Mersen USM3 - Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 3-Pole Pressure Plate IP20
Mersen

USM3

Alternate Item Number: USM3

UPC: 782001830007


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Overview

The Mersen UltraSafe™ USM3 is a 3-pole pressure plate fuse holder designed for Midget 1-1/2" x 13/32" (10x38mm) AC and DC-rated fuses up to 30 amperes. Engineered for Class CC (USCC) and Midget fuse applications, this UL Recognized (File E52283) and CSA Certified (Class 6225-01) holder meets IEC 60269-2-1 and 60947-3 standards, ensuring compliance with global safety requirements. Key specifications include 800VAC maximum and 1000VDC maximum operating voltage, with a Short Circuit Current Rating (SCCR) of 200kA AC and 100kA DC. The USM3 features IP20 finger-safe protection, allowing safe fuse changes without tools. Available with or without visual blown-fuse indicators, this modular holder saves up to 15% mounting space and snaps onto 35mm DIN-rail for efficient panel assembly. The durable polyamide body provides exceptional insulating properties and mechanical strength. Recommended for applications including motors, control circuits, transformers, and photovoltaic systems, the USM3 supports fuses such as ATQ, ATM, A6Y-2B, A25Z-2, TRM, OTM, A13X-2, A60Q-2, DCT, HP6M, and HP10M. Terminal screws accept #14 to 6 AWG (2.5 to 16mm²) single conductor wire, with a suggested screw torque of 14.75 in-lbs. The USM3 is ideal for industrial control panels, renewable energy systems, and power distribution where safety and reliability are critical.
  • 3-pole pressure plate fuse holder for Midget 10x38mm fuses up to 30A
  • 800VAC/1000VDC rated with 200kA AC/100kA DC SCCR
  • IP20 finger-safe design for safe fuse changes without tools
  • UL Recognized (E52283) and CSA Certified (Class 6225-01)
  • Saves up to 15% mounting space, DIN-rail mountable for panel efficiency

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
30A
DC Voltage Rating
1000 V
IP Rating
IP20
Material
Polyamide
Maximum Operating Temperature
80 C
Mounting
DIN Rail
Mounting Type
35mm DIN-rail
Number Of Poles
3-pole
Number of poles
3
Operating Temperature, Maximum
176 F
Phase
3
Poles
3
Series
UltraSafe Modular
Size
Midget 1-1/2" x 13/32"
Size
3.07 x 2.07 x 2.32;77.978 x 52.578 x 58.928 in;mm
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 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
Fuse Holder UltraSafe™ 750VAC 1000VDC Midget 30A 3-Pole Cage Clamp IP20

USGM3

Fuse Holder UltraSafe™ 750VAC 1000VDC Midget 30A 3-Pole Cage Clamp IP20
Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 3-Pole LED Pressure Plate IP20

USM3I

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

USM3IN

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

USGM3I

Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 3-Pole LED Cage Clamp IP20
Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 3-Pole+N Pressure Plate IP20

USM3N

Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 3-Pole+N Pressure Plate IP20
Fuse Holder UltraSafe™ 750VAC 1000VDC Midget 30A 3-Pole+N Cage Clamp IP20

USGM3N

Fuse Holder UltraSafe™ 750VAC 1000VDC Midget 30A 3-Pole+N Cage Clamp IP20
Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 1-Pole Pressure Plate IP20

USM1

Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 1-Pole Pressure Plate IP20
Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 2-Pole Pressure Plate IP20

USM2

Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 2-Pole Pressure Plate IP20
Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 4-Pole Pressure Plate IP20

USM4

Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A 4-Pole Pressure Plate IP20
Fuse Holder UltraSafe™ 750VAC 1000VDC Midget 30A 4-Pole Cage Clamp IP20

USGM4

Fuse Holder UltraSafe™ 750VAC 1000VDC Midget 30A 4-Pole Cage Clamp IP20
Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 3-Pole+N LED Cage Clamp IP20

USGM3IN

Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 3-Pole+N LED Cage Clamp IP20
Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 1-Pole LED Pressure Plate IP20

USM1I

Fuse Holder UltraSafe™ 600VAC 600VDC Midget 30A 1-Pole LED Pressure Plate IP20

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.