Mersen A2D-R Class RK1 Time-De...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$53.74
Mersen A2D-R Class RK1 Time-Delay Fuse, 250VAC/250VDC

Mersen A2D-R Class RK1 Time-Delay Fuse, 250VAC/250VDC

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Model: A2D50R

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

$53.74
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Mersen A2D-R Class RK1 Time-Delay Fuse, 50A 250VAC/250VDC, SmartSpot Indication

The Mersen A2D-R Class RK1 time-delay fuse delivers reliable overcurrent protection rated 50A at 250VAC/250VDC, combining Class RK1 selectivity with 200 kA breaking capacity for demanding industrial and commercial circuits. Built with tin-plated copper ferrule terminals and a PolyTube insulating body, this Amp-Trap 2000 series fuse adds SmartSpot visual indication so technicians can identify a blown fuse at a glance. RoHS compliant construction supports professional, code-conscious installations.

Key Features

  • 50A Current Rating: Delivers precise overcurrent protection for medium-duty electrical circuits and equipment.
  • Class RK1 Time-Delay: Provides superior selectivity and coordination while tolerating temporary overloads, reducing nuisance tripping in motor and inductive load applications.
  • Dual Voltage Rating 250VAC/250VDC: Versatile construction accommodates both AC and DC applications with consistent protection performance.
  • 200 kA Breaking Capacity: Delivers exceptional fault current interruption for demanding industrial and commercial applications.
  • SmartSpot® Visual Indication: Enables quick visual identification of a blown fuse, reducing troubleshooting time and improving maintenance efficiency.
  • Ferrule Terminal Design: Tin-plated copper terminals with clip mounting ensure reliable connections and corrosion resistance for long-term performance.
  • PolyTube Insulating Body: Durable insulating material supports safe, long-service-life operation.
  • RoHS Compliant Construction: Meets environmental standards while maintaining professional reliability and safety requirements.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

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

Typical Applications

  • Motor Control Centers and Industrial Equipment Protection
  • Commercial HVAC and Lighting Systems
  • Power Distribution Panels and Switchgear
  • Process Control and Automation Equipment
  • Emergency Power and UPS Systems
  • Manufacturing and Production Facilities

Why Mersen?

Mersen A2D-R fuses combine proven Class RK1 time-delay performance with SmartSpot visual indication and RoHS compliant construction. Tin-plated copper ferrule terminals and a PolyTube insulating body help ensure reliable connections and long service life, giving electrical professionals dependable, code-compliant overcurrent protection for critical 250VAC/250VDC circuits.

Manufacturer Resources

Product Specs

Product Type:
Time-Delay Fuse
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses
Connection/Terminal Material:
Tin-Plated Copper
Indication System Type:
SmartSpot®
Indication System:
Yes
Rated voltage DC UL:
250 V
Connection Terminal Type:
Ferrule
Body/Insulating Material:
PolyTube
ROHS Compliant:
Yes
Speed/Characteristic:
Time Delay
Frequency (Hz):
50/60 Hz
AC Max I.R./Breaking Capacity: I1:
200 kA
Rated voltage AC UL:
250 V
AC or DC:
AC/DC
Fuse Class:
Class RK1

Mersen A2D50R – Frequently Asked Questions

1) What amp ratings does the Mersen A2D-R time-delay fuse come in?
Two ratings are offered on the A2D-R: 30A (part A2D30R) and 50A (part A2D50R). Both are Class RK1 time-delay ferrule fuses rated 250VAC/250VDC. Order by the amp rating that matches your circuit and fuse block; the two are not interchangeable in service.
2) Can I use the Mersen A2D-R fuse on a DC circuit as well as AC?
Yes. The A2D-R carries a dual rating of 250VAC and 250VDC, so the same fuse covers AC control and distribution circuits and DC applications such as UPS and emergency power systems up to 250V. Do not apply it above 250V on either supply.
3) Will a Class RK1 time-delay fuse hold up to motor inrush without nuisance blowing?
That is what the time-delay element in the A2D-R is for. It tolerates the temporary overload of motor starting and other inductive loads while still clearing a genuine fault, which is why it is used in motor control centers, HVAC, and process control equipment. A fast-acting fuse in the same circuit would open on inrush.
4) Is the Mersen A2D-R rated for a high available fault current panel?
It has a 200 kA breaking capacity, which covers service entrance and switchgear locations with high available fault current. That interrupting rating is the reason it is specified in power distribution panels and industrial switchgear rather than a general purpose glass fuse.
5) How does the Mersen A2D-R mount, and will it fit my existing fuse clips?
It is a ferrule-style fuse with tin-plated copper end caps and a PolyTube insulating body, so it drops into standard clip-type fuse holders and blocks sized for a Class R fuse of the same amp rating and 250V class. Class R holders are rejection style, so confirm your block is Class R and not a plain cartridge block.
6) What is the difference between the Mersen A2D-R time-delay fuse and the Littelfuse CCMR040?
Both are time-delay fuses suited to motor and inductive loads, but they are different physical classes and are not interchangeable in a fuse holder. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC with 200 kA breaking capacity, offered in 30A and 50A, and it uses ferrule terminals with clip mounting. The Littelfuse CCMR040 is a CCMR series Class CC time-delay fuse at 40A. Class CC bodies are the smaller midget footprint with a rejection feature, so a Class CC holder will not accept an RK1 ferrule fuse and an RK1 block will not retain a Class CC fuse. Choose by the block already in the panel.
7) Can I use a Littelfuse BLF midget fuse in place of a Mersen A2D-R?
No, they protect differently and mount differently. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC that rides through motor inrush and temporary overloads without nuisance opening. The Littelfuse BLF is a midget fast-acting fuse rated 250V with a laminated tube body; a fast-acting element is intended for non-inductive circuits such as control and electronic loads and will open on the starting current of a motor. The midget body is also physically smaller than an RK1 ferrule fuse, so it will not seat in an RK1 block. Use the BLF for control circuits and the A2D-R where motor or transformer inrush is present.
8) How do I tell if a Mersen A2D-R fuse has blown without pulling it and testing it?
The A2D-R carries Mersen's SmartSpot visual indicator. When the element opens, the indicator shows it, so a technician can walk a fuse block and spot the failed fuse instead of ringing out each one. That is a real time saver in a multi-fuse motor control center.
9) Can I substitute a glass tube fuse for the Mersen A2D-R in an industrial panel?
No. Glass tube fuses such as the Littelfuse AGA and AGU series are low interrupting-rating fuses for light-duty and automotive/appliance style circuits. The A2D-R is a Class RK1 branch circuit fuse with 200 kA breaking capacity for industrial distribution. Swapping a glass fuse into that duty leaves the circuit without adequate fault interruption.
10) Is a Littelfuse AGA or AGU glass fuse an alternative to the Mersen A2D-R?
They serve different circuits. The Littelfuse AGA series, such as the AGA5 at 5A, and the AGU series are small glass tube fuses used for low-current automotive, audio and appliance wiring. The Mersen A2D-R is a Class RK1 industrial branch-circuit fuse rated 250VAC/250VDC with 200 kA breaking capacity and SmartSpot visual blown-fuse indication, offered at 30A and 50A for motor control centers, distribution panels and HVAC circuits. If you are fusing a feeder or a motor circuit in a panel, the A2D-R is the correct family; glass tube fuses are not rated for that service.
11) Is the Mersen A2D-R fuse RoHS compliant for a spec-driven job?
Yes, the A2D-R is built to RoHS compliant construction, which is what most institutional and government electrical specs ask for on wiring device submittals.
12) Will a Square D PowerLogic meter fuse pack work for the same circuits as the Mersen A2D-R?
No. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended to protect the voltage-sensing leads of a PowerLogic energy meter. The Mersen A2D-R is a Class RK1 time-delay branch-circuit and feeder fuse rated 250VAC/250VDC in 30A and 50A, with 200 kA breaking capacity for motor control centers and distribution panels. If you are replacing metering potential fuses, the PowerLogic pack is the right item; if you are protecting a load circuit, use the A2D-R at the required amperage.
How fast can I get the Mersen A2D50R 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 A2D50R come with a warranty?
Absolutely. The Mersen A2D50R 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 A2D50R?
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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