Mersen T331171 - Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 22x58 3-Pole Microswitch Pressure Plate IP20
Mersen

T331171

Alternate Item Number: US223M

UPC: 782001311407

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Minimum Qty: 2

Multiplier: 2

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Overview

The Mersen T331171 UltraSafe™ fuse holder is a 3-pole, UL-listed device designed for robust electrical protection in industrial applications. It supports fuse sizes of 22x58mm and is rated for 800VAC and 1000VDC, ensuring compatibility with a wide range of power systems. Engineered for finger-safe operation according to IEC standards, this holder prioritizes user safety during fuse replacement. The integrated microswitch and pressure plate mechanism facilitate quick and secure fuse changes with minimal effort. With an IP20 ingress protection rating, it offers protection against solid objects larger than 12.5mm. The modular design allows for flexible configurations, supporting 1-, 2-, 3-, or 4-pole setups, with options for visual blown fuse indicators. Multi-pole units can be assembled in the field using a pin-ties kit. Optional microswitches, either included or ordered separately, provide remote status indication of fuse integrity. Constructed from durable thermoplastic or thermoset materials, the T331171 meets stringent UL and IEC requirements. This makes it an ideal choice for industrial control panels, motor protection circuits, and power distribution systems where reliable and safe fuse management is paramount. SKU: T331171. Country of Origin: US.
  • 3-Pole configuration for versatile circuit protection
  • Rated for 800VAC and 1000VDC applications
  • Finger-safe operation per IEC standards
  • IP20 ingress protection for enhanced safety
  • Includes microswitch and pressure plate for easy fuse replacement

Specifications

AC Voltage Rating
800 V
Amperage Rating
125 Amps
Application
All circuits up to 750VAC for protection of motors, transformers, low voltage distribution, control circuits Non-load operation
Brand Name
Mersen
Class
IEC Cylindrical 22x58mm
Connection
Pressure Plate
Connection Type
Panel / DIN rail
DC Voltage Rating
1000 V
IP Rating
IP20
Material
Polyamide
Material
Thermoplastic / Thermoset
Material
thermoplastic or thermoset
Maximum Operating Temperature
60 C
Minimum Operating Temperature
-25 C
Mounting
DIN rail acc. EN 60715
Mounting Type
Panel mounting, DIN rail
Mounting Type
Panel / DIN rail
Number Of Poles
3
Operating Temperature, Maximum
140 F
Operating Temperature, Minimum
-13 F
Phase
3
Poles
3
Poles
3-pole
Poles
3P
Series
UltraSafe
Series
UltraSafe™
Size
3.01 x 4.13 x 5.02;76.5 x 105 x 127.5 in;mm
Size
22x58
Special Features
Finger safe Degree of protection: IP20 Optional visual blown fuse indicator & microswitch DIN rail mounting Modular design Lockable Multi-pole assembly kit available Sealable in closed and open position Plastic material UL94V2 mini Flame retardant materials with glow wire flammability index to 960°C
Standard
UL Recognized Component, UL4248, guide IZLT2, file E52283 CSA Certified C22.2, class 6225, file 32169 IEC 60269-2 and IEC 60947-3 RoHS Compliant Plastic material: NF 16101 & 16102 Requirement 2 Compliant
Sub Brand
UltraSafe™
Type
UL/CSA Fuse Holders
Voltage Rating
800VAC 1000VDC
Voltage Rating
800VAC/1000VDC
Voltage Rating
750 VAC
Package Dimensions (L x W x H)
3.01 in x 4.13 in x 5.02 in
Package Dimensions (L x W x H)
76.5 mm x 105 mm x 127.5 mm
Package Weight (Imperial)
1.477 lb
Package Weight (Metric)
0.670 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.