Mersen OT100 - Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 100A Blade Amp-Trap®
Mersen

OT100

Alternate Item Number: OT100

UPC: 782001700270


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Overview

The Mersen OT100 (SKU: OT100) is a Class K5 fast-acting, one-time fuse engineered for general-purpose protection of feeder and branch circuits. This cost-effective solution is ideal for circuits serving lighting, heating, and other non-motor loads. It provides reliable overcurrent protection with a 100A rating and operates at 250VAC and 250VDC. The fuse features a substantial interrupting rating of 50,000 amperes AC and 20,000 amperes DC, ensuring circuit safety during fault conditions. Designed with a blade terminal type, the OT100 is part of Mersen's trusted Amp-Trap® line. It holds UL Listing to Standard 248-9 (File E2137) and CSA Certification to Standard C22.2 No. 248.9. Manufactured in the US, this fuse is a dependable choice for applications requiring efficient and economical overcurrent protection. Note: OT and OTN fuses are not rejection fuses; always ensure replacement fuses meet or exceed the original interrupting rating. For Canadian applications requiring low melting-point fuses per the Canadian Electrical Code, consult the OTN series (15-60A).
  • Class K5 fast-acting fuse for general-purpose protection
  • 100A rating, 250VAC/DC voltage rating
  • 50kA interrupting rating (AC), 20kA (DC)
  • Blade terminal type for secure connection
  • UL Listed to Standard 248-9 (File E2137) and CSA Certified

Specifications

AC Voltage Rating
250 V
Amperage Rating
100 A
Application
Feeders Branch circuits Resistive heating Residential and small commercial installations
Body Material
PolyTube
Brand Name
Mersen
Class
Class K5
Connection
Blade
Connection Material
Tin-Plated Copper
Connection Type
Blade Terminal
Current Rating
100A
Current Rating
100 A
DC Voltage Rating
250 V
Interrupt Rating
50 kA
Mounting
Clip
Series
Amp-Trap®
Size
5.88 x 1.06 in
Size
149.352 x 27 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 / 250 VDC
Voltage Rating
250VAC 250VDC
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
5.88 in x 1.06 in x 1.06 in
Package Dimensions (L x W x H)
149.352 mm x 27 mm x 27 mm
Package Weight (Imperial)
0.260 lb
Package Weight (Metric)
0.118 kg
Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 75A Blade Amp-Trap®

OT75

Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 75A Blade Amp-Trap®
Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 200A Blade Amp-Trap®

OT200

Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 200A Blade Amp-Trap®
Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 225A Blade Amp-Trap®

OT225

Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 225A Blade Amp-Trap®
Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 30A Ferrule Amp-Trap®

OT30

Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 30A Ferrule Amp-Trap®
Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 20A Ferrule Amp-Trap®

OT20

Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 20A Ferrule Amp-Trap®

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.