Mersen A550T1E-STI - 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-S series.
Mersen

A550T1E-STI

Alternate Item Number: 782001375904

UPC: 782001375904

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Overview

The Mersen A550T1E-STI, part of the robust A550T-S series, is a high-performance, current-limiting fuse meticulously engineered for the critical primary winding protection of potential transformers (PTs). Designed to safeguard sensitive instrumentation and control circuits, this fuse offers an exceptional interrupting rating, ensuring rapid and reliable disconnection under fault conditions. Its compact ferrule-type construction allows for straightforward installation in standard fuse clips, simplifying maintenance and reducing downtime in demanding industrial environments. With a substantial voltage rating of 5500 Volts and a precise current rating of 1 Amp, the A550T1E-STI is specifically tailored to protect the primary side of potential transformers from damaging overcurrents and short circuits. Potential transformers are vital components in power systems, providing a scaled-down representation of high voltages for measurement, metering, and protection relays. Protecting their primary windings is paramount to maintaining the integrity and accuracy of these systems. Mersen, a globally recognized leader in electrical protection solutions, leverages its extensive expertise to deliver fuses that meet stringent industry standards for performance and reliability. Key features of the Mersen A550T1E-STI include: * **High Interrupting Rating:** Provides superior protection against severe fault currents, preventing catastrophic damage to the potential transformer and associated equipment. * **Current-Limiting Design:** Rapidly limits fault current to a value well below the potential short-circuit current, minimizing energy let-through and reducing thermal and mechanical stress. * **Compact Ferrule Type:** Small dimensions and standard ferrule design ensure compatibility with widely available fuse holders and clips, facilitating easy integration into existing panels and switchgear. * **5500V Voltage Rating:** Suitable for high-voltage applications commonly found in utility substations, industrial power distribution, and generation facilities. * **1A Current Rating:** Precisely matches the protection requirements for many potential transformer primary circuits, offering optimal sensitivity to overcurrents. Choosing the correct fuse for potential transformer protection is a critical engineering decision. The A550T1E-STI from Mersen offers peace of mind, knowing that your valuable equipment is shielded by a fuse designed for uncompromising performance. Its application extends across various sectors, including power generation, transmission and distribution, heavy industry, and any facility relying on accurate voltage monitoring and control. Trust Mersen's commitment to quality and innovation for your essential electrical protection needs. The SKU A550T1E-STI signifies a specific configuration within Mersen's comprehensive range of high-voltage fuses, ensuring you receive a product precisely suited for its intended purpose.
  • Current-limiting fuse for potential transformer primary winding protection
  • High interrupting rating for superior fault protection
  • Compact ferrule type for easy installation in standard clips
  • Rated for 5500 Volts and 1 Ampere
  • Reliable performance from industry leader Mersen

Specifications

Brand Name
Ferraz Shawmut
Connection Type
Ferrule type, standard clip mount
Connection Type
Ferrule type, mounts in standard clips
Current Rating
1 A
Mounting Type
Standard clip mount
Mounting Type
Standard fuse clips
Series
A550T-S
Size
Small dimension ferrule type
Voltage Rating
5500 V
Package Dimensions (L x W x H)
7.4 IN x 1.59 IN x 1.59 IN
Package Dimensions (L x W x H)
18.796 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.

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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.
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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.