Mersen D0R0 Series Amp-Trap® E...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,031.94
Mersen D0R0 Series Amp-Trap® E-Rated Medium Voltage Fuse, Ferrule Terminal

Mersen D0R0 Series Amp-Trap® E-Rated Medium Voltage Fuse, Ferrule Terminal

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Model: A055F1D0R0-150E

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

$2,031.94
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Mersen D0R0 Series Amp-Trap® E-Rated Medium Voltage Fuse, Ferrule Terminal

The Mersen D0R0 Series Amp-Trap® is a medium voltage, current-limiting fuse engineered to protect transformers and distribution lines from overload and short-circuit conditions. This E-Rated fuse is designed to withstand transformer magnetizing inrush current while opening at levels as low as 1.7 times its ampere rating up to its maximum interrupting rating. Built with a Ferrule connection/terminal type and Silver-Plated Copper terminals, this unit is rated 5500V AC UL, 150A, with a 63 kA AC max interrupting rating, and mounts in spring-reinforced clips. The family is available with 2" (size C), 3" (size D), and 2x3" (size DD) diameter PolyTube barrels for a range of medium voltage protection applications.

Key Features

  • Current-Limiting Protection: Amp-Trap® design melts at current as low as 1.7 times the fuse ampere rating up to its maximum interrupting rating, safeguarding transformers and distribution lines.
  • E-Rated Speed/Characteristic: Engineered to withstand transformer magnetizing inrush current without nuisance operation.
  • Ferrule Connection/Terminal Type: Silver-Plated Copper terminal material delivers a low-resistance, durable connection.
  • Visual Indicator System: Built-in indication system provides at-a-glance confirmation of fuse status.
  • Ampere Rating: 150A for reliable overcurrent protection in medium voltage circuits.
  • Rated Voltage: 5500 V AC UL at 50/60 Hz, with an AC Max Interrupting/Breaking Capacity (I1) of 63 kA.
  • Clip Mounting: Mounts in spring-reinforced clips for a secure, vibration-resistant fit.
  • PolyTube Body/Insulating Material: Barrel construction supports 2" (size C), 3" (size D), and 2x3" (size DD) diameter configurations.

Technical Specifications

  • AC or DC: AC
  • Indication System: Yes
  • Connection/Terminal Type: Ferrule
  • Connection/Terminal Material: Silver-Plated Copper
  • Mounting: Clip
  • AC Max I.R./Breaking Capacity (I1): 63 kA
  • Ampere Rating: 150 A
  • Frequency: 50/60 Hz
  • Speed/Characteristic: E-Rated
  • Rated Voltage AC UL: 5500 V
  • Body/Insulating Material: PolyTube

Typical Applications

  • Transformer Overload and Short-Circuit Protection
  • Medium Voltage Distribution Line Protection
  • Utility and Industrial Power Distribution Systems
  • Medium Voltage Switchgear and Fuse Clip Assemblies
  • Applications Requiring E-Rated, Current-Limiting Fuse Protection

Why Mersen?

Mersen's Amp-Trap® D0R0 Series combines current-limiting performance with Silver-Plated Copper Ferrule terminals, a built-in Visual Indicator, and a 63 kA AC max interrupting rating to deliver dependable protection for transformers and distribution lines. The spring-reinforced clip mounting and PolyTube body construction support consistent, code-compliant performance in demanding medium voltage electrical systems.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Fuse
Product Material:
PolyTube
Connection Type:
Ferrule
Voltage Rating:
5500V
Amperage Rating:
150A
Series:
D0R0
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses
Product Length:
15.88 in
Product Width:
3 in
Product Weight:
10 lb

Mersen A055F1D0R0-150E – Frequently Asked Questions

1) Will the Mersen D0R0 150E fuse work on a 4160V transformer circuit?
The D0R0 Series Amp-Trap is rated 5500V AC UL at 50/60 Hz, so it covers medium voltage systems up to that rating, including common 4160V distribution. It is an AC-only fuse, rated 150A with a 63 kA AC maximum interrupting capacity. Do not apply it on DC circuits.
2) What does the E rating mean on a medium voltage transformer fuse, and why does it matter?
E-Rated means the fuse is built to ride through transformer magnetizing inrush without nuisance opening, while still melting at current as low as 1.7 times its ampere rating up to its maximum interrupting rating. On the Mersen D0R0 at 150A, that gives you overload and short-circuit protection on the transformer primary without tripping every time the transformer energizes.
3) How does the Mersen D0R0 fuse mount - does it need a bolted connection?
No bolting. The D0R0 uses ferrule terminals in silver-plated copper and drops into spring-reinforced fuse clips, so it is a clip-mounted fuse for switchgear and fuse clip assemblies. If your gear is prepped for bolt-on blade terminals, this is not the right terminal style.
4) Is a Mersen D0R0 medium voltage fuse the same thing as a Class CC or midget fuse?
No, and they are not substitutable. The D0R0 is a 5500V medium voltage current-limiting fuse for transformer primaries and distribution lines. Low voltage branch and control circuit protection uses a different family entirely, such as the Littelfuse CCMR Series Class CC time-delay fuse in 40A, or the Littelfuse BLF Series midget fast-acting fuse rated 250V. Never put a low voltage fuse in a medium voltage holder.
5) I need to protect a transformer primary against both overload and bolted faults - is one fuse enough?
The D0R0 Amp-Trap is current-limiting and handles both ends of the range on a medium voltage transformer primary: it opens on sustained overload down at 1.7 times its 150A rating, and interrupts short-circuit current up to 63 kA AC. Confirm your available fault current at that point in the system is at or below 63 kA and that your system voltage does not exceed 5500V.
6) Can a Littelfuse CCMR Class CC time-delay fuse be used in place of the Mersen A055F1D0R0-150E?
No. The Mersen A055F1D0R0-150E is a 5500V, 150A E-Rated medium voltage ferrule fuse that mounts in spring-reinforced clips for transformer and distribution line protection. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A, a branch-circuit control fuse for low voltage motor and control circuits. The two are different voltage classes and different mounting systems, so one cannot stand in for the other.
7) Is a Littelfuse BLF midget fuse an alternative to the Mersen D0R0 150A fuse?
They serve different systems. The Littelfuse BLF Series is a midget fast-acting fuse rated 250V with a laminated tube body. The Mersen A055F1D0R0-150E is a 5500V AC medium voltage current-limiting fuse with a PolyTube barrel and silver-plated copper ferrule terminals, built to withstand transformer magnetizing inrush without nuisance operation. Use the BLF for 250V control and branch applications and the D0R0 where a medium voltage E-Rated fuse is specified.
8) Which barrel size do I get on the Mersen D0R0 Amp-Trap fuse?
The D0R0 family uses PolyTube barrels in 2 inch (size C), 3 inch (size D), and 2x3 inch (size DD) diameters. The orderable part here is A055F1D0R0-150E, the 150A 5500V ferrule version. Check the clip spacing and barrel diameter in your existing holder before ordering, since the sizes are not interchangeable in a given clip set.
9) Can I tell whether this Mersen fuse has blown without pulling it out of the clips?
Yes. The D0R0 Amp-Trap carries a built-in visual indicator, so a technician can confirm fuse status at a glance during a switchgear inspection rather than de-energizing and removing each element to test it. That matters on MRO rounds where the gear is in a locked medium voltage enclosure.
10) I need a smaller inline glass fuse for a metering or control circuit, not a medium voltage fuse. What should I look at instead of the Mersen D0R0?
For small inline glass-tube protection, the Littelfuse AGA Series 5A glass fuse and the Littelfuse AGU Series AG glass tube fuse are the glass-body options to consider, and the Square D PowerLogic energy meter fuse pack covers metering at 0.5A 600V in a set of three. The Mersen A055F1D0R0-150E is a 150A fuse rated 5500V AC for transformer and distribution line protection, a much larger medium voltage device.
11) What is the body made of on the Mersen D0R0 fuse, and does it hold up in switchgear?
The barrel is PolyTube, with silver-plated copper ferrules at each end for a low-resistance connection. The spring-reinforced clip mounting keeps it seated against vibration in utility and industrial distribution gear.
How fast can I get the Mersen A055F1D0R0-150E delivered?
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Can I return it if it doesn’t work for me?
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Does the Mersen A055F1D0R0-150E come with a warranty?
Absolutely. The Mersen A055F1D0R0-150E 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 A055F1D0R0-150E?
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