Mersen USN - Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A N Pressure Plate IP65
Mersen

USN

Alternate Item Number: USN

UPC: 782001830069


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Overview

Mersen UltraSafe USN Fuse Holder (SKU: USN) delivers unmatched safety and reliability for Class CC (USCC) and Midget 1-1/2" x 13/32" AC/DC fuses up to 30 amperes. Engineered for high-voltage applications, this UL Recognized and CSA Certified holder supports voltages up to 800VAC and 1000VDC with a Short Circuit Current Rating (SCCR) of 200kA AC and 100kA DC. The IP20 finger-safe design ensures compliance with IEC and DIN standards, allowing safe fuse changes without tools. Available in 1, 2, 3, or 4 poles, the USN includes optional visual blown-fuse indicators and can be field-assembled with pin-tie handles for multi-pole configurations. Snap-on 35mm DIN-rail mounting reduces panel space by up to 15%, accelerating installation. Constructed from durable polyamide with exceptional insulating properties, the USN is RoHS-compliant and operates reliably from -40°C to 85°C. Ideal for motors, control circuits, transformers, and photovoltaic systems, the USN pairs seamlessly with Mersen fuses like ATQ, ATM, and A6Y-2B for Type 2 No Damage protection.
  • 800VAC/1000VDC rated, 30A maximum current
  • IP20 finger-safe design for safe fuse changes without tools
  • UL Recognized (E52283) and CSA Certified (Class 6225-01)
  • Available in 1, 2, 3, or 4 poles with optional blown-fuse indicators
  • Snap-on 35mm DIN-rail mounting for space-saving panel installation

Specifications

AC Voltage Rating
800 V
Amperage Rating
30 A
Application
All circuits up to 600 volts for motors, control circuits, transformers, etc… DC circuits up to 1000VDC including photovoltaic applications Non-load disconnect
Brand Name
Mersen
Class
Midget
Connection
Pressure Plate
Connection Type
Pressure Plate
Current Rating
30 A
DC Voltage Rating
1000 V
IP Rating
IP65
Material
Polyamide
Maximum Operating Temperature
80 C
Mounting
DIN Rail
Mounting Type
35mm DIN-rail
Number Of Poles
1
Operating Temperature, Maximum
176 F
Phase
1
Poles
1
Series
UltraSafe Modular
Size
3.07 x 0.69 x 2.32;77.978 x 17.526 x 58.928 in;mm
Size
1-1/2" x 13/32"
Special Features
IP20 Finger-Safe (touch safe) Optional visual blown fuse Indicator lights DIN-rail mounting Compact footprint Quick, tool-free, easy fuse change outs USM use with: ATQ, ATM, A6Y-2B, A25Z-2, TRM, OTM, A13X-2, A60Q-2, DCT, HP6M, HP10M USCC use with: ATDR, ATMR, ATQR ATM, DCT, ATMR recommended for DC applications
Standard
UL Listed to Standard 4248- 4 (class CC) and UL Recognized to Standard 4248-1 (midget), File E52283 UL Listed to standard 4248-18 (photovoltaic), File E347822 CSA Certified C22.2 IEC 60269-2-1 and 60947-3 Compliant (USM only)
Sub Brand
UltraSafe™
Type
UL/CSA Fuse Holders
Voltage Rating
800VAC 1000VDC
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
3.07 in x 0.69 in x 2.32 in
Package Dimensions (L x W x H)
77.978 mm x 17.526 mm x 58.928 mm
Package Weight (Imperial)
0.140 lb
Package Weight (Metric)
0.064 kg
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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.