Mersen ST208SPGM - 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. 120/208 Volts split phase system type with microswitch .
Mersen

ST208SPGM

Alternate Item Number: 782001361440

UPC: 782001361440

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Specification Sheet

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Multiplier: 2

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Overview

Protect your critical industrial equipment from damaging voltage transients with the Mersen Surge-Trap® ST208SPGM Surge Protective Device (SPD). Engineered for demanding environments, this advanced SPD offers robust overvoltage protection without the need for additional fuses or external components. Its modular design and DIN-rail mountability ensure seamless integration into existing control panels and electrical systems, making it an ideal solution for space-constrained applications. The ST208SPGM is built upon Mersen's proprietary TPMOV® technology, a patented surge suppression innovation that delivers superior performance and reliability. This technology ensures that the device operates fail-safely, providing continuous protection even in the event of internal component failure. The integrated visual indicator offers immediate status feedback, allowing for quick assessment of the SPD's operational health. For enhanced system monitoring, a microswitch connection is included, enabling remote status reporting to critical control circuits. This feature is invaluable for applications where immediate notification of a surge event or device status is paramount for maintaining operational continuity. Designed for 120/208 Volt split-phase systems, the Surge-Trap ST208SPGM meets the stringent requirements of UL 1449 Third Edition, guaranteeing compliance with industry safety and performance standards. This certification assures users that the device has undergone rigorous testing and meets the highest benchmarks for surge protection. The compact footprint of the ST208SPGM further enhances its appeal, allowing for efficient use of panel space without compromising on protective capabilities. Key Features and Benefits: * **Advanced TPMOV® Technology:** Mersen's patented technology provides superior surge suppression and a fail-safe design. * **No-Fuse Design:** Eliminates the need for additional protection devices, simplifying installation and maintenance. * **UL 1449 Third Edition Compliant:** Meets rigorous industry safety and performance standards. * **Modular and DIN-rail Mountable:** Facilitates easy integration into industrial control panels and electrical enclosures. * **Visual Indicator:** Provides clear, at-a-glance status of the surge protective device. * **Microswitch Connection:** Enables remote status monitoring for critical control circuits. * **Compact Footprint:** Ideal for space-constrained applications. * **120/208V Split-Phase System Compatibility:** Specifically designed for common industrial voltage configurations. Applications for the Mersen Surge-Trap ST208SPGM include protecting sensitive electronics, motor control centers, programmable logic controllers (PLCs), variable frequency drives (VFDs), and other critical infrastructure components in manufacturing plants, data centers, and commercial facilities. By investing in reliable surge protection like the Surge-Trap, businesses can significantly reduce the risk of costly downtime, equipment damage, and data loss, ensuring consistent and efficient operations. Mersen's reputation for quality and innovation in power quality solutions makes the ST208SPGM a trusted choice for safeguarding industrial electrical systems.
  • Mersen Surge-Trap ST208SPGM surge protective device
  • 120/208 Volt split-phase system compatibility
  • UL 1449 Third Edition compliant
  • DIN-rail mountable with modular design
  • Features Mersen's patented TPMOV® technology for fail-safe protection
  • Includes visual indicator and microswitch for remote status monitoring

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
Mounting
DIN-rail
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
Type Of Indicators
Microswitch
Voltage Rating
120 VAC
Package Dimensions (L x W x H)
3.58 IN x 1.4 IN x 2.7 IN
Package Dimensions (L x W x H)
9.0932 cm x 3.556 cm x 6.858 cm
Package Weight (Imperial)
0.550 L
Package Weight (Metric)
0.249 kg
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
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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.