What is a UL class rk5 fuse?
A UL Class RK5 fuse is a current limiting time delay fuse that is rated to interrupt a minimum of 200,000 amps. The UL Class RK5 fuse is less expensive but less current limiting than the Class RK1 fuse. It has a dual element construction. RK5 fuses are rated at either 250 or 600 volts AC. Ampere ratings range from 1/10 to 600 amps.
What is a Class T fuse used for?
Class T fuses can be used in applications that require fastacting protection, such as equipment containing variable speed drives, rectifiers, and other surge-sensitive components. Main switches containing Class T fuses may be used to provide protection to individual electric services and meter stacks.
What is a Class H fuse used for in Canada?
They replace all Class H fuses which have only a 10,000 ampere interrupting rating. They are suitable for use in many residential and smaller commercial and industrial applications. NLKP series fuses are Canadian “Code” fuses specifically designed to meet Canadian Electrical Code Type P fuse requirements for residential use.
What brand of Fuse is used in Bussmann fuses?
Bussmann uses the Fusetron® brand name for its UL Class RK5 fuses. Littelfuse markets its Class RK5 fuses under the POWR-PRO® and Indicator® brand names. Mersen uses the Tri-Onic® and SmartSpot® brand names.
What are Class K5 fuses used for?
UL Class H and K5 fuses are used as replacement fuses for overcurrent protection in older HVAC installations. These fuses are dimensionally the same, so they can be interchanged to change from a current-limiting system using Class K fuses to a noncurrent-limiting system using Class H fuses.
What are the different classes of fuses?
UL Fuse Classification ChartUL CLASSFUSE OVERLOAD CHARACTERISTICSINTERRUPTING RATING, AMPERESCDTIME-DELAY200,000GTIME-DELAY100,000K5FAST-ACTING50,000HRENEWABLE FUSES FAST-ACTING10,00012 more rows
What is K rated fuse?
Class K fuses. These non-renewable fuses are available in 250VAC and 600VAC ratings, with current ratings from 0A to 600A. Class K fuses are available with DC ratings. The interrupting ratings may be 50kA, 100kA, or 200kA rms symmetrical.
What are Class H and K fuses?
Class H has a small interrupt capacity of 10,000A. Some are current-limiting, but only up to their interrupt capacity. You can't tell if they are current-limiting, because none of them are marked. Class K fuses come in two interrupt ratings: 50,000A and 100,000A.
What are the 5 types of fuses?
The low voltage fuses are divided into five types and those are of the rewirable, cartridge, drop out, striker, and switch fuses.
What are the 3 types of fuses?
Classification of Fuses Fuses can be classified as “One Time Only Fuse”, “Resettable Fuse”, “Current limiting and non – current limiting fuses” based on the usage for different applications.
What does Class J fuse mean?
A Class J fuse is a 600 volt AC current limiting, fuse that is rated to interrupt a minimum of 200,000 amps. Bussmann, Littelfuse and Mersen self-certify their Class J fuses to a 300,000 interrupting rating,. Class J fuses are offered in fast acting, or time delay versions.
What are Class J fuses used for?
Class J fuses are commonly used in branch circuits, motor circuits, mains, feeders, control panels, electronic motor controllers, drives, soft-starters, circuit breaker back-up, transformers, load centers, lighting, heating and general loads to name a few.
What is the difference between Class R and Class J fuses?
All Class R fuses must be labeled “Current Limiting.” They may 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. Class J fuses. These non-renewable fuses are current-limiting and conform to 248-8.
Are Class K fuses current limiting?
Class K fuses are not permitted to be labeled Current Limiting because there is no rejec- tion feature as required by NEC® Article 240-60(B). INTERRUPTING RATING: 200,000 amps rms symmetrical Not interchangeable with any other UL fuse class.
What does H stand for on a fuse?
H. High Breaking Capacity. L. Low Breaking Capacity. Note: Many small cartridge fuses will have additional markings stamped on the end caps.
What is a FRS R fuse?
FRS-R — 600Vac/300Vdc, 1⁄10-60A, Dual Element, Time-Delay Fuses. Description: Advanced protection, energy efficient Class RK5. dual element, current-limiting, time-delay fuses with optional. open fuse indication on select ratings. Time-delay – 10 second (minimum) at 500% of rated current.
What is a UL class RK5 fuse?
A UL Class RK5 fuse is a current limiting time delay fuse that is rated to interrupt a minimum of 200,000 amps. The UL Class RK5 fuse is less expensive but less current limiting than the Class RK1 fuse. It has a dual element construction.
What brand of fuses does Bussmann use?
Bussmann, Littelfuse and Mersen offer Class RK5 fuses. Bussmann uses the Fusetron® brand name for its UL Class RK5 fuses. Littelfuse markets its Class RK5 fuses under the POWR-PRO® and Indicator® brand names. Mersen uses the Tri-Onic® and SmartSpot® brand names.
What is a class T fuses?
Class T fuses can be used in applications that require fastacting protection, such as equipment containing variable speed drives, rectifiers , and other surge-sensitive components. Main switches containing Class T fuses may be used to provide protection to individual electric services and meter stacks.
What is a fuse label?
UL and CSA are the most common fuse certifications used in North America. The fuse label may provide information on the applicable AC or DC voltage, the maximum current rating and other information such as “interrupting rating”, “current limiting”, “time-delay” and “fast-acting”.
What is a time delay fuse?
Time-delay: A fuse in which the burnout action depends on the time it takes for the overcurrent heat to build up in the fuse and melt the fuse element. Fast-acting: A fuse that opens on overload and short-circuits very quickly.
Can AC rated fuses be used in DC circuits?
AC rated fuses SHOULD NOT be used in DC voltage circuits unless DC application ratings are provided by the fuse manufacturer. The characteristics and certification of the fuses are usually defined on the fuse label. UL and CSA are the most common fuse certifications used in North America.
