Mersen D221309 - High performance square body fuse-link Protistor® Size 91 aR 1500VAC IEC 250A With Striker DIN 140 Blades URH
Mersen

D221309

Alternate Item Number: PC91UH15C250D4A

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Overview

The Mersen Protistor® Size 91 aR 1500VAC fuse-link (SKU: D221309) delivers precise semiconductor protection with a 250A rated current, 1500VAC (IEC) / 1300VAC (UL) voltage rating, and 126kA breaking capacity. Engineered for high-speed response, this square body fuse-link features pure silver die-cut elements embedded in solidified sand to control arcing, ensuring low I²t and high breaking performance. The 1250VAC rated voltage meets IEC standards, while the 1300VAC rating aligns with UL requirements, providing global compatibility. With a pre-arcing I²t of 12 kA²s and clearing I²t of 96 kA²s, this fuse-link offers exceptional protection for SCRs, diodes, thyristors, GTOs, and IGBTs in power conversion equipment. All contact surfaces are silver-plated for low resistance, and non-magnetic hardware ensures long-term reliability. The integrated low-voltage trip-indicator activates a field-mountable microswitch for remote signaling, enabling real-time monitoring without interrupting service. Designed for DIN 140 blades, this fuse-link supports flexible mounting styles and integrates seamlessly into industrial power systems. Ideal for applications requiring 1500VAC protection, this Mersen Protistor® fuse-link combines durability, precision, and compliance with IEC and UL standards.
  • 250A rated current with 1500VAC (IEC) / 1300VAC (UL) voltage rating
  • 126kA breaking capacity and low I²t for precise semiconductor protection
  • Pure silver die-cut elements embedded in solidified sand for controlled arcing
  • Silver-plated contacts and non-magnetic hardware for long-term reliability
  • Low-voltage trip-indicator for remote signaling via field-mountable microswitch

Specifications

AC Voltage Rating
1500 V
Amperage Rating
250 A
Application
Protection of rectifiers, inverters, DC drivers, UPS systems, reduces voltage motor starters and other equipment in globally accepted aplications.
Brand Name
Mersen
Case
Ceramic
Connection
DIN Type Blades
Connection Type
DIN 140 Blades
Current Rating
250 A
Material
Silver, Sand
Mounting
Bolted
Mounting Type
Square body fuse-link
Series
Protistor® PSC
Size
6.54 x 2.01 x 2.44 in
Size
166 x 51 x 62 mm
Size
Size 91
Special Features
Extremely fast acting Current limiting Very low l²t Worldwide acceptability Superior cycling ability Choice of mounting styles Broad range of ampere rating
Standard
IEC 60269.4
Sub Brand
Protistor®
Type
High performance square body fuse-links AC protection
Type Of Indicators
Striker
Voltage Rating
1500 VAC
Voltage Rating
1500 V
Wattage
47 W
Package Dimensions (L x W x H)
6.54 in x 2.01 in x 2.44 in
Package Dimensions (L x W x H)
166 mm x 51 mm x 62 mm
Package Weight (Imperial)
1.764 lb
Package Weight (Metric)
0.800 kg
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Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

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Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

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Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.