Mersen ST4803PD - Surge-Trap® Surge Protective Device is a no-fuse surge suppressor. The Surge-Trap is a UL 1449 Third Edition compliant modular style surge protective device that is DIN-rail mountable featuring a fail-safe self-protected design, visual indicator and a small foot print. A remote indicator option provides status to critical control circuit. The Surge-Trap provides advanced overvoltage protection utilizing Mersen's patented TPMOV® technology without additional protection devices. 480 Volts 3P Delta system type .
Mersen

ST4803PD

Alternate Item Number: 782001361655

UPC: 782001361655

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Specification Sheet

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Overview

The Mersen Surge-Trap® ST4803PD represents a pinnacle of industrial surge protection, engineered to safeguard critical electrical systems from transient overvoltages. As a no-fuse surge suppressor, this device simplifies installation and maintenance while delivering robust protection. Its modular design, compliant with UL 1449 Third Edition standards, allows for seamless integration into existing control panels via DIN-rail mounting, making it an ideal solution for space-constrained environments. The ST4803PD is specifically designed for 480 Volts, 3-Phase Delta system configurations, a common setup in demanding industrial settings. Mersen's proprietary TPMOV® technology is at the core of the Surge-Trap's advanced performance. This patented technology ensures superior overvoltage suppression without the need for supplementary protection devices, reducing component count and system complexity. The fail-safe, self-protected design guarantees operational integrity, even under extreme surge conditions, providing peace of mind for facility managers and engineers. A clear visual indicator on the device offers immediate status feedback, allowing for quick assessment of the surge protector's health. For enhanced operational awareness and integration into SCADA or building management systems, an optional remote indicator is available, providing critical status updates to control rooms or maintenance stations. This surge protective device is crucial for protecting sensitive industrial equipment such as Programmable Logic Controllers (PLCs), variable frequency drives (VFDs), motor control centers (MCCs), and other electronic control systems that are susceptible to damage from lightning strikes, utility switching, and other transient events. By mitigating these surges, the Surge-Trap ST4803PD helps prevent costly downtime, equipment failure, and production losses. Its compact footprint and DIN-rail mountability make it exceptionally versatile for applications in manufacturing plants, data centers, water treatment facilities, and any industrial environment where reliable power quality is paramount. Key features and benefits of the Mersen Surge-Trap ST4803PD include: * **Advanced Overvoltage Protection:** Utilizes Mersen's patented TPMOV® technology for superior surge suppression. * **No-Fuse Design:** Simplifies installation and eliminates the need for replacement fuses. * **UL 1449 Third Edition Compliance:** Meets stringent industry safety and performance standards. * **DIN-Rail Mountable:** Compact, modular design for easy and efficient panel integration. * **Fail-Safe Self-Protected Design:** Ensures reliable operation and protection. * **Visual Status Indicator:** Provides clear, at-a-glance operational status. * **Optional Remote Indicator:** Enables remote monitoring and integration with control systems. * **System Compatibility:** Specifically designed for 480V, 3-Phase Delta systems. Choosing Mersen for your surge protection needs means investing in a legacy of innovation and reliability. The Surge-Trap ST4803PD is a testament to Mersen's commitment to providing high-quality, durable, and effective solutions for the most demanding industrial environments. Its robust construction and advanced technological features make it an indispensable component for maintaining the uptime and longevity of your critical electrical infrastructure.
  • Mersen Surge-Trap ST4803PD surge protective device
  • 480 Volts, 3-Phase Delta system compatibility
  • UL 1449 Third Edition compliant
  • No-fuse design with fail-safe self-protected operation
  • DIN-rail mountable with visual and optional remote indicator

Specifications

Application
AC/DC distribution Power supplies Industrial automation Telecommunications Motor controls and starter systems Programmable logic controller (PLC) applications Power transfer equipment HVAC applications AC drives UPS systems Security systems IT / Data centers Medical equipment
Brand Name
Mersen
Connection
Box
Connection Type
DIN-rail mount
Mounting
DIN-rail
Mounting Type
DIN-Rail
Poles
3P
Series
Surge-Trap
Short Circuit Rating
200 kA
Short-Circuit Rating
200 kA
Special Features
Easy installation or retrofit Din-rail mountable Fail-safe /self-protected design Remote indicator (optional) with 3 pin NO/NC contact IP20 finger-safe design Visual indicator Small foot print No additional overcurrent protection devices needed
Standard
UL 1449 Third Edition, File No E210793 Type 1 Component Assembly IEC 61643-1 ANSI/IEEE C62.41 CE RoHS compliant
Sub Brand
Surge-Trap®
Type
Surge-Trap® SPD
Voltage Rating
480 VAC
Package Dimensions (L x W x H)
4.88 IN x 2.88 IN x 2.75 IN
Package Dimensions (L x W x H)
12.3952 cm x 7.3152 cm x 6.985 cm
Package Weight (Imperial)
1.155 L
Package Weight (Metric)
0.524 kg
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This TX6A 10Gig Cat 6A STP Patch Cord is a 12-Meter, Int'l Grey cord constructed of 26 AWG, shielded, twisted pair, stranded, CM/LSZH cable and with high-performance modular plugs. Its tangle-free latch prevents snags and ensures a fast release, streamlining moves, adds, and changes. The slender strain relief boot provides easy access in high-density applications. Enabled with RapidID, the product has pre-installed barcodes for simple port mapping using RapidID software.
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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.