Mersen A6D Class RK1 Time-Dela...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$56.93
Mersen A6D Class RK1 Time-Delay Fuse, 600VAC/600VDC, SmartSpot

Mersen A6D Class RK1 Time-Delay Fuse, 600VAC/600VDC, SmartSpot

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Model: A6D30R

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

$56.93
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Mersen A6D30R Class RK1 Time-Delay Fuse, 30A, SmartSpot Indication System

The Mersen A6D30R Class RK1 Time-Delay Fuse delivers dependable overcurrent protection for demanding commercial and industrial electrical systems. Rated 30A at 600VAC/600VDC, this professional-grade fuse combines Class RK1 current-limiting performance with a 200kA breaking capacity to reduce let-through energy and safeguard sensitive downstream equipment. The SmartSpot indication system provides quick visual confirmation of fuse status without removal or testing, while the PolyTube insulating body and tin-plated copper ferrule terminals ensure secure, corrosion-resistant connections for long-term field reliability.

Key Features

  • Amperage Rating: 30A current rating provides precise overcurrent protection for medium-duty electrical circuits and equipment.
  • Dual Voltage Rating: Rated 600VAC/600VDC for versatile protection across both AC and DC applications in commercial and industrial systems.
  • Class RK1 Performance: Superior current-limiting characteristics reduce let-through energy and protect downstream equipment from fault damage.
  • SmartSpot Indication System: Visual indication technology allows quick identification of blown fuses without removal or testing, speeding troubleshooting.
  • 200kA Breaking Capacity: High interrupting rating handles severe fault conditions while maintaining overall system integrity.
  • Time-Delay Characteristic: Allows temporary overloads while still providing fast protection against short circuits and sustained overcurrent conditions.
  • Durable Construction: PolyTube body insulating material provides excellent insulation properties for safe, reliable operation.
  • Ferrule Terminal Design: Tin-plated copper terminals with secure clip mounting ensure reliable connections and straightforward installation.

Technical Specifications

  • Indication System: Yes
  • Indication System Type: SmartSpot®

Typical Applications

  • Motor Control Centers and Industrial Equipment Protection
  • Commercial HVAC Systems and Building Services
  • Power Distribution Panels and Switchgear
  • Manufacturing Equipment and Process Control
  • Data Centers and Critical Infrastructure
  • Renewable Energy Systems and Battery Storage

Why Mersen?

Mersen fuses deliver proven reliability through advanced SmartSpot indication technology and robust PolyTube construction. The Class RK1 rating and 200kA breaking capacity provide superior protection performance, while the time-delay characteristic supports optimal coordination in complex electrical distribution systems. Tin-plated copper ferrule terminals and secure clip mounting deliver long-term durability for professional electrical installations.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Group:
Circuit Protection
Product Finish:
Tin-Plated Copper
Product Type:
Time-Delay Fuse
Voltage Rating:
600VAC/600VDC
Product Material:
PolyTube
Department:
Electrical
Product Subgroup:
Fuses

Mersen A6D30R – Frequently Asked Questions

1) What amperage ratings does the Mersen A6D Class RK1 fuse come in?
Two ratings are offered: 30A (A6D30R) and 300A (A6D300R). Both are Class RK1 time-delay fuses rated 600VAC/600VDC. Pick the amperage to match the circuit or motor overload you are protecting, and order by the full part number so you get the right one.
2) Can I use the Mersen A6D fuse on a DC circuit, like battery storage or solar?
Yes. The A6D carries a dual rating of 600VAC and 600VDC, so it can be applied on either AC or DC systems up to 600 volts. The description calls out renewable energy systems and battery storage among its typical applications.
3) Will a time-delay RK1 fuse hold through motor starting inrush?
That is what the time-delay characteristic is for. The A6D tolerates temporary overloads such as motor starting current while still clearing short circuits and sustained overcurrent fast. It is listed for motor control centers, commercial HVAC, and manufacturing equipment. If you need a fast-acting fuse instead for non-inductive loads, that is a different curve entirely.
4) What interrupting rating does the Mersen A6D have, and why does it matter for my panel?
200kA breaking capacity. Class RK1 current-limiting action cuts let-through energy during a fault, which is what protects downstream equipment and supports the available fault current at your service. On high-fault-current services that 200kA number is the one the engineer checks first.
5) What is the difference between the Mersen A6D and the Littelfuse CCMR040 Class CC time-delay fuse?
Both are time-delay fuses, but they are different fuse classes and are not interchangeable in the same holder. The Mersen A6D is a Class RK1 time-delay fuse rated 600VAC/600VDC with ferrule terminals and the SmartSpot indication system, offered in 30A and 300A. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Class CC fuses use a rejection-style midget body and require a Class CC holder, while an RK1 fuse drops into R-class clips, so pick the one that matches the block already in the panel.
6) Can I use a Littelfuse BLF midget fuse in place of a Mersen A6D?
No. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body, so it neither matches the 600VAC/600VDC rating of the Mersen A6D nor its time-delay curve. A fast-acting midget will open on motor inrush where the A6D time-delay characteristic is designed to ride through temporary overloads, and the physical body is a different size than a Class RK1 ferrule fuse. Use the BLF only where a 250V fast-acting midget is what the circuit calls for.
7) Which fuse should I choose for a motor circuit that trips on startup inrush?
A time-delay fuse is the right family. The Mersen A6D is a Class RK1 time-delay fuse rated 600VAC/600VDC with 200kA interrupting capacity, built to allow temporary overloads such as motor starting while still clearing short circuits quickly, and it carries SmartSpot visual indication so a blown element can be spotted without pulling the fuse. If the equipment uses a Class CC rejection holder instead of R-class clips, the Littelfuse CCMR040 is a Class CC time-delay fuse at 40A. Match the class to the holder first, then the ampere rating to the load.
8) How do I tell if a Mersen A6D fuse is blown without pulling it out of the clips?
The A6D uses Mersen's SmartSpot indication system, a visual indicator that shows fuse status so a tech can spot an open fuse without removing it or metering it. That saves real time in a crowded panel or motor control center during a troubleshooting call.
9) Can I substitute a glass tube or midget fuse where an A6D RK1 is specified?
No. Peers like the Littelfuse AGA and AGU glass tube fuses, or the BLF midget fast-acting fuse rated 250V, are low-voltage, low-current devices for electronics and accessory circuits. They do not have the 600V rating, the RK1 current-limiting class, or the 200kA interrupting capability the A6D brings to a 600V distribution or motor circuit.
10) Is a Littelfuse AGA or AGU glass fuse an alternative to the Mersen A6D?
They serve different circuits. The Littelfuse AGA5 is a 5A glass fuse in the AGA series and the AGU is an AG-series glass tube fuse, both small glass-bodied fuses typical of low-current control, automotive, and appliance circuits. The Mersen A6D is a Class RK1 time-delay fuse with a PolyTube insulating body, tin-plated copper ferrules, and a 600VAC/600VDC rating intended for motor control centers, distribution panels, and switchgear. For branch and feeder protection at 600V, the A6D is the applicable part; the glass fuses are not rated for that duty.
11) My meter needs fuses - can I order the Mersen A6D for that, or is there a dedicated part?
For metering, the dedicated part is the Square D PowerLogic Energy Meter Fuse Pack, a set of three 0.5A 600V fuses sized for energy meter voltage inputs. The Mersen A6D is a Class RK1 time-delay fuse supplied in 30A and 300A ratings for feeder, motor, and equipment protection, so its lowest rating is far above what a meter potential circuit wants. Use the PowerLogic pack on the meter and the A6D on the power circuit it is monitoring.
How fast can I get the Mersen A6D30R delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 A6D30R come with a warranty?
Absolutely. The Mersen A6D30R 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 A6D30R?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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