Mersen ST230TT3 - 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. 230 Volts TT3 system type .
Mersen

ST230TT3

Alternate Item Number: 782001436780

UPC: 782001436780

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Overview

The Mersen Surge-Trap® ST230TT3 is a no-fuse, fail-safe surge protective device (SPD) designed for industrial low-voltage applications requiring robust transient overvoltage protection. This UL 1449 5th Edition compliant device features Mersen’s patented TPMOV® technology, eliminating the need for additional overcurrent protection devices. The ST230TT3 is rated for 230V TT3 systems and delivers a nominal discharge current (In) of 10–20kA per phase, with a maximum surge current rating (Imax) of 50kA and a short-circuit current rating (SCCR) of 200kA, making it suitable for demanding industrial control panels, water treatment facilities, smart grid applications, and traffic/ITS systems. Key features include a compact DIN-rail mountable design with reversible chassis for top or bottom cable entry, a visual status indicator (green = functional, red = replace), and an optional remote indicator with Form C dry contacts for critical control circuit monitoring. The device operates across a wide temperature range (-40°C to +85°C) and supports wire ranges from 4–14AWG (2.5mm²–25mm²) with a torque rating of 4.0 Nm. Its IP20 finger-safe design and UL94 V0 flammability rating ensure safety in harsh environments. The ST230TT3 also includes replaceable modules with mechanical coding to prevent installation errors and comes with a 5-year warranty. Approvals include ANSI/UL 1449 5th Edition (Open Type 1 SPD Listed, File E210793), ANSI/IEEE C62.41.1, C62.41.2, C62.45, and RoHS compliance. The device’s response time is less than 1 nanosecond per phase, providing near-instantaneous protection against transient events. Ideal for retrofitting into existing panels or new installations, the ST230TT3 combines reliability, ease of maintenance, and compliance with global standards.
  • No-fuse, fail-safe design with Mersen TPMOV® technology
  • UL 1449 5th Edition compliant, Open Type 1 SPD Listed
  • 50kA surge current rating (Imax), 200kA short-circuit rating (SCCR)
  • Visual (green/red) and optional remote Form C dry contact indicators
  • DIN-rail mountable, IP20 finger-safe, supports 4–14AWG wires

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
Mounting Type
DIN-Rail
Series
Surge-Trap
Short Circuit Rating
200 kA
Short-Circuit Rating
200 kA
Size
Small footprint
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
230 VAC
Package Dimensions (L x W x H)
3.58 IN x 2.8 IN x 2.7 IN
Package Dimensions (L x W x H)
9.0932 cm x 7.112 cm x 6.858 cm
Package Weight (Imperial)
1.100 L
Package Weight (Metric)
0.499 kg
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
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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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CESUM3-C15

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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.