Mersen A550T1E-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 1 Amps A550T-L series.
Mersen

A550T1E-LTI

Alternate Item Number: 782001375935

UPC: 782001375935

Contact for Pricing

Overview

The Mersen A550T1E-LTI is a current-limiting fuse with a high interrupting rating, specifically designed for the primary winding protection of potential transformers (PTs). Manufactured by Mersen (SKU: A550T1E-LTI), this ferrule-type fuse offers robust protection for demanding industrial and utility applications. Its design prioritizes superior interrupting capabilities, ensuring rapid and safe circuit interruption during faults to safeguard sensitive PT equipment. With a voltage rating of 5500 Volts and a precise current rating of 1 Ampere, the A550T1E-LTI is tailored for high-voltage potential transformer circuits where accurate and dependable protection is paramount. The fuse's small-dimension ferrule construction allows for compact installations and seamless integration into standard fuse clips, simplifying maintenance and replacement. Potential transformers are vital for metering, protection relays, and control circuits by providing a scaled-down representation of high system voltages. The primary winding is susceptible to overcurrents and short circuits. The Mersen A550T1E-LTI fuse acts as a crucial defense, its current-limiting characteristics minimizing let-through energy during a fault, protecting delicate windings from thermal and magnetic stress. This proactive protection is essential for maintaining the integrity of electrical grids. Key features and benefits: * **High Interrupting Rating:** Safely interrupts fault currents, preventing damage to potential transformers. * **Current-Limiting Design:** Minimizes peak let-through current for superior protection against short circuits. * **5500V Voltage Rating:** Suitable for high-voltage PT applications in utility and industrial power systems. * **1A Current Rating:** Precisely matched for PT primary winding protection. * **Compact Ferrule Type:** Facilitates easy installation in standard fuse clips. * **Mersen Quality:** Backed by Mersen's expertise in electrical protection devices.
  • Current-limiting fuse with high interrupting rating
  • Designed for primary winding protection of potential transformers (PTs)
  • 5500 Volts, 1 Ampere rating
  • Small dimension ferrule type for standard clip mounting
  • Manufactured by Mersen

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.