Mersen A6D_R Series Class RK1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$56.93
Mersen A6D_R Series Class RK1 Time-Delay Fuse, 600VAC/600VDC

Mersen A6D_R Series Class RK1 Time-Delay Fuse, 600VAC/600VDC

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Model: A6D20R

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

$56.93
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Mersen A6D_R Series Class RK1 Time-Delay Fuse, 600VAC/600VDC

The Mersen A6D_R Series Class RK1 Time-Delay Fuse delivers reliable overcurrent protection for demanding industrial and commercial power distribution systems. Rated for 600VAC/600VDC dual-voltage service, this blade-terminal fuse combines current-limiting Class RK1 performance with the SmartSpot indication system for immediate visual confirmation of fuse status. Built with a durable PolyTube body and tin-plated copper terminals, and manufactured to RoHS compliant construction standards, the A6D_R Series is engineered for dependable protection of motors, transformers, and distribution equipment.

Key Features

  • Class RK1 Performance: Current-limiting characteristics provide enhanced equipment protection and reduced arc flash hazards.
  • 600VAC/600VDC Dual Voltage: Versatile voltage compatibility supports both AC and DC applications in industrial and commercial environments.
  • Time-Delay Characteristics: Allows temporary overloads while providing fast response to fault conditions, ideal for motor and transformer applications.
  • SmartSpot Indication System: Visual fault indication eliminates guesswork during troubleshooting and maintenance procedures.
  • Blade Terminal Design: Secure clip mounting with tin-plated copper terminals provides reliable connections and easy replacement.
  • Durable PolyTube Construction: Insulating body material supports long-term performance in demanding electrical environments.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Indication System: SmartSpot®
  • RoHS Compliant: Yes
  • Fuse Class: Class RK1
  • Rated Voltage AC: 600 V
  • Rated Voltage DC: 600 V
  • Speed Characteristic: Time Delay
  • Body Insulating Material: PolyTube
  • Connection Terminal Material: Tin-Plated Copper
  • Connection Terminal Type: Blade
  • Mounting Method: Clip

Typical Applications

  • Industrial Motor Control Centers and Variable Frequency Drives
  • Commercial HVAC Systems and Large Equipment Protection
  • Power Distribution Panels and Switchgear Applications
  • Manufacturing Facilities and Process Control Systems
  • Data Centers and Critical Infrastructure Protection
  • Renewable Energy Systems and Battery Storage Applications

Why Mersen?

Mersen fuses deliver proven reliability with RoHS compliant construction and advanced SmartSpot indication technology. The robust PolyTube body material and precision tin-plated copper terminals ensure long-term performance in demanding electrical environments, giving specifiers a Class RK1 time-delay solution built for code-compliant, dual-voltage protection across the A6D_R Series.

Manufacturer Resources

Product Specs

Product Type:
Fuse
Series:
A6D_R
Voltage Rating:
600V
Connection Type:
Blade
Product Finish:
Tin-Plated Copper
Standards:
RoHS Compliant
Product Material:
PolyTube
Department:
Electrical
Product Group:
Wiring Devices

Mersen A6D20R – Frequently Asked Questions

1) Will a Mersen A6D_R fuse fit my existing Class RK1 or Class RK5 fuse block?
The A6D_R Series is a Class R fuse with blade terminals that mounts in clips, so it drops into an R-rated fuse block or rejection-style switch built for Class R. Class RK1 will also seat in a block or holder that accepts Class RK5 of the same amp rating and voltage, since the case dimensions are common to Class R. The reverse is not true: an RK5 fuse will not seat in a Class RK1 rejection block. Match the amp rating too, because Class R case sizes step at 30A, 60A, 100A, 200A, 400A and 600A.
2) Can I use a Mersen A6D200R on a 480V motor circuit, or do I need a 480V-rated fuse?
A 600V fuse covers a 480V circuit. The A6D_R Series is rated 600VAC and 600VDC, and a fuse may always be applied at or below its voltage rating, never above. That dual rating is the useful part: the same A6D200R works on a 480V three-phase motor feeder and on a DC bus up to 600V, which is why it shows up in drive and battery storage work as well as standard AC distribution.
3) Why does a motor keep blowing fast-acting fuses, and will a time-delay fuse like the A6D_R fix it?
Motor inrush is the usual culprit. A motor draws several times full-load current for the first seconds of start, and a fast-acting fuse sees that as a fault. The A6D_R Series is a time-delay fuse, so it rides through those temporary overloads while still clearing a real short circuit quickly. Same story on transformer magnetizing inrush. If the circuit has no inrush at all, a fast-acting fuse is the better protection, which is what a midget fast-acting type like the Littelfuse BLF Series is for.
4) What is the closest time-delay alternative to a Mersen A6D_R fuse for a smaller motor circuit?
The Mersen A6D_R Series is a Class RK1 time-delay fuse rated 600VAC/600VDC with blade terminals and clip mounting, built in amperages including 20A, 25A and 200A. When the holder is a Class CC block rather than an RK1 clip, the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Both share the time-delay characteristic that rides through motor inrush, but they are different fuse classes with different bodies and mountings, so the fuse block and rejection features decide which one belongs in the opening.
5) Can a midget fuse be used in place of a Mersen A6D_R Class RK1 fuse?
No. The Mersen A6D_R Series is a Class RK1 time-delay fuse rated 600VAC and 600VDC with blade terminals in a PolyTube body. The Littelfuse BLF Series is a midget fast-acting fuse rated 250V in a laminated tube. The voltage rating and the speed characteristic both differ, and the midget body will not seat in an RK1 fuse clip, so the BLF is a different device rather than a drop-in for an A6D_R.
6) What amp ratings does the Mersen A6D_R time-delay fuse come in?
Three ratings: 20A (A6D20R), 25A (A6D25R) and 200A (A6D200R). Order by amperage, since the part number carries it. For a motor branch circuit, size against the motor nameplate full-load amps and the overload relay rather than the wire alone, because a time-delay Class RK1 is normally sized above FLA to allow starting current.
7) How do I tell which fuse is blown in a panel without pulling every one?
The A6D_R Series carries Mersen's SmartSpot indicator, a visual marker on the fuse body that shows when the element has opened. You read the panel instead of pulling and testing each fuse, which is the difference between a five-minute call and an hour on a switchboard. It is still worth confirming with a meter before you re-energize.
8) Is a Class RK1 fuse worth it over Class RK5 for arc flash?
Class RK1 is the current-limiting choice of the two. It clears a high fault faster and lets through less energy, which lowers incident energy at the equipment and is why RK1 gets specified where an arc flash study drives the design. RK5 fits the same block but does not limit current as tightly. The A6D_R Series is Class RK1 with time-delay characteristics, so you get the current-limiting behaviour without giving up motor-start tolerance.
9) I need a 40A time-delay fuse but the A6D_R only goes 20A, 25A and 200A. What else is there?
For a 40A time-delay in a smaller footprint, the Littelfuse CCMR040 is a Class CC time-delay fuse at 40A. Class CC is a different case and a different holder than Class R, so it is not a swap into an existing R block: it is the choice when you are building or replacing the holder too. If the holder has to stay Class R, stay in the A6D_R Series and pick the rating the circuit actually needs.
10) Can I replace a glass automotive-style fuse with a Mersen A6D_R?
No. The A6D_R Series is a 600V Class R blade fuse for industrial power distribution and it will not fit a glass-tube holder. Glass tube types like the Littelfuse AGA or AGU Series are small low-voltage cartridge fuses for equipment and accessory circuits, a completely different form factor and duty. Match the class and the holder, not just the amp rating.
11) What fuse should be used to protect a 600V metering circuit instead of a Mersen A6D_R?
Metering taps are fused far below what an A6D_R covers. The Mersen A6D_R Series is a 600VAC/600VDC Class RK1 time-delay fuse built in amperages such as 20A and 25A for motor, transformer and distribution loads. For the voltage tap into an energy meter, the Square D PowerLogic Energy Meter Fuse Pack is a set of three 0.5A 600V fuses. Both are rated for 600V service, but the 0.5A meter pack protects an instrument tap while the A6D_R protects the power circuit itself.
12) Is the Mersen A6D_R fuse RoHS compliant for a spec that requires it?
Yes, the A6D_R Series is built to RoHS compliant construction. That is the compliance statement carried on the series, and it is the one to cite on a submittal that calls for RoHS.
13) What are the terminals and body made of on the A6D_R, and will they hold up in a hot switchgear room?
Tin-plated copper blades and a PolyTube insulating body. The tin plating on copper resists oxidation at the clip contact, which is where fuse connections usually go wrong: a corroded or loose clip runs hot and nuisance-opens the fuse. The PolyTube body handles the thermal load in a distribution or motor control enclosure. Clean or replace worn clips when you change fuses, since even good terminals cannot fix a tired clip.
14) Which fuse is the fast-acting counterpart when a time-delay Mersen A6D_R is not wanted?
The Mersen A6D_R Series carries a time-delay speed characteristic, which lets it ride through the temporary overload of a motor or transformer inrush. Where a circuit calls for a fast-acting element instead, the Littelfuse BLF Series is a fast-acting midget fuse rated 250V. The two differ in speed characteristic, voltage rating and body style, so the choice follows the load and the holder already in the panel.
How fast can I get the Mersen A6D20R 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 A6D20R come with a warranty?
Absolutely. The Mersen A6D20R 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 A6D20R?
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