Mersen OTN30 - OTN Fuse OT - Class K5 - Fast-Acting 250VAC 30A Ferrule Amp-Trap®
Mersen

OTN30

Alternate Item Number: OTN30

UPC: 068938831035


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Overview

The Mersen OTN30 Class K-5 Fast-Acting Ferrule Amp-Trap® Fuse delivers cost-effective overcurrent protection for feeder and branch circuits serving non-motor loads such as lighting, heating, and resistive applications. Rated at 250VAC and 30A, this fuse safely interrupts short-circuit currents up to 50,000 amperes, ensuring reliable performance in industrial and commercial installations. Designed for Canadian compliance, the OTN30 meets UL 248-9 and CSA C22.2 No. 248.9 standards, including Type P low-melting-point requirements for 15–60A ratings. Its fast-acting response provides immediate protection without time delay, making it ideal for circuits where rapid fault interruption is critical. The fuse features an easy-to-read imprint label for quick identification and replacement, reducing downtime during maintenance. Compatible with standard fuse blocks and box connectors, the OTN30 integrates seamlessly into existing systems while offering the lowest-cost protection for non-inductive loads. Suitable for residential, small commercial, and industrial applications, this fuse delivers dependable performance in environments requiring high interrupting ratings and economic solutions.
  • 250VAC rated, 30A current, fast-acting Class K-5 fuse
  • Interrupts short-circuit currents up to 50,000 amperes
  • Meets UL 248-9 and CSA C22.2 No. 248.9 standards
  • Type P low-melting-point design for Canadian compliance (15–60A)
  • Easy-to-read imprint label for quick identification and replacement

Specifications

AC Voltage Rating
250 V
Amperage Rating
30 A
Application
Feeders Branch circuits Resistive heating Residential and small commercial installations
Body Material
Paper
Brand Name
Mersen
Class
Class K5
Connection
Ferrule
Connection Material
Copper
Connection Type
Ferrule
Current Rating
30 A
Interrupt Rating
10 kA
Material
Ferrule Amp-Trap
Mounting
Clip
Series
Amp-Trap
Size
2 x 0.56 in
Size
50.8 x 14.224 mm
Special Features
Easy to read imprint label for quick recognition and replacement Low cost for high protection value
Standard
UL Listed to Standard 248-9 File E2137 CSA Certified to Standard C22.2 No. 248.9 (The Canadian Electrical Code requires these fuses in ratings 15 through 60A to be of the low melting point design use OTN 15-60.) Self-certified for DC per UL248
Sub Brand
Amp-Trap®
Type
Class K5
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 14.224 mm x 14.224 mm
Package Weight (Imperial)
0.040 lb
Package Weight (Metric)
0.018 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.

LCC5

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.
9F61 Size B Clips 1.6in

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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.