Mersen Amp-Trap Back-Up R-Rate...
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Mersen Amp-Trap Back-Up R-Rated Medium Voltage Fuse, 2R, 4800VAC

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Model: A480R2R-1

In Stock (leaves warehouse same day if ordered before 3pm ET)

$3,745.26
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Mersen Amp-Trap Back-Up R-Rated Medium Voltage Fuse, 2R, 4800VAC

The Mersen Amp-Trap Back-Up R-Rated Medium Voltage Fuse is a current-limiting, high-interrupting-rating fuse built for short-circuit protection of medium voltage motors and motor controllers rated 4800VAC. As an R-Rated back-up fuse, it carries a minimum interrupting rating of 65 kA and is intended to be coordinated with overload relays in combination motor starters, with sizing generally specified by the motor starter manufacturer. It is available with 3-inch (size D) or 4-inch (size E) diameter barrels, terminating in ferrule connections and mounting in spring-reinforced clips.

Key Features

  • Design: 2R design detail, R-Rated speed/characteristic for back-up short-circuit protection of medium voltage motor circuits.
  • Rated Voltage: 4800V AC (UL) at 50/60 Hz for medium voltage motor and motor controller applications.
  • Interrupting Rating: 65 kA AC max I.R./breaking capacity for reliable current-limiting performance.
  • Connection/Terminal Type: Ferrule terminals constructed of silver-plated copper for low-resistance, corrosion-resistant connections.
  • Mounting: Mounts in spring-reinforced clips for secure retention in the fuse holder.
  • Visual Indicator: Built-in indication system provides a visual indicator of fuse condition.
  • Body/Insulating Material: Epoxy body construction for dielectric strength and durability.
  • Barrel Sizing: Offered in 3-inch (size D) or 4-inch (size E) diameter barrels to match application requirements.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Indication System: Yes
  • ROHS Compliant: Yes
  • AC or DC: AC
  • Design Details: 2R

Typical Applications

  • Combination Motor Starter Short-Circuit Protection
  • Medium Voltage Motor Circuits
  • Motor Controller Back-Up Fusing
  • Industrial Medium Voltage Electrical Systems

Why Mersen?

Mersen Amp-Trap R-Rated fuses combine a silver-plated copper ferrule connection, epoxy body construction, and a built-in visual indicator to deliver dependable, current-limiting short-circuit protection for medium voltage motor circuits. With a 65 kA interrupting rating and RoHS compliance, this 2R design supports code-compliant, coordinated protection in combination motor starter applications for professional electrical work.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Fuse
Product Material:
Epoxy
Connection Type:
Ferrule
Voltage Rating:
4800V
Standards:
RoHS
Series:
Amp-Trap
Department:
Electrical
Product Group:
Wiring Devices

Mersen A480R2R-1 – Frequently Asked Questions

1) What does R-Rated mean on the Mersen Amp-Trap A480R2R-1 fuse, and can I use it for overload protection?
R-Rated means back-up short-circuit protection only. The Amp-Trap A480R2R-1 is a current-limiting medium voltage fuse built to clear short circuits in motor and motor controller circuits; it is not an overload device. It has to be coordinated with the overload relay in the combination motor starter, and the starter manufacturer generally specifies which R size goes in. If you put one in expecting it to trip on a sustained overload, the relay is what protects the motor, not the fuse.
2) Will a 4800V R-rated motor starter fuse work on a 2400V or 4160V system?
The Amp-Trap A480R2R-1 carries a 4800VAC (UL) rating at 50/60 Hz, which is a maximum voltage rating. Medium voltage fuses can be applied at or below their rated voltage, so a 4160V or 2400V motor circuit is within range, but never above 4800V. For a 7200V or higher class circuit you need a fuse rated for that system voltage instead.
3) Is 65 kA enough interrupting rating for my medium voltage motor controller?
The A480R2R-1 is rated for a minimum 65 kA AC interrupting capacity. Compare that against the available short-circuit current calculated at the line side of your motor controller: the fuse rating has to equal or exceed that figure. On most 4160V industrial services 65 kA is well above the available fault current, and because the fuse is current-limiting it also cuts the let-through energy the starter contactor sees.
4) What size fuse clips do I need for the Mersen 2R Amp-Trap fuse?
It terminates in ferrule connections and mounts in spring-reinforced clips, so the holder has to be the clip-type mounting used in medium voltage starters, not a bolt-in or blade arrangement. The barrel comes in a 3-inch (size D) or a 4-inch (size E) diameter, and the clip set in your starter has to match the barrel size you order.
5) Can I substitute a Class CC or midget fuse for an R-rated medium voltage motor fuse?
No. Low voltage fuses like the Littelfuse CCMR Series Class CC time-delay or the BLF Series midget fast-acting fuse are 250V and 600V class devices for control and branch circuits. They cannot be applied in a 4800VAC medium voltage motor starter under any circumstances. The Amp-Trap R-rated fuse is the class of part for that duty, and the only valid swap is another R-rated medium voltage fuse of the same R number, barrel size, and voltage class.
6) I need fuses for a metering circuit, not a motor starter. Is the Mersen A480R2R-1 the right choice?
No. The Mersen Amp-Trap A480R2R-1 is a back-up R-Rated fuse for short-circuit protection of medium voltage motor circuits and combination motor starters at 4800VAC, and it relies on an overload relay for overload protection rather than protecting a circuit on its own. For metering, the Square D PowerLogic Energy Meter Fuse Pack is a set of three 0.5A 600V fuses intended for energy meter potential circuits.
7) How do I tell if a medium voltage R-rated fuse has blown without pulling it out?
The Amp-Trap 2R fuse has a built-in indication system that gives a visual indicator of fuse condition. On a three-fuse starter that lets a technician spot the opened phase through the cell door or on rack-out without meggering or pulling each barrel. Worth noting for MRO crews standardizing on one fuse across a plant.
8) Do I pick an R-rated fuse by the motor horsepower or by amps?
Neither, directly. R-rated fuses are selected by their R number, and for the Amp-Trap that design detail is 2R. The R number is assigned by the combination motor starter manufacturer for the motor it is controlling, so the correct move on a replacement is to read the R rating off the fuse coming out or off the starter nameplate and match it, along with the barrel length and the voltage class.
9) What is the difference between the Mersen Amp-Trap A480R2R-1 and a Littelfuse BLF midget fuse?
The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body, used for control circuits and small low-voltage loads. The Mersen Amp-Trap A480R2R-1 is an R-Rated medium voltage fuse rated 4800VAC at 50/60 Hz with a 65 kA interrupting rating and an epoxy body, sized by the motor starter manufacturer and coordinated with overload relays. They serve separate voltage classes and are not interchangeable.
10) Is a Littelfuse AGU or AGA5 glass tube fuse an equivalent to the Mersen A480R2R-1?
No. The Littelfuse AGU is an AG-series glass tube fuse and the AGA5 is a 5A glass fuse in the AGA series, both small glass-body automotive and electronics style fuses. The Mersen Amp-Trap A480R2R-1 is a current-limiting R-Rated medium voltage fuse with an epoxy body, silver-plated copper ferrule terminals, a built-in visual condition indicator, and a 4800VAC rating for medium voltage motor controller back-up fusing. There is no overlap in application between the two.
11) What are the fuse body and terminals made of on the Mersen Amp-Trap R-rated fuse?
Body is epoxy, which carries the dielectric strength needed at medium voltage and holds up mechanically in the clips. The ferrules are silver-plated copper for a low-resistance, corrosion-resistant contact, which matters because a high-resistance clip joint on a medium voltage starter runs hot. The fuse is also RoHS compliant if your facility tracks that on procurement.
How fast can I get the Mersen A480R2R-1 delivered?
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Does the Mersen A480R2R-1 come with a warranty?
Absolutely. The Mersen A480R2R-1 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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