Mersen OTM3 - Fuse OTM - Midget - Fast-Acting 250VAC 3A Ferrule Amp-Trap®
Mersen

OTM3

Alternate Item Number: OTM3

UPC: 782001705039


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Overview

The Mersen OTM3 is a fast-acting midget fuse engineered for economical, one-time overcurrent protection. This fuse is specifically designed for general-purpose applications where time-delay functionality is not a requirement. It boasts a robust 10kA interrupting rating, ensuring dependable safety for a range of circuits including lighting, heating, and control circuits. The OTM3 is rated for 250VAC and 3A, providing essential protection for these applications. Its compact physical dimensions, measuring 1-1/2" x 13/32" (10 mm x 38 mm), facilitate its use in installations where space is a critical consideration. The OTM3 is a fully rated fuse, guaranteeing performance without any compromises. For enhanced usability and safety, it is compatible with Mersen's UltraSafe™ fuse holders. It is important to note that this fuse is intended for supplemental protection purposes and is not suitable for branch circuit protection. The OTM3 adheres to stringent industry safety standards, meeting UL Standard 248-14 with File E33925 and is CSA Certified to Standard C22.2 No. 248.14. Manufactured by Mersen, this fuse carries the SKU OTM3 and is proudly made in the US. Select the Mersen OTM3 for a cost-effective and reliable protection solution in various non-branch circuit applications.
  • Fast-acting midget fuse for economical, one-time protection
  • Rated 3 Amps, 250 Volts AC with a 10kA interrupting rating
  • Compact 1-1/2" x 13/32" (10 mm x 38 mm) dimensions
  • Suitable for general purpose lighting, heating, and control circuits
  • UL Listed to Standard 248-14 and CSA Certified

Specifications

AC Voltage Rating
250 V
Amperage Rating
3 A
Application
Supplemental protection of circuits up to 250VAC and 10kA
Body Material
Paper
Brand Name
Mersen
Class
Midget
Connection
Ferrule
Connection Material
Tin-Plated Copper
Connection Type
Ferrule
Current Rating
3 A
Fuse Class
Midget
Interrupt Rating
10 kA
Mounting
Clip
Series
Amp-Trap
Size
1.5 x 0.41 in
Size
38.1 x 10.312 mm
Size
Midget
Special Features
Low cost and fully rated for economy without compromise Can be used with UltraSafe™ fuse holders 1 1/2" x 13/32" (10 mm x 38 mm) dimensions
Standard
UL Listed to standard 248-14, File E33925 CSA Certified to Standard C22.2 No. 248.14
Sub Brand
Amp-Trap®
Type
Midget Fuses
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
1.5 in x 0.41 in x 0.41 in
Package Dimensions (L x W x H)
38.1 mm x 10.312 mm x 10.312 mm
Package Weight (Imperial)
0.012 lb
Package Weight (Metric)
0.005 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.

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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.