Mersen OT5 Fuse OT - Class K5 - Fast-Acting 250VAC 250VDC 5A Ferrule Amp-Trap®
Alternate Item Number: OT5
UPC: 782001700041
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Overview
- Class K5 fast-acting ferrule fuse for general-purpose protection
- Rated 250VAC/DC, 5A, with 50kA AC and 20kA DC interrupting ratings
- UL Listed (Standard 248-9, File E2137) and CSA Certified (Standard C22.2 No. 248.9)
- Ideal for lighting, heating, and non-motor loads in residential/commercial circuits
- Compact ferrule design for easy installation in standard fuse blocks
Specifications
AC Voltage Rating | 250 V |
Amperage Rating | 5 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 | 5 A |
DC Voltage Rating | 250 V |
Interrupt Rating | 50 kA |
Mounting | Clip |
Series | Amp-Trap® |
Size | 2 x 0.56 in |
Size | 50.8 x 14.275 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 14.275 mm x 14.275 mm |
Package Weight (Imperial) | 0.029 lb |
Package Weight (Metric) | 0.013 kg |
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Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
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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 interrupting rating for OT, OTN, and OTS fuses?
OT, OTN, and OTS fuses can safely interrupt available short circuit currents up to 50,000 amperes AC and 20,000 amperes DC.
What voltage and amperage ratings are available for OT fuses?
OT fuses are rated for 250VAC / DC and are available in amperage ratings from 1 to 600A.
What are the voltage and amperage ratings for OTN fuses?
OTN fuses are rated for 250VAC and are available in amperage ratings from 15 to 60A.
What are the voltage and amperage ratings for OTS fuses?
OTS fuses are rated for 600VAC / 300VDC and are available in amperage ratings from 1 to 600A.
What type of circuits are OT, OTN, and OTS fuses suitable for?
These general-purpose fuses are suitable for feeder and branch circuits serving lighting, heating, and other non-motor loads.
Are OT, OTN, and OTS fuses rejection fuses?
No, these are not rejection fuses. Care must be taken to ensure replacement fuses have adequate interrupting ratings.
What Canadian electrical code requirement do OTN 15-60A fuses satisfy?
OTN 15 through 60A fuses satisfy the Canadian electrical code requirement for Type “P,” low melting-point, non-time-delay fuses.
What are the dimensions for 61-100A 250V-OT fuses?
For 61-100A 250V-OT fuses, dimension A is 5-7/8 in, B is 1-1/16 in, C is 1/8 in, D is 3/4 in, and E is 1 in.
What are the dimensions for 201-400A 600V-OTS fuses?
For 201-400A 600V-OTS fuses, dimension A is 11-5/8 in, B is 2-9/16 in, C is 1/4 in, D is 1-5/8 in, and E is 1-7/8 in.
What approvals do these power fuses have?
These fuses are UL Listed to Standard 248-9 File E2137 and CSA Certified to Standard C22.2 No. 248.9. They are also self-certified for DC per UL248.
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.