Mersen K084120 - Miniature Fuses Size 5x20 250V 0.8A Medium time-lag SA Clip Mounting
Mersen

K084120

Alternate Item Number: MI5SA25V0.8


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Specification Sheet

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Overview

Mersen’s K084120 miniature fuse (SKU: K084120) is a 5x20mm glass-body fuse rated for 250V with a 0.8A current rating and medium time-lag (SA) characteristics. Designed for clip mounting, this fuse provides reliable overcurrent protection for sensitive electronic components, including semiconductor devices and control apparatus. The medium time-lag design allows it to handle short-term surges without nuisance tripping, making it ideal for applications with inrush currents such as power supplies, industrial controls, and instrumentation. The 5x20mm form factor ensures compatibility with standard fuse holders and panels, while the SA time-lag classification balances fast response for faults with sufficient tolerance for transient loads. Built with high-quality materials, the K084120 delivers consistent performance and long service life in demanding environments. Available in both clip-mount and axial lead configurations, this fuse is a versatile choice for OEMs and system integrators requiring dependable protection for 125V–250V circuits.
  • 5x20mm glass-body fuse for compact installations
  • 250V rating with 0.8A medium time-lag (SA) response
  • Clip mounting for secure retention in fuse holders
  • Handles short-term surges without nuisance tripping
  • Compatible with 125V–250V circuits and sensitive electronics

Specifications

Package Dimensions (L x W x H)
0.79 in x 0.2 in x 0.2 in
Package Dimensions (L x W x H)
20 mm x 5 mm x 5 mm
Package Weight (Imperial)
0.0030 lb
Package Weight (Metric)
0.0010 kg

Frequently Asked Questions

What is the voltage rating of this fuse?

The fuse is rated for 250V, suitable for 125V–250V circuits.

What is the mounting type for this fuse?

The fuse uses clip mounting for secure installation in standard fuse holders.

What are the dimensions of this fuse?

The fuse measures 5x20mm, a standard miniature fuse size.

Is this fuse suitable for semiconductor protection?

Yes, the medium time-lag design safeguards sensitive semiconductor devices from overcurrent.

What does SA time-lag mean?

SA time-lag indicates a medium response time, balancing surge tolerance with fault protection.

Can this fuse be used in industrial control panels?

Yes, the 250V rating and clip mounting make it suitable for industrial control applications.

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.