Mersen G227959 - Mersen UltraSafe US14 and US22 modular fuseholders offer the highest levels of safety and features for IEC Cylindrical 14x51mm fuses and 22x58mm. Like all UltraSafe fuseholders, they qualify as "finger safe" to an IP20 grade of protection under IEC standards. These fuseholders come standard with a mechanical indicator that indicates fuse presence. If a fuse with a mechanical striker is used, the fuseholders mechanical indicator will also indicate a blown fuse. Microswitches can be supplied with the fuseholders if desired to allow for remote blown fuse indication. These fuseholders also feature padlocking capabilities. 750 Volts 125 Amps single pole microswitch series.
Mersen

G227959

Alternate Item Number: 782001311469

UPC: 782001311469

Contact for Pricing

Overview

The Mersen UltraSafe US14 and US22 modular fuseholders (SKU G227959) provide superior safety and functionality for IEC cylindrical fuses (14x51mm and 22x58mm). Rated for 750V and up to 125A, these fuseholders offer robust overcurrent protection for critical industrial applications. They are certified "finger-safe" to IP20 under IEC standards, ensuring operator safety during fuse inspection and replacement. A standard mechanical indicator confirms fuse presence and signals a blown fuse when used with striker fuses. Optional microswitches are available for remote blown-fuse indication, ideal for automated systems. Padlocking capabilities enhance security. The US14 series is compatible with 14x51mm fuses like A70QS, A70P, URC, and URD. The US22 series supports 22x58mm fuses such as A70QS and URD. Both ranges feature DIN-rail mounting with a unique latching system for easy repositioning and field assembly of multi-pole units. Applications include protection for small inverters, UPS systems, and motor drives in renewable energy, industrial automation, and data centers. They meet UL4248, CSA C22.2 Class 6225, and IEC 60269-1/60947-3 standards, with a 200kA SCCR. Constructed from durable thermoplastic or thermoset materials, these fuseholders are designed for reliability in demanding environments.
  • IP20 "finger-safe" protection under IEC standards
  • Accommodates IEC cylindrical fuses: 14x51mm (US14) and 22x58mm (US22)
  • Rated for 750V AC/DC and up to 125A
  • Standard mechanical fuse presence and blown fuse indicator
  • Optional microswitches for remote blown fuse indication
  • Padlocking capability for enhanced safety
  • DIN-rail mounting with a unique latching system for easy repositioning
  • Field-assemblable multi-pole units
  • 200kA SCCR for reliable performance under fault conditions
  • Compliant with UL4248, CSA C22.2, and IEC 60269-1/60947-3 standards

Specifications

Application
All circuits up to 750V requiring semiconductor fuses for protection of small inverters, UPS systems, motor drives, etc…
Brand Name
Ferraz Shawmut
Class
Accessory
Current Rating
125 A
IP Rating
IP20
Mounting Type
DIN-Rail
Poles
1
Series
UltraSafe US14/US22
Size
14x51mm & 22x58mm
Special Features
Finger-safe Optional blown fuse indicator lights Optional microswitches DIN-rail mount Compact footprint Quick, easy fuse change-outs
Standard
UL Recognized Component to standard 4248-1, File E52283 CSA Certified C22.2, Class 6225, File 32169 IEC Compliant to 60269-2-1, 60947-3
Type
UltraSafe
Voltage Rating
750 VAC
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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.