Mersen A550T1/2E-LTI - Mersen PT fuses are current-limiting fuses with high interrupting rating, used for the primary winding protection of potential transformer. They are small dimension ferrule type fuses and mount in standard clips. Current ratings are from 0.25A to 5A. 5500 Volts 0.5 Amps A550T-L series.
Mersen

A550T1/2E-LTI

Alternate Item Number: 782001375928

UPC: 782001375928

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Overview

The Mersen A550T1/2E-LTI is a specialized current-limiting fuse engineered for the critical primary winding protection of potential transformers (PTs). As a key component within Mersen's robust A550T-L series, this fuse offers a high interrupting rating, ensuring superior protection against damaging overcurrents and short circuits in demanding industrial electrical systems. Its design prioritizes reliability and performance where safeguarding sensitive transformer components is paramount. With a substantial voltage rating of 5500 V and a precise current rating of 0.5 A, the A550T1/2E-LTI is specifically tailored for applications involving high-voltage potential transformers. These transformers are vital for stepping down high voltages to measurable levels for metering, protection relays, and control circuits in power generation, transmission, and distribution networks. Protecting their primary windings from electrical faults is essential to prevent costly downtime and equipment damage. The A550T1/2E-LTI features a compact, ferrule-type construction, making it an ideal choice for installations where space is a consideration. This design facilitates easy mounting in standard fuse clips, simplifying the integration process for electrical engineers and maintenance technicians. The ferrule design ensures secure electrical contact and efficient heat dissipation, contributing to the fuse's overall longevity and operational stability. Key features and benefits of the Mersen A550T1/2E-LTI include: * **High Interrupting Rating:** Provides robust protection against severe fault currents, safeguarding connected equipment. * **Current-Limiting Design:** Effectively limits the magnitude and duration of fault currents, minimizing damage to transformer windings and other circuit components. * **Specific Potential Transformer Protection:** Optimized for the unique requirements of PT primary winding protection. * **5500V Voltage Rating:** Suitable for high-voltage industrial and utility applications. * **0.5A Current Rating:** Precisely matches the protection needs for specific PT configurations. * **Compact Ferrule Type:** Easy to install in standard clips, saving space and simplifying maintenance. * **Mersen Quality:** Manufactured by Mersen, a globally recognized leader in electrical protection and power management solutions, ensuring reliability and performance. Choosing the correct fuse is a critical step in ensuring the safety and operational integrity of any electrical system. The Mersen A550T1/2E-LTI fuse represents a commitment to quality and specialized design, offering peace of mind for professionals responsible for protecting high-value potential transformers. Its current-limiting capabilities and high voltage rating make it an indispensable component in substations, industrial plants, and any facility relying on accurate voltage measurement and control.
  • Mersen A550T1/2E-LTI current-limiting fuse
  • Designed for potential transformer primary winding protection
  • 5500 V voltage rating
  • 0.5 A current rating
  • Small dimension ferrule type with standard clip mounting

Specifications

Brand Name
Ferraz Shawmut
Package Dimensions (L x W x H)
9.54 IN x 1.59 IN x 1.59 IN
Package Dimensions (L x W x H)
24.2316 cm x 4.0386 cm x 4.0386 cm
Package Weight (Imperial)
0.500 L
Package Weight (Metric)
0.227 kg
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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.
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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.