Mersen K331140 - Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 2-Pole Visual Indicator Microswitch Pressure Plate IP20
Mersen

K331140

Alternate Item Number: US142MI

UPC: 782001310998

Contact for Pricing

Minimum Qty: 3

Multiplier: 3

*Contact for lower quantities*

Overview

The Mersen K331140 is a 2-pole UltraSafe™ modular fuse holder designed for 14x51mm fuse links, offering robust protection and enhanced safety for circuits up to 750VAC/DC. Engineered to meet stringent IEC standards, this fuse holder provides finger-safe operation with an IP20 degree of protection, ensuring user safety even during fuse replacement. The modular design allows for flexible configuration, including field assembly into multi-pole units using available pin-tie kits. This specific model (K331140) features a visual blown fuse indicator and an integrated microswitch, enabling remote indication of fuse status. The microswitch can be supplied with the holder or ordered separately for field installation, facilitating integration into control and monitoring systems. Constructed from durable thermoplastic or thermoset material with a UL94V2 rating, the UltraSafe™ range is flame retardant and resistant to glow wire ignition. The holder supports a maximum operational current of 50A for 14x51mm fuses and boasts a Short Circuit Current Rating (SCCR) of 200kA. Applications include the protection of small inverters, UPS systems, and motor drives where reliable no-load disconnection and IP20 requirements are critical. The unit is designed for easy DIN rail mounting with a unique latching system for repositioning and offers padlocking capabilities for added security. Approvals include UL4248, UL Recognized Component (IZLT2, File E52283), CSA Certified (C22.2, class 6225, File 32169), and IEC Compliance (60947-3). Recommended fuse usage for the US14 series includes Mersen's A70QS, A70P, URC, and URD fuse links.
  • Finger-safe operation with IP20 protection under IEC standards
  • Accommodates 14x51mm fuse links with a 50A rating and 200kA SCCR
  • Includes visual blown fuse indicator and auxiliary microswitch for remote signaling
  • Modular design for flexible pole configuration and DIN rail mounting
  • Durable thermoplastic/thermoset construction, flame retardant (UL94V2)

Specifications

AC Voltage Rating
800 V
Amperage Rating
50 A
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 14x51mm
Connection
Pressure Plate
DC Voltage Rating
1000 V
Material
Polyamide
Maximum Operating Temperature
60 C
Minimum Operating Temperature
-25 C
Mounting
DIN rail acc. EN 60715
Number Of Poles
2
Operating Temperature, Maximum
140 F
Operating Temperature, Minimum
-13 F
Phase
2
Size
3.01 x 2.09 x 4.36;76.5 x 53 x 110.8 in;mm
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
750 VAC
Package Dimensions (L x W x H)
3.01 in x 2.09 in x 4.36 in
Package Dimensions (L x W x H)
76.5 mm x 53 mm x 110.8 mm
Package Weight (Imperial)
0.683 lb
Package Weight (Metric)
0.310 kg
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 2-Pole Visual Indicator Pressure Plate IP20

H331138

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 2-Pole Visual Indicator Pressure Plate IP20
Modular fuse holder 2P 600V with LED

57050012

Modular fuse holder 2P 600V with LED
Unclassified Transformrs. Small Core & Cl Tran. 9t58 Ip C&C Kit Xfrmr. Fuse Kits For EncapsulTED Xfmrs. 0000G24

9T58K0000G24

Unclassified Transformrs. Small Core & Cl Tran. 9t58 Ip C&C Kit Xfrmr. Fuse Kits For EncapsulTED Xfmrs. 0000G24
The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.

LEYBA

The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.
Fuse holder FEC

18813000019

Fuse holder FEC
Terminal Covers (2 Covers Per Kit). Field installed primary and secondary IEC Touch Proof Cover Kit.

IP20

Terminal Covers (2 Covers Per Kit). Field installed primary and secondary IEC Touch Proof Cover Kit.
Control Transformer Accessories - Secondary Fuse Kit 3

SFK3

Control Transformer Accessories - Secondary Fuse Kit 3

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.