Mersen STXT480S20 - The Mersen STXT480S20 is a Type 1 Surge-Trap (SKU: STXT480S20) featuring built-in EMI/RFI filtering and LED indication on each phase. It includes optional remote indication and delivers surge capacities up to 200kA. The unit uses Mersen’s TPMOV® technology for enhanced safety and does not require additional overcurrent protection. Designed for installation flexibility, it can be mounted on the line or load side, making it suitable for service entrance, distribution, and branch panels. Made in the US.
Mersen

STXT480S20

Alternate Item Number: STXT480S20

UPC: 782001504090


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Overview

The Mersen STXT480S20 Type 1 Surge-Trap, identified by SKU STXT480S20, offers robust surge protection capabilities. This unit is engineered to handle surge capacities of up to 200kA, making it a powerful solution for safeguarding electrical systems. Its design incorporates Mersen’s proprietary TPMOV® technology, which significantly enhances safety and eliminates the need for supplementary overcurrent protection devices. This integration simplifies installation and reduces overall system complexity and cost. The STXT480S20 is designed for versatile installation, allowing it to be mounted on either the line or load side of electrical panels. This flexibility makes it an ideal choice for a variety of applications, including service entrance panels, distribution panels, and branch panels. Furthermore, the unit features integrated EMI/RFI filtering, which effectively mitigates electromagnetic interference and radio-frequency interference, thereby protecting sensitive electronic equipment from disruptive electrical noise. For immediate visual status feedback, each phase of the STXT480S20 is equipped with LED indication. Additionally, the unit offers the option of remote indication, which is particularly beneficial for larger installations where centralized monitoring of surge protection status is required. The STXT480S20 is manufactured in the US, underscoring a commitment to domestic production and quality. Its Type 1 rating signifies its suitability for indoor installations, providing reliable protection against transient voltage events and surges in various electrical environments.
  • 200kA surge capacity for robust protection against transient voltage spikes
  • Built-in EMI/RFI filtering reduces electrical noise interference
  • LED indication on each phase for real-time status monitoring
  • Optional remote indication for centralized monitoring in larger systems
  • NEMA Type 1 rated for indoor use; mounts on line or load side

Specifications

Application
Service entrance at low to medium risk exposure level Commercial and Industrial Distribution Panels or Control Branch Panels Any critical application that requires a high to medium level of protection
Color
Blue
Connection
Pre-wired
Connection Type
Screw Terminal
Current Rating
20 A
Frequency Rating
50/60 HZ
Material
Polycarbonate
Material
Poly
Material
TPMOV
Mounting
Panel or Wall Mount
Mounting Type
Line or Load Side
NEMA Rating
Type 1
Nema Rating
Type 4X
Operating Temperature, Maximum
185 F
Operating Temperature, Maximum
85 C
Operating Temperature, Minimum
-40 F
Operating Temperature, Minimum
-40 C
Phase
Split Phase
Poles
3P+G
Poles
3P
Series
STXT
Series
Surge-Trap
Size
7.4 x 7.08 x 3.68;187.96 x 179.832 x 93.472 in;mm
Size
Size 1
Special Features
Designed with industry leading Mersen TPMOV technology Standard features include LED phase loss indication and EMI/ RFI filter Up to -50dB from 10kHz to 100MHz Optional Form C Dry Contacts and audible alarm with silence button Mounting hub and mounting feet for installation flexibility Up to 10 Modes of Protection 10-year manufacturer’s warranty
Standard
ANSI/UL 1449 5th Edition, Type 1 SPD, File E210793 CSA C22.2, Type 1 SPD ANSI/IEEE C62.41.1, C62.41.2, C62.45 UL96A Lightning Protection RoHS Compliant
Type
NEMA UL CSA TYPE 1
Type of Indicators
LED
UL SPD Type
Type 1
Voltage Rating
480 VAC
Package Dimensions (L x W x H)
7.4 in x 7.08 in x 3.68 in
Package Dimensions (L x W x H)
187.96 mm x 179.832 mm x 93.472 mm
Package Weight (Imperial)
4.100 lb
Package Weight (Metric)
1.860 kg
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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.