Mersen A2D-R Amp-Trap 2000 Cla...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$48.86
Mersen A2D-R Amp-Trap 2000 Class RK1 Time-Delay Fuse

Mersen A2D-R Amp-Trap 2000 Class RK1 Time-Delay Fuse

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Model: A2D40R

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

$48.86
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Mersen A2D-R Amp-Trap 2000 Class RK1 Time-Delay Fuse

The Mersen A2D-R Amp-Trap 2000® is a Class RK1 time-delay fuse rated 250VAC / 250VDC, engineered to deliver IEC Type 2 "no damage" protection to mains, feeders, and branch circuits serving both motor and non-motor loads. Featuring Mersen's SmartSpot® visual indication system, this fuse opens fast under extreme fault conditions for maximum short-circuit protection while still providing the time-delay characteristic needed to ride through motor and transformer inrush current. It is built as a direct upgrade path for facilities still running older 250V Class H, K, or RK5 fuses, combining a rugged PolyTube body with tin-plated copper connection terminals for long-term reliability.

Key Features

  • Fuse Class: Class RK1 construction for reliable, code-compliant short-circuit and overload protection.
  • Time-Delay Characteristic: Speed/characteristic rated Time Delay to withstand motor and transformer inrush current without nuisance opening.
  • Dual Voltage Rating: UL-rated 250V AC and 250V DC for use on both AC and DC circuits.
  • SmartSpot® Indication: Built-in blown-fuse indication system simplifies troubleshooting and reduces downtime.
  • High Interrupting Rating: 200 kA AC maximum interrupt rating / breaking capacity (I1) for demanding fault-current environments.
  • Durable Construction: PolyTube body/insulating material paired with tin-plated copper connection/terminal material for long-term reliability.
  • Mounting: Clip-mount design for straightforward installation into standard fuse clips.
  • Frequency Rating: Rated for 50/60 Hz electrical systems.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Protection of Existing Mains, Feeders, and Branch Circuits
  • Motor and Non-Motor Load Circuit Protection
  • Replacement for Older 250V Class H, K, or RK5 Fuses
  • Industrial and Commercial Electrical Panels
  • Motor Starter and Switch Circuit Protection

Why Mersen?

Mersen's Amp-Trap 2000® A2D-R Class RK1 fuse combines a rugged PolyTube body, tin-plated copper terminals, and a 200 kA interrupt rating with SmartSpot® visual indication for fast fault diagnosis. Built to IEC Type 2 "no damage" performance standards and RoHS compliant, it gives electrical professionals a dependable, code-compliant upgrade path from legacy Class H, K, and RK5 fuses without compromising motor inrush time-delay performance. Choose Mersen for consistent, code-compliant protection across mains, feeders, and branch circuits in demanding industrial and commercial environments.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Type:
Time-Delay Fuse
Series:
Amp-Trap 2000
Product Material:
PolyTube
Voltage Rating:
250VAC/250VDC
Standards:
RoHS Compliant
Connection Type:
Clip-Mount
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Mersen A2D40R – Frequently Asked Questions

1) Can I use a Mersen A2D-R fuse to replace older 250V Class H, K, or RK5 fuses in an existing panel?
Yes, that is exactly what the A2D-R Amp-Trap 2000 is built for. It is a Class RK1 time-delay fuse rated 250VAC/250VDC and Mersen positions it as a direct upgrade path for facilities still running older 250V Class H, K, or RK5 fuses. Because it is Class R dimensionally, it drops into the same clips while the rejection feature means a lower-interrupting Class H fuse cannot be fitted back into an RK1 rejection clip later. You get a 200 kA AC interrupting rating in place of the legacy fuse's much lower capacity.
2) Will a time-delay Class RK1 fuse hold on motor starting inrush without nuisance blowing?
It will. The A2D-R carries a time-delay characteristic specifically so it rides through motor and transformer inrush current rather than opening on it, while still clearing fast under heavy fault conditions. Mersen rates it for IEC Type 2 "no damage" protection of the starter, meaning the contactor and overload relay should survive a short circuit without needing replacement. It is used on mains, feeders, and branch circuits feeding both motor and non-motor loads.
3) What amp ratings and terminal styles does the Mersen A2D-R come in?
Orderable A2D-R configurations include A2D40R at 40A with a standard terminal, A2D45R at 45A in a ferrule style, and A2D150R at 150A with blade terminals. Ferrule and blade matters for fit: smaller Class R ratings use ferrule ends and larger ones use bolt-through or knife blade, so match the terminal style to the clips or lugs in your existing switch.
4) Can a Littelfuse CCMR040 Class CC fuse be used in place of a Mersen A2D-R 40A fuse?
No, they are not interchangeable in the same holder. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC with a clip-mount design that drops into standard Class R fuse clips, and it is offered in a 40A rating (A2D40R). The Littelfuse CCMR040 is a Class CC time-delay fuse, also 40A, but Class CC is a midget-dimension body with its own rejection-style holder, so it will not seat in Class R clips. Both are time-delay, so either will ride through motor inrush, but the holder and class called out on the drawing decides which one belongs in the circuit.
5) Is the Mersen A2D-R rated for DC circuits as well as AC?
Yes. The A2D-R is UL-rated 250V AC and 250V DC, so it can be applied on either, and it is rated for 50/60 Hz systems on the AC side. Note the 200 kA interrupting rating quoted is the AC maximum, so do not assume that figure applies to a DC application.
6) How do I tell whether an A2D-R has blown without pulling it out of the clips?
These fuses include Mersen's SmartSpot visual blown-fuse indication, so a maintenance tech can identify the opened fuse by sight instead of pulling and testing each one in the holder. That is the main troubleshooting advantage over a plain Class R fuse on a multi-pole disconnect.
7) How does the A2D-R mount, and does it need a special holder?
It is a clip-mount fuse that installs into standard fuse clips, so no special holder is required beyond a Class R rated block or switch. Keep in mind a Class RK1 fuse fits an RK5 rejection clip, but an RK5 will not fit RK1-only hardware, so if you are standardizing a facility it is simplest to run RK1 throughout.
8) Should I use a Class RK1 fuse or a Class CC fuse for a motor branch circuit?
It depends on the size of the load and the switch you already have. The Mersen A2D-R is Class RK1 at 250VAC/250VDC and is the right choice for mains, feeders, and larger motor branch circuits in existing Class R fused switches. For small motor and control circuits in compact 600V holders, a Class CC time-delay fuse such as the Littelfuse CCMR040 (CCMR Series, 40A) is the common pick instead, since the two classes are not dimensionally interchangeable.
9) Can I substitute a midget or glass fuse for a Mersen A2D-R?
No. The A2D-R is a Class RK1 clip-mount fuse with a 200 kA AC interrupting rating, intended for mains, feeders, and branch circuits. Parts like the Littelfuse BLF Series midget fast-acting 250V fuse or the Littelfuse AGU and AGA5 glass tube fuses are small-dimension, low-capacity devices for control and equipment protection, and they are neither dimensionally nor electrically equivalent. Replace an A2D-R with another Class R fuse of the same amp rating and terminal style.
10) What is the difference between the Mersen A2D-R and a Littelfuse BLF midget fuse on a 250V circuit?
Both carry a 250V rating, but they behave and mount differently. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC with a PolyTube body, clip-mount terminals, and a 200 kA AC interrupting rating, built for mains, feeders, and branch circuits feeding motor loads where inrush must be tolerated. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body; fast-acting means no intentional time delay, so it is aimed at circuits without a motor inrush pulse. For a motor starter or transformer primary, the time-delay characteristic of the A2D-R is the relevant one.
11) Are Littelfuse AGA or AGU glass fuses an alternative to the Mersen A2D-R?
No. The Littelfuse AGA5 is a 5A glass fuse in the AGA series and the AGU is a glass tube fuse in the AG family; these are small glass-body fuses used for low-current electronic and automotive-style circuits. The Mersen A2D-R is a Class RK1 branch-circuit fuse rated 250VAC/250VDC with a PolyTube body and tin-plated copper terminals, supplied in ratings up to 150A (A2D150R) for mains, feeders, and motor circuits. They serve different parts of a system and are not substitutes for one another.
12) I need fuses for a PowerLogic energy meter, not a motor circuit - is the Mersen A2D-R the right part?
No. For metering, the Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended for the meter voltage inputs. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC, clip-mounted into standard fuse clips, and sized for mains, feeders, and branch circuits in ratings such as 40A and 150A. The 250V rating and the amperage range alone put it outside what a 600V metering input calls for.
13) What is the Mersen A2D-R body made of, and is it RoHS compliant?
The body is a PolyTube insulating material with tin-plated copper connection terminals, which is what holds up in hot industrial panels and resists terminal corrosion in the clips. It is RoHS compliant.
How fast can I get the Mersen A2D40R delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Mersen A2D40R come with a warranty?
Absolutely. The Mersen A2D40R is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Mersen A2D40R?
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