Products by Mersen (formerly Ferraz Shawmut)

For Type 2, no damage circuit protection in all the configurations you need. By opening in less than 1/4 cycle under short circuit conditions, Amp-trap 2000® fuses current limit enough to prevent undue downstream damage — and therefore comply with the extra-stringent IEC, Type-2 standard. In...

The Surge-Trap® Pluggable SPD provides advanced overvoltage protection by utilizing Mersen's (formerly Ferraz Shawmut) patented TPMOV design, which does not require fuses, a fuse holder or additional wiring in meeting the UL 1449 Third Edition standards thus providing substantial cost savings and...

Tri-Onic® SmartSpot® TR and TRS fuses provide an optional visual open fuse indicator. With advanced material technology added to the existing product line the TR and TRS current-limiting time-delay fuses are engineered for overcurrent protection of motors and transformers, service entrance...

A4J Class J fuses deliver excellent current-limiting protection to a wide variety of applications. Their unique dimensions prevent the substitution of other fuses with lower voltage ratings, interrupting ratings, or current-limiting capability

The High Speed J (HSJ) combines the low I2t of a semiconductor fuse and the branch circuit performance of a Class J UL listed fuse. This fuse was designed for the starting characteristics of solid state motor controllers. The HSJ can provide branch circuit protection per NEC requirements, as well...

When it comes to protecting service entrance equipment, feeder circuits, and circuit breakers, A4BY fuses have been the industry's favorite. The A4BY is a 100% rated device and may be applied at continuous currents up to its ampere rating. A 4-second minimum time delay at 500% rating allows the...

Fast acting A3T and A6T Class T fuses combine two highly desirable features - high current limitation and a small physical size. Their unique dimensions prevent the substitution of other fuses with lower voltage ratings or current limiting capability. These fuses have glass melamine bodies for...

Current-limiting A2K and A6K fuses provide excellent protection where high available short circuit currents exist. These fast-acting fuses are particularly good for branch/feeder circuits and back-up protection

Mersen's international range of midget and miniature dimension and PC mount fuses offer you all the protection you require. A wide range of ratings. Special characteristics like time-delay and low I2t. All within a footprint of 1-1/2” x 13/32” or less.

Mersen affords OEM designers and equipment-maintenance personnel a comprehensive line of Form 101 semiconductor protection fuses in ratings from 130 to 1500VAC. Plus, Square Body North American and European-Dimension semiconductor fuses in 690/700 and 1250/ 1300V ratings (four sizes of each). Plus,...

On one hand, you need current-limiting protection for medium-voltage transformers and distribution systems. On the other, you need short circuit protection for medium-voltage motors and motor controllers. Mersen's line of medium-voltage UL Listed fuses fills the bill with E-rated, R-rated and...

Mersen offers you the benefits of a truly global supplier. From the one-stop shopping advantages of our complete line of European and North American fuses, holders, and accessories. To our pursuit of other international technologies. To our definitive understanding of international circuit...

No matter how specialized your application is, Mersen brings its broad expertise and numerous resources to bear on it. The result is a line of Special Purpose Fuses that unfailingly perform to application-specific requirements. Whether you’re specifying our Cable Protectors, Welder Protectors, and...

Mersen's extensive line of fuses is matched by our selection of fuse blocks and holders. Choose from a wide range of traditional and space-saving fuse blocks, panel-mount and in-line holders, modular semiconductor fuse holders and more.

Devices like box covers, fuse reducers, fuse pullers and clip clamps may seem inconsequential, but well-designed circuit protection accessories can increase worker safety and even improve circuit protection. Find them all right here.

The safest way to switch power on and off in industrial control panels is with Mersen disconnect switches. Our extensive line includes UL 98 fusible and non-fusible switches, UL 508 switches, and our high-performance Surge Switch, designed to withstand the high surge current of today's transient...

Mersen's High Power Switches are engineered to meet your needs. High Power Switches are critical to your operation. Not only do they help protect your people from injury, they help protect your equipment and processes, and minimize the risk of costly downtime and repairs. You need a switch that...

Mersen, an industry pioneer in surge protection technology, has developed a world-class suite of surge protection devices for your entire facility. Surge-Trap SPDs are designed to UL1449 3rd Edition standards and feature Mersen's industry leading patented TPMOV® technology inside. Providing...

Mersen’s (formerly Eldre’s) reputation for outstanding technical expertise and quality is the result of a half -century of design and manufacturing of bus bars. Our staff of professional engineers and experienced designers works together to develop state-of-the-art tooling and manufacturing...