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Mersen A2K12R A6K-R Series Class RK1 Fast-Acting Fuse
The Mersen A6K-R Series Amp-Trap® fuse is a current-limiting, Class RK1 fast-acting fuse engineered for branch/feeder circuit protection and back-up protection where high available short-circuit currents exist. Rated 600VAC / 300VDC with an AC Max I.R./Breaking Capacity of 200 kA, this fuse is built for demanding commercial and industrial power distribution systems. This family is available with either Blade or Ferrule connection types to match standard fuse holders and fuse blocks, both using tin-plated copper connection/terminal material for dependable conductivity. The fuse is RoHS Compliant for environmental compliance and rated for 50/60 Hz electrical systems.
Key Features
- Fuse Class: Class RK1 current-limiting fuse designed for excellent protection where high available short-circuit currents exist.
- Speed/Characteristic: Fast-Acting response helps clear overcurrent conditions quickly on branch/feeder circuits.
- Voltage Rating: Rated 600VAC and 300VDC (AC/DC) for flexible application across AC and DC systems.
- Interrupt Rating: AC Max I.R./Breaking Capacity: I1 of 200 kA for reliable performance under high fault-current conditions.
- Connection Type: Available in Blade or Ferrule configurations for compatibility with standard fuse holders and fuse blocks.
- Terminal Material: Tin-Plated Copper connection/terminal material for consistent, corrosion-resistant conductivity.
- Frequency: Rated for 50/60 Hz electrical systems.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- ROHS Compliant: Yes
- Voltage Rating: 600VAC/300VDC
- Fuse Class: RK1
- Breaking Capacity: 200 kA AC Max I.R.
- Terminal Material: Tin-Plated Copper
- Connection Type Options: Blade, Ferrule
Typical Applications
- Branch and Feeder Circuit Protection
- Back-Up Protection for Circuit Breakers and Other Overcurrent Devices
- Commercial and Industrial Electrical Distribution Systems
- High Available Short-Circuit Current Applications
- AC and DC Power Distribution Systems
Why Mersen?
Mersen's Amp-Trap® A6K-R Series delivers current-limiting, fast-acting Class RK1 protection with a 200 kA AC Max I.R./Breaking Capacity, making it well-suited for high fault-current environments in commercial and industrial installations. Offered in both Blade and Ferrule connection types with tin-plated copper terminal construction, 600VAC/300VDC ratings, and RoHS Compliance, this Mersen fuse family supports reliable, code-compliant overcurrent protection for professional electrical work.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Mounting Method:
- Clip
- Connection/Terminal Material:
- Tin-Plated Copper
- AC Max I.R./Breaking Capacity: I1:
- 200 kA
- ROHS Compliant:
- Yes
- Frequency (Hz):
- 50/60 Hz
- Speed/Characteristic:
- Fast-Acting
- AC or DC:
- AC/DC
- Fuse Class:
- Class RK1
- list_batch:
- MERSEN-20260825
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Type:
- Fast-Acting Fuse
- Series:
- A6K-R
- Voltage Rating:
- 600VAC/300VDC
- Product Material:
- Copper
- Product Finish:
- Tin-Plated
- Standards:
- RoHS Compliant
- Product Subgroup:
- Fuses
Mersen A2K12R – Frequently Asked Questions
1) Will a Mersen A6K-R Class RK1 fuse drop into my existing Class R fuse clips?
The A6K-R Series is a Class RK1 fuse with clip mounting, so it seats in standard Class R fuse clips and blocks. It comes in two connection styles: ferrule (MPN A2K12R) and blade (MPN A6K300R). Class R blocks with the rejection feature accept Class R fuses only, so match the connection style to the holder you already have before ordering.
2) Can I use the Mersen A6K-R fuse on a DC circuit as well as AC?
Yes. The A6K-R Series is rated 600VAC and 300VDC, so it works in both AC and DC power distribution. On AC it is rated for 50/60 Hz systems. Do not apply it above 300V on the DC side.
3) Is 200 kA interrupting rating enough for a high fault current service entrance?
The A6K-R carries an AC max interrupting rating of 200 kA, which is the top end for Class R fuses and covers service points with high available short circuit current. Being current-limiting, it also cuts let-through energy, which is why it is used as back-up protection ahead of circuit breakers with lower interrupting ratings.
4) Fast-acting or time-delay: which Class R fuse should I use for a motor circuit?
The A6K-R is fast-acting, so it clears overcurrent quickly on branch and feeder circuits and for back-up protection. That speed is a problem on motor starting inrush, which will nuisance-blow a fast-acting fuse sized to the running load. For motor loads, a time-delay fuse is the right choice, such as the Littelfuse CCMR Series Class CC time-delay fuse (CCMR040, 40A).
5) Can a Littelfuse CCMR040 Class CC fuse be used in place of a Mersen A6K-R series Class RK1 fuse?
No. The Mersen A6K-R series is a Class RK1 fast-acting fuse rated 600VAC/300VDC, and it mounts in clips sized for Class RK1 ferrule or blade bodies. The Littelfuse CCMR040 is a Class CC time-delay fuse, a different and much smaller body class that seats in Class CC holders and rejection clips, and its time-delay characteristic lets it ride through inrush rather than clearing fast. The two are not dimensionally or electrically interchangeable; a Class RK1 holder needs a Class RK1 fuse.
6) I need a fast-acting fuse but the circuit is only 250V control wiring - is there a smaller option than the Mersen A6K-R?
Yes. The Mersen A6K-R series is a 600VAC/300VDC Class RK1 fuse with a 200 kA AC breaking capacity, sized for branch and feeder protection in high fault-current distribution gear. For 250V control circuits, the Littelfuse BLF series is a midget fast-acting fuse rated 250V in a laminated tube body, which fits midget-size fuse blocks rather than Class RK1 clips. Both are fast-acting; they differ in voltage rating and physical size, so confirm the holder you are feeding.
7) My meter has a dedicated fuse pack - do I order the Mersen A6K-R for that?
No. Metering circuits typically take a small, low-amperage fuse matched to the instrument; the Square D PowerLogic energy meter fuse pack is supplied as a set of three 0.5A 600V fuses for that purpose. The Mersen A6K-R series is a Class RK1 fast-acting power fuse rated 600VAC/300VDC with 200 kA AC interrupting capacity, used for branch, feeder, and back-up protection in distribution equipment rather than inside meter potential circuits.
8) Is the Mersen A6K-R fuse RoHS compliant for a specification that requires it?
Yes, the A6K-R Series is RoHS compliant, which is the standard listed for this family. Terminals are tin-plated copper, so there is no lead-bearing plating on the contact surfaces.
9) Will tin-plated copper terminals hold up in a damp or industrial panel?
The connection ends on the A6K-R are tin-plated copper. Tin plating resists corrosion on the clip contact surface, which keeps contact resistance and heating down in humid or dirty industrial enclosures, and copper underneath carries the current.
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Does the Mersen A2K12R come with a warranty?
Absolutely. The Mersen A2K12R is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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