Mersen A2K12R Fuse A2K-R - Class RK1 - Fast-Acting 250VAC 250VDC 12A Ferrule Amp-Trap®
Alternate Item Number: A2K12R
UPC: 782001915056
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Overview
- Class RK1 fast-acting fuse for AC/DC circuits up to 250V
- 12 Amp rating with 200kA AC / 20kA DC interrupting rating
- Rejection-style construction prevents misapplication
- Minimum trip indicator operating voltage: 90V
Specifications
AC Voltage Rating | 250 V |
Amperage Rating | 12 A |
Application | Load centers Panelboards Switchboards Bus duct Feeder circuits Non-inductive loads Lighting circuits |
Body Material | GMG |
Brand Name | Mersen |
Class | Class RK1 |
Connection | Ferrule |
Connection Material | Tin-Plated Copper |
Connection Type | Ferrule |
Current Rating | 12A |
DC Voltage Rating | 250 V |
Fuse Class | RK1 |
Interrupt Rating | 200 kA |
Material | Fiberglass |
Mounting | Clip |
Nema Rating | Class RK1 |
Series | Amp-Trap® |
Size | 2 x 0.56 in |
Size | 50.8 x 14.275 mm |
Special Features | Rejection style design prevents replacement by other fuse classes Fiberglass body provides dimensional stability in harsh industrial environments Easy-to-read imprint label for quick recognition and replacement High degree of current limitation for low peak let-thru current |
Standard | UL listed to standard 248-12 File E2137 CSA certified to standard C22.2 No. 248.12 Self-certified for DC per UL248 |
Sub Brand | Amp-Trap® |
Type | Class RK1 |
Voltage Rating | 250 VAC |
Package Dimensions (L x W x H) | 2 in x 0.56 in x 0.56 in |
Package Dimensions (L x W x H) | 50.8 mm x 14.275 mm x 14.275 mm |
Package Weight (Imperial) | 0.038 lb |
Package Weight (Metric) | 0.017 kg |
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
Frequently Asked Questions
What is the voltage rating for A2K fuses?
The A2K fuses have a voltage rating of 250VAC / DC.
What is the amperage range for A2K and A6K fuses?
Both A2K and A6K fuses are available in amperage ratings from 1 to 600A.
What are the interrupting ratings for A2K and A6K fuses?
The interrupting ratings are 200kA I.R. AC and 20kA I.R. DC for both A2K and A6K fuses.
Are these fuses UL listed and CSA certified?
Yes, they are UL listed to standard 248-12 and CSA certified to standard C22.2 No. 248.12.
What is the voltage rating for A6K fuses?
The A6K fuses have a voltage rating of 600VAC / 300VDC.
What are the key features of A2K and A6K fuses?
Key features include being highly current-limiting, fast-acting, and having a rejection style design.
What applications are A2K and A6K fuses suitable for?
These fuses are suitable for loadcenters, panelboards, switchboards, bus duct, feeder circuits, non-inductive loads, and lighting circuits.
What is the DC interrupting rating for these fuses?
The DC interrupting rating for these fuses is 20kA I.R. DC.
What is the AC interrupting rating for these fuses?
The AC interrupting rating for these fuses is 200kA I.R. AC.
What is the purpose of the rejection style design?
The rejection style design prevents the fuse from being replaced by other fuse classes.
Frequently Asked Questions about Mersen
What industries and applications are Mersen products used for?
Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.
What are the main product lines offered by Mersen?
Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.
What are the key features of Mersen products?
Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.
What environmental ratings do Mersen products have?
Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.
What accessories are available for Mersen products?
Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.
How are Mersen products typically installed?
Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.
What certifications and standards do Mersen products comply with?
Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.
What technical support does Mersen offer?
Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.