Mersen USM3IN - Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 3-Pole+N LED Pressure Plate IP20
Mersen

USM3IN

Alternate Item Number: USM3IN

UPC: 782001830021


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Overview

The Mersen USM3IN UltraSafe Modular Fuse Holder (SKU: USM3IN) provides enhanced safety for Midget 1-1/2" x 13/32" AC and DC-rated fuses up to 30 amperes. This 3-pole + Neutral unit meets IEC and DIN standards for "Fingersafe" protection, achieving an IP20 grade, including during fuse changes. It is designed for circuits up to 600VAC and 1000VDC, suitable for motor control, transformers, and photovoltaic applications. The USM3IN features LED indicators for visual blown-fuse status. Constructed from durable polyamide with exceptional insulating properties, it offers a compact footprint, saving up to 15% mounting space. Installation is simplified with 35mm DIN-rail snap-on capability, reducing panel building time. When paired with Class CC fuses for Type "2" No Damage protection, it delivers a highly secure protection package. Key specifications include a maximum voltage rating of 800VAC and 1000VDC, and a maximum amperage of 30A. SCCR is 200kA AC and 100kA DC. Indicator lights require a minimum voltage of 90VAC or 115VDC. Terminal screws accommodate #14 to 6 AWG wire. Approvals include UL Recognized (File E52283), CSA Certified (Class 6225-01), and IEC 60269-2-1/60947-3 compliant.
  • 3-Pole + Neutral configuration
  • 600VAC / 1000VDC rated
  • 30A maximum current rating
  • IP20 Finger-Safe protection
  • LED visual blown-fuse indicators

Specifications

AC Voltage Rating
600 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
600 V
IP Rating
IP20
Material
Polyamide
Maximum Operating Temperature
80 C
Mounting
DIN Rail
Mounting Type
35mm DIN-rail
Number Of Poles
4
Operating Temperature, Maximum
176 F
Phase
3
Poles
3
Series
UltraSafe Modular
Size
3.07 x 2.07 x 2.32;77.978 x 52.578 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
600VAC 600VDC
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
3.07 in x 2.07 in x 2.32 in
Package Dimensions (L x W x H)
77.978 mm x 52.578 mm x 58.928 mm
Package Weight (Imperial)
0.430 lb
Package Weight (Metric)
0.195 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.