1-600A, Fast-Acting Fuses,Buss Fuse Catalog.pdf

bussmann semiconductor fuse|ABPowerBussmann 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); 

bussmann semiconductor fuse|ABPowerLittelfuse LLNRK Series - UL Class RK1 Dual Element Time-Delay Fuse Catalog.pdf

bussmann semiconductor fuse|ABPowerLittelfuse LLSRK_ID Series - UL Class RK1 Dual Element Time-Delay Fuse Catalog.pdf



Fast Acting (KLNR, KLSR)

bussmann semiconductor fuse|ABPowerLittelfuse KLNR Series - UL Class RK1 Fast-Acting Fuses Catalog, Datasheet.pdf

bussmann semiconductor fuse|ABPowerLittelfuse 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)

bussmann semiconductor fuse|ABPowerMersen A2D-R-A6D-R Class RK1 Time Delay Fuse.pdf

bussmann semiconductor fuse|ABPowerMersen A2K-R-250V-A6K-R-600V Class RK1 Fast Acting Fuse.pdf



 

CLASS RK5 Fuse

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 semiconductor fuse|ABPowerBussmann Fusetron™ 600V Class RK5FRS-R 600 Vac, 300 Vdc, 65-600 A, dual element, time-delay fuses.pdf

bussmann semiconductor fuse|ABPowerBussmann 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

bussmann semiconductor fuse|ABPowerFLNR Series Datasheet Littelfuse FLNR Time Delay Fuses Provide Exceptional Overcurrent Protection with Indication.pdf

bussmann semiconductor fuse|ABPowerFLNR_ID Series - Littelfuse FLNR_ID Fuses Time Delay Dual Element.pdf

bussmann semiconductor fuse|ABPowerFLSR Series Datasheet Littelfuse FLSR Fuses CatalogTime Delay Dual Element.pdf

bussmann semiconductor fuse|ABPowerFLSR_ID Series Time Delay Littelfuse FLSR_ID Fuses Provide Exceptional Overcurrent Protection with Indication.pdf

bussmann semiconductor fuse|ABPowerIDSR Series - Littelfuse IDSR Time Delay Fuses Provide Exceptional Overcurrent Protection with Indication.pdf



Mersen Class RK5 Fuse: TR-R, TRS-R, TRS-RDC

bussmann semiconductor fuse|ABPowerMersen TR-R-TRS-R Class RK5 Time Delay Fuse Datasheet, Mersen Catalog.pdf

bussmann semiconductor fuse|ABPowerMersen TRS-RDC Class RK5 Time Delay Fuse Datasheet, Mersen Catalog.pdf




Bussmann Class RK5 Fuse.jpg


 

 

 

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)

bussmann semiconductor fuse|ABPowerBussmann Low-Peak™ LPJ Class J 600Vac, 300Vdc, 70-600A Dual Element Time Delay Fuses, Buss Fuse Catalog Datasheet.pdf

bussmann semiconductor fuse|ABPowerBussmann JKS fast-acting Class J fuses, 70 to 600 A, Buss Fuse Catalog Datasheet, Current Limiting Fuse.pdf



Littelfuse Class J Fuse: Time Delay(JTD_ID, JTD); Fast Acting( JLS)

bussmann semiconductor fuse|ABPowerLittelfuse JTD Series - UL Class J Time-Delay Fuses Datsheet, Bussmann Cross.pdf

bussmann semiconductor fuse|ABPowerLittelfuse JTD_ID Series - UL Class J Time-Delay Fuses with Indication.pdf

bussmann semiconductor fuse|ABPowerJLS Series - Littelfuse JLS Fuses Provide Fast-Acting Overcurrent Protection.pdf

bussmann semiconductor fuse|ABPowerLDFJ Series 600VAC 1-600A Littelfuse LDFJ Fuses Provide High-Speed Protection.pdf


Mersen Class J Fuse: Time Delay(AJT); Fast Acting( A4J, HSJ)

bussmann semiconductor fuse|ABPowerMersen AJT Class J Time-delay Fuse 600vac, 1-600A.pdf

bussmann semiconductor fuse|ABPowerMersen A4J Class J Fast-Acting Fuse 600V.pdf

bussmann semiconductor fuse|ABPowerMersen HSJ Class J High-Speed Fuse, Fast Acting Fuse, Mersen Fuse Datasheet Catalog.pdf



Bussmann Class J Fuse.jpg



 

 

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 semiconductor fuse|ABPowerBussmann series Low-Peak LP-CC Class CC fuse 600Vac,Max 30A datasheet No.1023 Buss Fuse.pdf

bussmann semiconductor fuse|ABPowerBussmann KTK-R Class CC Fast Acting fuse data sheet No. 1015.pdf

bussmann semiconductor fuse|ABPowerBussmannFNQ-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

bussmann semiconductor fuse|ABPowerCCMR Series - Littelfuse CCMR Fuses Offer POWR-PRO® Technology for Superior Small Motor Protection.pdf

bussmann semiconductor fuse|ABPowerKLKR Series - Littelfuse KLKR Fuses Provide Superior General Circuit Protection.pdf

bussmann semiconductor fuse|ABPowerKLDR Series - Littelfuse KLDR Fuses Provide Superior Transformer Protection.pdf


Mersen Class CC Fuse: Time Delay: ATDR (motors), ATMR (transformers) Fast Acting: ATQR

bussmann semiconductor fuse|ABPowerMersen ATDR Class CC Time-Delay Fuse Datasheet.pdf

bussmann semiconductor fuse|ABPowerMersen ATMR Class CC Fast Acting Fuse.pdf

bussmann semiconductor fuse|ABPowerMersen ATQR Class CC Time Delay Fuse.pdf



Bussmann Class CC Fuse.jpg

 

 

 

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)

bussmann semiconductor fuse|ABPowerJJN Limitron™ 300Vac, 1-1200A, fast-acting Class T fuses, Cooper Bussmann Catalog.pdf

bussmann semiconductor fuse|ABPowerBussmann JJS Limitron™ 600Vac, 1-800A, fast-acting Class T fuses, Buss Fuse.pdf



Littelfuse (JLLN, JLLS)

bussmann semiconductor fuse|ABPowerLittelfuse 300VAC JLLN Series - UL Class T Fast-Acting Fuse, Bussmann Cross.pdf

bussmann semiconductor fuse|ABPowerLittelfuse JLLS Series 600VAC UL Class T Fast-Acting Fuse, Bussmann Cross.pdf



Mersen (A3T, A6T)

bussmann semiconductor fuse|ABPowerMersen A3T-A6T Class T Fast-Acting Mersen Fuse Catalog.pdf


Bussmann Class T Fuse.jpg


 

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)

bussmann semiconductor fuse|ABPowerMersen AGClass G Fuse, 600VAC (0.5 to 20A), 480VAC (25 to 60A).pdf

bussmann semiconductor fuse|ABPowerLittelfuse SLC Series - Class G Medium Time-Lag Fuses Bussmann Cross.pdf

bussmann semiconductor fuse|ABPowerBussmann 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: NOS, NON

bussmann semiconductor fuse|ABPowerBussmann 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

bussmann semiconductor fuse|ABPowerMersen CRN-CRS Class-H Canadian Fuses 250V-600V.pdf

bussmann semiconductor fuse|ABPowerMrsen NRN-NRS-Class-H-Canadian-Fuses-250V-600V-Mersen.pdf



Bussmann Class H Fuse.jpg


 

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