Mersen TRM5 - Fuse TRM - Midget - Time-Delay 250VAC 5A Ferrule Tri-Onic®
Mersen

TRM5

Alternate Item Number: TRM5

UPC: 782001743451


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Overview

Mersen TRM5 Tri-Onic® time-delay midget fuse (SKU: TRM5) delivers reliable supplemental overcurrent protection for 250VAC circuits with high inrush loads. Rated 5A, this ferrule-style fuse (10x38mm) features a 12-second time-delay at 200% rating, preventing nuisance openings during motor startups, transformer energization, or other transient conditions. The TRM5 is specifically designed for applications requiring supplemental protection, including small motors, transformers, lighting circuits, and control circuits where temporary overloads are common. UL listed to Standard 248-14 (File E33925) and CSA certified to C22.2 No. 248.14, it meets rigorous safety and performance standards for industrial and commercial use. Compatible with UltraSafe™ fuse holders, the TRM5 offers a compact footprint and broad ampere range (1/10A to 30A) for versatile application across multiple voltage and current requirements. Its ferrule-style design ensures secure mounting in fuse blocks and panels, while the 10kA interrupting rating provides robust fault current protection. Note: The TRM5 is not intended for branch circuit protection, as it is designed for supplemental use only. This fuse is ideal for equipment where reliable operation under transient conditions is critical, such as in HVAC systems, industrial machinery, and lighting ballasts.
  • 250VAC rated, 5A ferrule fuse with 12-second time-delay at 200% rating
  • UL listed to Standard 248-14 (File E33925) and CSA certified to C22.2 No. 248.14
  • Designed for supplemental protection of small motors, transformers, lighting, and control circuits
  • 10x38mm dimensions; compatible with UltraSafe™ fuse holders
  • Interrupting rating: 10kA; not for branch circuit protection

Specifications

AC Voltage Rating
250 V
Amperage Rating
5 A
Application
Small motors Small transformers Lighting circuits Control circuits
Body Material
GMG
Brand Name
Mersen
Class
Midget
Connection
Ferrule
Connection Material
Tin-Plated Copper
Connection Type
Ferrule
Current Rating
5A
Fuse Class
Midget
Interrupt Rating
10 kA
Mounting
Clip
Series
Tri-Onic TRM
Size
1.5 x 0.41 in
Size
38.1 x 10.312 mm
Size
Midget
Special Features
Numerous ratings for a wide variety of applications 250VAC rating in all sizes up to 30A Time-delay for circuits with high inrush currrent Can be used with UltraSafeTM fuse holders 1 1/2" x 13/32" (10mm x 38mm) dimensions
Standard
UL listed to standard 248-14 File E33925 CSA Certified to Standard C22.2 No. 248.14
Sub Brand
Tri-Onic®
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)
0.013 lb
Package Weight (Metric)
0.006 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

9F61BWW460

9F61 Size B Clips 1.6in

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.