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Mersen Class RK1 Time-Delay Fuse with SmartSpot Indication, 600VAC/600VDC
Model: MER-A6D
Mersen Class RK1 Time-Delay Fuse with SmartSpot Indication, 600VAC/600VDCThe Mersen Class RK1 Time-Delay Fuse with SmartSpot Indication delivers dependable overcurrent protection for commercial and...
Mersen
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$56.93
Mersen A2D-R Class RK1 Time-Delay Fuse with SmartSpot Indication
The Mersen A2D-R is a Class RK1 time-delay fuse family rated 250VAC/250VDC, part of Mersen's Amp-Trap 2000 series and engineered for reliable overcurrent protection in demanding electrical systems. Each fuse features SmartSpot® visual indication for fast identification of a blown fuse, a 200 kA breaking capacity for severe fault conditions, and tin-plated copper blade terminals for secure clip-mount connections. The time-delay characteristic allows temporary overloads while protecting against sustained overcurrent conditions, making this family well suited to motor and other inductive-load applications across commercial and industrial systems.
Key Features
- Fuse Class: Class RK1 performance delivers superior current-limiting characteristics and reduced let-through energy.
- Speed Characteristic: Time-Delay design allows temporary overloads while protecting against sustained overcurrent, ideal for motor and inductive-load applications.
- Dual Voltage Rating: Rated 250VAC/250VDC for versatile AC and DC application compatibility with consistent protection performance.
- Breaking Capacity: 200 kA AC maximum breaking capacity ensures reliable fault-current interruption under severe conditions.
- Indication System: SmartSpot® visual indication provides immediate confirmation of fuse status for faster maintenance.
- Connection Terminal: Blade-type, tin-plated copper terminals with clip mounting provide secure connections and easy installation.
- Body Material: PolyTube insulating material supports durable, long-term construction.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- Fuse Class: RK1
- Voltage Rating: 250VAC/250VDC
- Breaking Capacity: 200 kA
- Indication System Type: SmartSpot®
- RoHS Compliant: Yes
Typical Applications
- Motor Control Centers and Industrial Equipment Protection
- Commercial HVAC Systems and Building Services
- Power Distribution Panels and Switchgear
- Manufacturing and Process Control Equipment
- Renewable Energy and Battery Storage Systems
- Critical Infrastructure and Data Centers
Why Mersen?
Mersen A2D-R Class RK1 fuses combine proven current-limiting technology with SmartSpot® visual indication for enhanced system reliability and faster maintenance. The PolyTube insulating material and tin-plated copper blade terminals support long-term performance, while RoHS compliance reflects a commitment to environmental responsibility. Choose Mersen for code-compliant overcurrent protection in critical electrical systems.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Product Type:
- Time-Delay Fuse
- Product Material:
- PolyTube
- Product Finish:
- Tin-Plated Copper
- Voltage Rating:
- 250VAC/250VDC
- Series:
- Amp-Trap 2000
- Standards:
- RoHS Compliant
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuses
Mersen A2D15R – Frequently Asked Questions
1) Can I use a Mersen A2D-R fuse to replace a Class RK5 fuse in the same fuse block?
Yes. The A2D-R is a Class RK1 time-delay fuse in the rejection (R) style, so it uses the same dimensions and clip mounting as Class RK5 and standard Class H/K fuses of the same amp rating and 250V class. Going from RK5 to RK1 gets you better current limiting and lower let-through energy. The one direction that does not work is the reverse: once a holder has rejection clips, only R-style fuses like the A2D-R will seat in it.
2) Will a time-delay RK1 fuse hold in on motor inrush, or will it nuisance-blow?
The time-delay characteristic is exactly what handles motor starting. It rides through the temporary inrush of an inductive load while still clearing sustained overcurrent, which is why this family is aimed at motor control centers, commercial HVAC, and process equipment. If you are protecting a purely resistive or electronic load with no inrush, a fast-acting fuse is the better fit.
3) Is the Mersen A2D-R rated for DC circuits like battery storage?
It carries a dual rating of 250VAC/250VDC, so it can be applied on either AC or DC up to 250 volts. Battery storage and renewable energy systems are named among the typical uses. Do not apply it above 250V on either side.
4) What is the difference between the Mersen A2D-R and a Class CC time-delay fuse like the Littelfuse CCMR040?
Both are time-delay fuses suited to motor and inductive loads, but they are different fuse classes and are not interchangeable in the same holder. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC with blade-type tin-plated copper terminals for clip mounting. The Littelfuse CCMR040 is a Class CC time-delay fuse in the CCMR series rated 40A, which uses the much smaller midget-style CC body and rejection-style CC holders. Choose by the class the panel or fuse block is built for: an RK1 clip base takes the A2D-R, while a Class CC block takes the CCMR.
5) Can a Littelfuse BLF midget fuse be used in place of a Mersen A2D-R?
No. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body, so it is both a different physical size and a different speed characteristic. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC with blade-type tin-plated copper terminals that clip into an RK-size fuse base, and its time-delay curve is what lets motor inrush pass without nuisance opening. A fast-acting midget fuse on a motor circuit will open on starting current, and it will not mount in an RK1 clip. Use the BLF only where a midget fast-acting fuse is specified, such as control circuits.
6) What amp ratings does the Mersen A2D-R come in?
Three ratings are offered: 10A (A2D10R), 15A (A2D15R), and 100A (A2D100R). Order by the full catalog number, since the R suffix is what identifies the rejection-style Class RK1 body.
7) How do I tell if an A2D-R fuse is blown without pulling it out of the clips?
Each fuse carries Mersen's SmartSpot visual indicator, so a maintenance tech can read fuse status at a glance instead of pulling and testing every leg. For an MRO crew troubleshooting a three-fuse motor circuit, that is the difference between a minute and a service call.
8) Is 200 kA interrupting rating enough for a panel fed by a large service transformer?
The A2D-R is rated for a 200 kA AC maximum breaking capacity, which is the top tier commonly specified for industrial switchgear and distribution panels and covers available fault current at essentially any commercial or industrial service. As a current-limiting Class RK1, it also cuts let-through energy to downstream gear.
9) Should I use a Class RK1 fuse or a Class CC fuse for a motor branch circuit?
It depends on the holder and the amp range. The Mersen A2D-R is a 250V Class RK1 time-delay fuse on blade terminals with clip mounting, suited to larger motor and feeder protection in standard R-style fuse blocks. For small control circuits and compact starters, a Class CC time-delay fuse such as the Littelfuse CCMR040 in the CCMR series is the ferrule-style alternative. The two classes are not interchangeable in the same holder.
10) For a small control or electronics circuit, is there a simpler alternative to the Mersen A2D-R?
Yes, for low-current circuits a glass tube fuse is the common choice rather than a full RK1 blade fuse. The Littelfuse AGA5 is a 5A glass fuse in the AGA series, and the Littelfuse AGU series is an AG glass tube fuse supplied boxed. These are small cylindrical ferrule fuses that drop into clip or panel-mount holders. The Mersen A2D-R is built for branch and feeder protection instead: Class RK1, 250VAC/250VDC, 200 kA breaking capacity, offered in 10A, 15A and 100A ratings with blade terminals. Use the glass fuses for low-energy circuits and the A2D-R where high available fault current has to be interrupted.
11) We need fuses for a PowerLogic energy meter - will the Mersen A2D-R work?
No. Metering potential circuits use a very small, high-voltage-rated fuse, and Square D supplies the PowerLogic energy meter fuse pack as a set of three rated 0.5A at 600V for exactly that duty. The Mersen A2D-R is a 250VAC/250VDC Class RK1 time-delay power fuse with blade terminals, intended for motor circuits, power distribution panels and switchgear rather than meter voltage inputs, and its lowest rating is 10A. Order the meter fuse pack for the metering leads and reserve the A2D-R for the load side of the distribution equipment.
12) Which time-delay fuse gives visual indication that it has opened?
The Mersen A2D-R carries SmartSpot visual indication, so a technician can confirm a blown fuse at a glance without pulling and testing it, and it is part of the Amp-Trap 2000 series with a 200 kA breaking capacity. Among the other time-delay options, the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A in a midget CC body. If fast fault identification in a motor control center matters to your maintenance crew, the A2D-R is the one carrying the indicator; the CCMR is the choice when the equipment is built around Class CC rejection blocks.
13) What are the A2D-R terminals and body made of?
Terminals are blade-type tin-plated copper for clip mounting, and the body is PolyTube insulating material. Tin plating on the blades is what keeps clip contact resistance stable over years in a hot motor control center.
14) Can I use a glass tube fuse instead of the Mersen A2D-R?
No. Glass tube fuses like the Littelfuse AGA and AGU series are small ferrule fuses for equipment and automotive-style holders, not a substitute for a Class RK1 blade fuse in a power distribution or motor circuit. The A2D-R is a 250VAC/250VDC rejection-style fuse with 200 kA breaking capacity, which is an entirely different application class.
15) Are Mersen A2D-R fuses RoHS compliant for a spec that requires it?
Yes, the A2D-R family is listed as RoHS compliant, which covers the common institutional and government procurement requirement on electrical components.
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Does the Mersen A2D15R come with a warranty?
Absolutely. The Mersen A2D15R is backed by a manufacturer’s warranty.
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