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Mersen Amp-Trap Class RK1 Fast-Acting Fuse, 250VAC/250VDC Ferrule Terminal
The Mersen Amp-Trap Class RK1 Fast-Acting Fuse family delivers professional overcurrent protection rated 250VAC/250VDC for both AC and DC circuits, available across a range of ampere ratings to match specific circuit requirements. Built with a GMG body insulating material and ferrule terminal connections using tin-plated copper for reliable conductivity, these fuses provide up to 200 kA breaking capacity to safely handle high fault currents. The Class RK1 fast-acting speed characteristic clears faults quickly, helping minimize equipment damage in demanding commercial and industrial applications.
Key Features
- Ampere Rating: Offered across multiple ampere ratings for precise overcurrent protection matched to medium-duty electrical circuits and equipment.
- Class RK1 Fast-Acting Response: Delivers rapid fault clearing to minimize equipment damage and enhance system protection reliability.
- 250VAC/250VDC Dual Voltage: Offers versatile protection for both AC and DC applications with consistent performance across voltage types.
- 200 kA Breaking Capacity: Handles high fault currents safely, providing superior interrupting capability for critical protection applications.
- Ferrule Terminal Design: Ensures secure, reliable connections with tin-plated copper terminals for optimal conductivity and corrosion resistance.
- GMG Body Construction: Features professional-grade insulating material for enhanced durability and electrical isolation performance.
- Clip Mounting: Supports 50/60 Hz operation with a clip mounting method compatible with standard fuse holders.
- RoHS Compliant: Meets environmental standards for responsible electrical component manufacturing and installation.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- Body Insulating Material: GMG
- Rohs Compliant: Yes
Typical Applications
- Industrial Control Panels and Motor Control Centers
- Commercial Electrical Distribution Systems
- HVAC Equipment Protection
- Power Supply and Converter Applications
- Instrumentation and Control Circuits
- Emergency Power Systems
Why Mersen?
Mersen delivers professional-grade fuse protection with RoHS compliant construction and proven Class RK1 fast-acting performance. The combination of 200 kA breaking capacity, dual 250VAC/250VDC voltage rating, GMG body insulating material, and tin-plated copper ferrule terminal design ensures reliable circuit protection for critical electrical applications requiring superior interrupting capability and consistent, code-compliant performance.
Manufacturer Resources
Product Specs
- Product Material:
- GMG
- Product Type:
- Fuse
- Voltage Rating:
- 250VAC/250VDC
- Listing:
- RoHS Compliant
- Department:
- Electrical
- Product Group:
- Wiring Devices
Mersen A2K3R – Frequently Asked Questions
1) Can the Mersen A2K Amp-Trap fuse be used on a DC circuit, or is it AC only?
Both. The A2K Amp-Trap Class RK1 fast-acting fuse carries a 250VAC/250VDC rating, so it protects DC buses, converters and power supplies as well as 50/60 Hz AC branch circuits. Same fuse, same part number either way, so you are not sourcing a separate DC device for a mixed panel.
2) Will a Class RK1 fuse drop into my existing Class RK5 or Class H fuse clips?
Yes. Class RK1 is a rejection-style Class R fuse with a ferrule terminal and clip mounting, dimensionally the same as Class RK5 and Class H fuses of the same amp and voltage rating. It fits standard fuse holders and clips. The one-way rule applies: a Class R fuse goes into a standard non-rejection holder, but if your holder has the rejection feature installed, only Class R fuses will go in, which is the point of the design.
3) Is 200 kA interrupting rating enough for a service-entrance or motor control center location?
The A2K Amp-Trap is rated for 200 kA breaking capacity, which is the highest interrupting rating commonly published for branch-circuit fuses and covers essentially any available fault current you will calculate at an industrial panel, MCC or commercial distribution board. What matters on your job is that the fuse rating equals or exceeds the available fault current from your short-circuit study at that point.
4) Should I use a fast-acting RK1 fuse or a time-delay fuse for a motor circuit?
Use time-delay for motor branch circuits. The A2K is fast-acting, which clears a fault quickly to limit let-through energy, and that is what you want ahead of semiconductors, control power, converters and distribution feeders. A fast-acting fuse sized for motor running current will nuisance-open on locked-rotor inrush. For a motor, look at a time-delay type such as the Littelfuse CCMR Series Class CC time-delay fuse, offered here in a 40A rating.
5) Can I use a 250V fuse on a 480V circuit?
No. The A2K Amp-Trap is rated 250VAC/250VDC and must not be applied above that. On a 480V system you need a 600V-rated Class R fuse instead. A fuse applied over its voltage rating may not interrupt the arc, which is the one failure mode a fuse exists to prevent. Using a 250V fuse on a 120V or 208V circuit is fine, since the rating is a maximum.
6) What is the difference between the Mersen A2K Amp-Trap fuse and a Littelfuse CCMR Class CC fuse for a motor circuit?
They differ in both class and speed characteristic. The Mersen A2K Amp-Trap is a Class RK1 fast-acting fuse rated 250VAC/250VDC with a ferrule terminal and clip mounting, so it clears faults quickly and drops into standard Class R fuse clips. The Littelfuse CCMR is a Class CC time-delay fuse, offered in a 40A rating, and time-delay construction is what lets a fuse ride through motor inrush without opening. Class CC and Class R fuse blocks are not interchangeable, so the choice also has to match the holder already in the panel. For a motor branch circuit that nuisance-opens on start, the time-delay CCMR is the behavior you want; for fast fault clearing on control and distribution circuits, the A2K is the fast-acting option.
7) What amp ratings does the Mersen A2K Amp-Trap RK1 fuse come in?
Two ampere ratings are offered: 3A (part A2K3R) and 30A (part A2K30R). Pick by the circuit or equipment you are protecting, not by the holder, since both share the same Class RK1 ferrule body style.
8) What is the difference between the Mersen A2K RK1 fuse and a midget or glass tube fuse like the Littelfuse BLF or AGU?
Size and duty, not just brand. The A2K is a Class R ferrule fuse for industrial and commercial distribution, with 200 kA breaking capacity at 250VAC/250VDC. The Littelfuse BLF Series is a midget fast-acting fuse rated 250V in a laminated tube, a physically smaller body used in control and supplementary protection. The Littelfuse AGU and AGA Series are glass tube fuses, typically supplementary rather than branch-circuit protection. They are not interchangeable with Class R clips.
9) Is a Littelfuse AGU or AGA glass fuse an alternative to the Mersen A2K Amp-Trap?
They serve different duty. The Littelfuse AGA series, such as the 5A AGA5, and the AGU series are glass tube fuses used for low-energy electronic and automotive-style circuits. The Mersen A2K Amp-Trap is a Class RK1 fast-acting fuse rated 250VAC/250VDC with 200 kA breaking capacity and a tin-plated copper ferrule terminal, built for industrial control panels, motor control centers and commercial distribution where high available fault current has to be interrupted. On a branch circuit inside a panel, a glass tube fuse is not the equivalent part.
10) For metering circuits, should I use the Mersen A2K Amp-Trap or the Square D PowerLogic fuse pack?
Match the fuse to the instrument. The Square D PowerLogic energy meter fuse pack is a set of three fuses rated 0.5A at 600V, intended for the voltage-sensing leads of a PowerLogic energy meter, and the 600V rating suits metering taps on higher-voltage systems. The Mersen A2K Amp-Trap is a Class RK1 fast-acting fuse rated 250VAC/250VDC offered in ratings such as 3A and 30A for general overcurrent protection on control and distribution circuits. If you are fusing the potential leads of a PowerLogic meter, use the meter fuse pack; the A2K is the choice for the circuit the panel itself is protecting.
11) Is the Mersen Amp-Trap A2K fuse RoHS compliant for a spec that requires it?
Yes, the A2K Amp-Trap is RoHS compliant. That is the compliance item published on it, so if your submittal calls for RoHS on electrical components it clears. Nothing beyond RoHS should be represented on the submittal from this data alone.
12) What are the fuse terminals and body made of, and will they hold up in a humid mechanical room?
The ferrule terminals are tin-plated copper, which gives good conductivity and resists corrosion at the clip contact, the usual failure point in damp or coastal plant rooms. The body is GMG insulating material. Contact pressure in the clips still matters more than anything else for heat, so clean and tension old clips when you swap fuses in.
13) I need three matching fuses for a three-phase panel, does the A2K come in a set?
The A2K Amp-Trap is ordered as an individual fuse by amp rating, A2K3R or A2K30R, so for a three-phase feeder you order three of the same part number. If you specifically want a pre-matched multi-fuse pack, the Square D PowerLogic energy meter fuse pack ships as a set of three at 0.5A 600V, though that is a metering fuse and not a substitute for a Class R branch fuse.
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Does the Mersen A2K3R come with a warranty?
Absolutely. The Mersen A2K3R is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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