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Electrical FUSE Class L

Class J Fuses

Class J non-renewable fuses are current-limiting and conform to 248-8. Current ratings of these fuses range from 0A to 600A, with a 600VAC voltage rating (also available with DC ratings). The interrupting rating is 200kA rms symmetrical, but a 300kA interrupting rating is also available with certain fuses. Time-delay versions are available, but the fuse must meet the UL optional time-delay test requirements of a minimum 10-sec opening time at 500% of fuse current rating.

 

Features:
	Highly Current Limiting AC & DC Ratings Compact Size Indication available on some brands/models Time-Delay available
Applications:
	Motor Control Centers Transformer Protection UL Listed series-rated molded case circuit breaker panels General purpose circuits: mains, feeders, and branch circuits Circuits containing solid state devices Resistive loads Drives Soft-starters

 

 

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Class L Fuses

Class L non-renewable fuses are current-limiting and are designed for the protection of feeders and service entrance equipment These fuses conform to UL 248-10 and current ratings range from 601A to 6000A, with a voltage rating of 600VAC (DC ratings are also available). The interrupting rating is 200kA rms symmetrical (300kA fuses are also available). Available case sizes include 800A, 1,200A, 1,600A, 2,000A, 2,500A, 3,000A, 4,000A, 5,000A, and 6,000A.

 

As with the other classes of fuses conforming to 248 (G, J, R, and T), Class L fuses must be labeled "Current Limiting" and can also carry the "Time Delay" mark, although the standard doesn't have a requirement for their time-delay characteristics.

 

Features:
	AC & DC Ratings Fast operation under short circuit conditions Time delay for high inrush loads without nuisance opening Highly current limiting
Applications:
	Mains, feeders Motors Lighting, Heating, and General Loads Circuit Breaker Back-up Metering Centers Panel boards and Switchboards Switchboards Panelboards Load Centers DC Applications

 

 

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Class RK1 Fuses

Class RK1 are non-renewable fuses that conform to UL 198E. Current ratings range from 0A to 600A, with voltage ratings of 250VAC and 600VAC (DC ratings are also available). They have an interrupting rating of 200kA rms symmetrical (300kV symmetrical also available) and are closely related to the RK1 fuse.

Class RK1 fuses are actually Class K-1 fuses with ferrules and knife blades modified to conform to Class R rejection requirements. The grooved ring in the ferrule and the slot in the knife blade, when used in conjunction with special fuseholders designed to accept Class R fuses only, prevent interchanging of any other fuse class with the installed Class R fuse.

The fuses must be labeled "Current Limiting" and can be labeled "Time Delay", indicating that they meet the optional time-delay test by not opening in less than 10 seconds at 500% of fuse ampere rating.

 

Features:
	High current limitation for low peak let-thru current Rejection feature prevents replacement errors Fast Acting Low I2T Solution for high-fault circuits
Applications:
	Branch and feeder circuits AC Drives Load Centers Panel boards and Switchboards Non-inductive loads General purpose applications including lighting and heating

 

 

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Class CC Fuses

Class CC non-renewable fuses are current-limiting and intended for the protection of components sensitive to short-time overloads, noninductive loads, and short-circuit protection of motor circuits. Current ratings range from 0A to 30A, with a voltage rating of 600VAC (DC ratings are also available). The interrupting rating is 200kA rms symmetrical.

These fuses must be labeled Current Limiting, and have the option to be labeled Time Delay. The optional time-delay test requirements, a minimum 12-sec opening time at 200% fuse current rating, is different than that of other larger body fuses.

 

Features:
	AC & DC Ratings Time delay compatible with for motor starting/small control transformers Rejection feature prevents replacement errors Improved cycling ability
Applications:
	Control Transformers Solenoids Branch Circuit Protection Small Motors Lighting, Heating, and General Loads IEC Devices

 

 

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Class RK5 Fuses

Class RK5 are non-renewable fuses that conform to UL 198E. Current ratings range from 0A to 600A, with voltage ratings of 250VAC and 600VAC (DC ratings are also available). They have an interrupting rating of 200kA rms symmetrical and are closely related to the RK5 fuse.

Class RK5 fuses are actually Class K-5 fuses with ferrules and knife blades modified to conform to Class R rejection requirements. The grooved ring in the ferrule and the slot in the knife blade, when used in conjunction with special fuseholders designed to accept Class R fuses only, prevent interchanging of any other fuse class with the installed Class R fuse.

The fuses must be labeled "Current Limiting" and can be labeled "Time Delay", indicating that they meet the optional time-delay test by not opening in less than 10 seconds at 500% of fuse ampere rating.

 

Features:
	High current limitation for low peak let-thru current Rejection feature prevents replacement errors Fast Acting Low I2T Solution for high-fault circuits
Applications:
	Branch and feeder circuits AC Drives Load centers Panel boards and Switchboards Non-inductive loads General purpose applications including lighting and heating

 

 

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Class T Fuses

Class T fuses are non-renewable, current-limiting, and conform to UL 198H. Current ratings range from 0A to 1200A for 300V rated fuses, and 0A to 1,200A for 600VAC rated fuses (DC ratings are also available). The interrupting rating is 200kA rms symmetrical and these fuses are designed for protection of feeders and branch circuits in accordance with the NEC. Class T fuses must be labeled "Current Limiting", and may be labeled "Time Delay" if they pass time-delay requirements.

Features:
	High current limitation for low peak let-thru current Rejection feature prevents replacement errors AC & DC Ratings Compact Size Fast Acting
Applications:
	Load Centers Panel boards and Switchboards Back up for Circuit Breakers Metering Centers Non-inductive loads General purpose applications including lighting and heating

 

 

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Class G Fuses

Class G Fuses are non-renewable, current-limiting, and conform to UL 198C. Current ratings range from 25A to 60A for 480VAC rated fuses, and 0A to 20A for 600VAC rated fuses (DC ratings are also available). Developed for use in lighting and appliance panelboards with a special fusible-switch unit, these non-renewable cartridge fuses are intended for use where interrupting ratings to 100kA rms symmetrical are required. They're made in four ferrule sizes: 0A to 15A, 16A to 20A, 21A to 30A, and 31A to 60A.

Class G fuses must be labeled "Current Limiting", and may be labeled "Time Delay" if they pass time-delay requirements, which is minimum opening time of 12 sec at 200% of the fuse ampere rating. This requirement is different than the optional time-delay test for larger body size Class H, K, and R fuses, where the minimum opening time is 10 seconds at 500% of fuse ampere rating (8 seconds for 0A to 30A, 250V, Class K and R fuses).

 

Features:
	Four unique sizes Rejection feature prevents replacement errors Compact Size AC & DC Ratings
Applications:
	Light inductive loads including motors and solenoids Branch Circuits Appliances General purpose applications including lighting

 

 

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Class Midget Fuses

Midget fuses are cylindrical in shape with a ferrule at either end. Current ratings do not exceed 30A and voltage ratings ranging from 125VAC to 600VAC (some DC ratings are available). They cannot be installed in fuse holders intended for Class G, H, J, K, L, R, or T fuses. The diameter varies from 0.25" to 0.42", with lengths ranging approximately 1.25" to 1.6." Both Fast Acting and Time Delay varieties are available.

Features:
	Fast Acting or Time Delay versions Economical supplemental protection Compact Dimensions Indication available in some models
Applications:
	Supplemental protection of circuits Solenoid and some control circuits Semiconductor protection Lighting Meter circuits General purpose circuits

 

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