Sites:
Home > Technical Library > Electrical and Electronics > Electrical Distribution and Protection > Reduce Arc Flash Energies by Upgrading to A6D Class RK1-Fuses (.pdf)

Reduce Arc Flash Energies by Upgrading to A6D Class RK1-Fuses

From Mersen

Arc flash incident energies can often be significantly reduced by simply replacing UL Class RK5, Class K, and Class H fuses with A6D UL Class RK1 fuses. This is an easy and inexpensive solu¬tion, since the A6D fuses fits into the same fuse holders. Please note that Class H fuses are not current limiting and have a very low interrupting rating. If there are any of these left in your system you should plan to retire these as soon as safely possible.

Upgrading to A6D Class RK1 fuses can reduce arc flash energies because these fuses have lower let-through energies in their current limiting range and lower current limiting thresholds.

Read the Whole Article
Products & Services
Fuse Holders
Fuse holders are devices for containing, protecting and mounting fuses. Blown fuses can be changed quickly and easily when used in conjunction with a fuse holder.
Product Announcements
Mersen - Select-a-Fuse from Mersen available online
With Mersen's Select-A-Fuse® Online, you can quickly and accurately choose the right overcurrent fuse protection for low- and medium-voltage motors, power and control transformers, and general... (read more)
GE Industrial Solutions - GE's MV LIS Retrofit Solution
Many Load Interrupter Switches (LIS) use fuses, which may provide poor fault current interrupting times, resulting in high Arc Flash hazard. GE's MV LIS Retrofit solution provides reduced Arc Flash... (read more)
Mersen - Reduced Lead Times on Mersen Semiconductor Fuses
MERSEN PSC PROTECTION SEMICONDUCTOR FUSES SHIP IN TEN DAYS! New North American Production Capabilities Reduce Lead Times... (read more)
Littelfuse, Inc. - New 804 Series TE UMF Time-Lag Subminiature Fuses
Littelfuse today introduced its new 804 Series of TE time-lag subminiature fuses, designed to protect AC circuits from damaging overcurrent. The new fuse series is the best in the industry in terms of... (read more)
Mersen - New Line of Non-Indicating Class RK5 fuses
Mersen (formerly Ferraz Shawmut) recently launched its new line of non-indicating Class RK5 fuses. With this addition, a complete line of Class RK5 fuses, both indicating (SmartSpot®) and... (read more)
Mersen - Medium Voltage Fuses E-Rated
5kV ** FERRULE MOUNTED FUSES Amp-trap CS-3 E-rated 5kV, 8kV and 15kV fuses have 2 or 3 Inch diameter barrels with ferrules and are mounted in spring reinforced clips. They are UL listed as "general... (read more)
Mersen - Medium Voltage Fuses
Mersen (formerly Ferraz Shawmut) offers medium voltage fuses in a full range of ratings and configurations to meet today's most demanding medium voltage applications. (read more)
Mersen - UltraSafe Fuse Holders
Mersen UltraSafeTM modular 600 volt Fuse Holders for Class J fuses introduce a new level of safety and ease for installing or replacing Class J fuses. UltraSafe holders qualify as "finger safe" to an... (read more)
Topics of Interest

Current limiting fuses can reduce both the magnitude and duration of a fault current. A UL Listed, current limiting fuse must clear a short circuit current in less than one half cycle in its current...

Current-limiting fuses can limit arc flash incident energy to low values provided that the arcing fault current exceeds the fuse's threshold current. Threshold current is defined as the lowest...

The arc flash hazard calculation method proposed in IEEE 1584 is based on tests with the arcing electrodes in a vertical plane and the calorimeters arranged at 90° to this plane. In this paper the...

Fuses are relatively inexpensive protection devices connected into circuits to open the circuit and de-energize the apparatus to prevent or limit damage due to an overload or short circuit. Fuses are...

Arc flash incident energy calculations are frequently above 40 cal/cm2 for equipment connected directly to the secondary of power transformers. In some cases, it may be possible to reduce energies...