Mersen STT4X4803PDG - Mersen's Surge-Trap® Type 1 SPD is a fail-safe and economical solution for applications that require a NEMA-style SPD. It is UL 1449 Third Edition approved and offers a wide range of voltage configurations to meet all needs in its class. The Surge-Trap Type 1 SPD features Mersen's patented TPMOV® technology eliminating the need for additional overcurrent protection, thus providing substantial cost savings. 480 Volts 3P Delta system type nema 4X .
Mersen

STT4X4803PDG

Alternate Item Number: 782001445133

UPC: 782001445133

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Overview

The Mersen Surge-Trap Type 1 SPD (SKU: STT4X4803PDG) is a UL 1449 Third Edition approved surge protection device designed for 480V, 3-Phase Delta systems. This Type 1 SPD features Mersen’s patented TPMOV® technology, which integrates thermal disconnect and arc-containment capabilities, eliminating the need for external overcurrent protection devices such as fuses or circuit breakers. This innovation simplifies installation, reduces labor costs, and minimizes panel space while ensuring system safety. Housed in a rugged NEMA 4X enclosure, the STT4X4803PDG is built to withstand harsh environments, including those with dust, dirt, moisture, and corrosive elements. The NEMA 4X rating ensures superior protection against environmental ingress, making it ideal for washdown areas, industrial automation, manufacturing facilities, water treatment plants, and commercial buildings with critical power needs. Key specifications include a nominal discharge current rating of 20kA, a surge capacity of 300kA per phase, and a short-circuit current rating (SCCR) of 200kA. The device operates at 50/60 Hz and supports system voltages from 240V to 480V AC. With a response time of less than 1 nanosecond per phase, the STT4X4803PDG provides near-instantaneous protection against transient voltage surges caused by lightning strikes, utility switching, or internal load switching. Additional features include a bright LED status indicator (visible through the clear cover), a surge counter with reset, and optional accessories such as a disconnect switch, audible alarm, and dry contacts. The field-replaceable SPD module can be mounted in any orientation to optimize performance and reduce lead length. The device is backed by a 5-year manufacturer’s warranty and complies with ANSI/UL 1449 5th Edition, CSA C22.2, UL96A Lightning Protection, and RoHS standards.
  • UL 1449 Third Edition approved Type 1 SPD for 480V 3-Phase Delta systems
  • Patented TPMOV® technology eliminates need for external overcurrent protection
  • NEMA 4X enclosure for superior protection in harsh, washdown environments
  • Nominal discharge current rating: 20kA; Surge capacity: 300kA per phase
  • Short-circuit current rating (SCCR): 200kA; Response time <1 nanosecond per phase
  • LED status indicator, surge counter, and optional disconnect switch/alarm/dry contacts
  • Field-replaceable SPD module with 5-year manufacturer’s warranty
  • Compliant with ANSI/UL 1449 5th Edition, CSA C22.2, UL96A, and RoHS standards

Specifications

Application
AC distribution Power supplies Industrial Commercial Telecommunications Residential IT / Data centers
Brand Name
Mersen
Connection
Pre-wired With 16 (0.4m) 12 AWG Conductors
Mounting
Panel / Screw
Nema Rating
NEMA 4X
Poles
3P Delta
Series
STT
Short Circuit Rating
200 kA
Short-Circuit Rating
200 kA
Special Features
Compact design Easy to mount No additional overcurrent protection devices required 200kA Short circuit current rating (SCCR) UL 1449 Third Edition Type 1 Listed Nominal discharge current (In) of 20KA (10KA on select models) For indoor, NEMA 2 applications For outdoor, NEMA 4X applications Status LEDs Wire markers 2 year warranty
Standard
UL 1449 Third Edition Approved, File No E210793 Type 1 Listed for United States Type 2 Listed for Canada RoHS compliant ANSI/IEEE C62.41
Sub Brand
Surge-Trap®
Type
Surge-Trap Type 1 & 2
Type Of Indicators
LED
Voltage Rating
480 VAC
Package Dimensions (L x W x H)
8 IN x 6 IN x 4 IN
Package Dimensions (L x W x H)
20.32 cm x 15.24 cm x 10.16 cm
Package Weight (Imperial)
2.032 L
Package Weight (Metric)
0.922 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.