Mersen ST240SPG - 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. 120/240 Volts split phase system type .
Mersen

ST240SPG

Alternate Item Number: ST240SPG

UPC: 782001361457


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Overview

The Mersen Surge-Trap® ST Series (SKU: ST240SPG) is a highly effective, no-fuse surge protective device (SPD) designed for 120/240 VAC split-phase systems. Featuring Mersen's patented TPMOV® technology, this modular SPD offers fail-safe, self-protected operation without the need for additional overcurrent protection devices. Its DIN-rail mountable design ensures easy installation and retrofit into industrial control panels, water treatment facilities, smart grid applications, and traffic/ITS systems. The ST Series boasts a high short circuit current rating (SCCR) of 200kA, making it suitable for demanding industrial environments. Key features include a visual indicator flag (Green = Functional, Red = Replace) for immediate status monitoring and an optional remote indicator with Form C dry contacts for status to critical control circuitry. The device is UL 1449 5th Edition approved (Open Type 1 SPD Listed, File E210793) and complies with ANSI/IEEE C62.41.1, C62.41.2, and C62.45 standards, as well as being RoHS compliant. Technical specifications include a maximum surge current rating (Imax) of 50kA, nominal discharge current (In) of 10-20kA (8x20 μs), and a response time of less than 1 nanosecond. It accommodates wire ranges from 4-14 AWG (2.5mm² – 25mm²) solid/stranded copper with a torque of 35.4 lbs-in (4.0 Nm). The IP20 finger-safe design and UL94 V0 flammability rating contribute to its safety. Operating and storage temperatures range from -40ºF (-40ºC) to +185ºF (+85ºC). Mersen provides a 5-year warranty for this robust surge protection solution.
  • No-fuse, fail-safe surge suppressor with Mersen's patented TPMOV® technology
  • DIN-rail mountable with a small footprint for easy installation
  • Visual indicator for functional status and optional remote indicator
  • High short circuit current rating (SCCR) of 200kA
  • UL 1449 5th Edition approved for reliable protection

Specifications

Application
Industrial Control Panels Water treatment AC Drives Smart grid & LV Metering Security Systems Traffic / ITS applications. Intended for use on a wide range of low voltage applications inside appropriate enclosures
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
Frequency Rating
50/60 HZ
Material
PET (Polyethelene Terphthalate)
Mounting
DIN Rail
Mounting
DIN-rail
Operating Temperature, Maximum
185 F
Operating Temperature, Maximum
85 C
Operating Temperature, Minimum
-40 F
Operating Temperature, Minimum
-40 C
Phase
Split Phase
Response Time
<25
Short Circuit Rating
200 kA
Short-Circuit Rating
200 kA
Size
3.58 x 1.4 x 2.7;90.932 x 35.56 x 68.58 in;mm
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
Special Features
Designed with industry leading Mersen TPMOV technology Easy installation Cost-effective protection Remote Indicator (optional) 2-year warranty
Standard
UL 1449 Third Edition, File No E210793 Type 1 Component Assembly IEC 61643-1 ANSI/IEEE C62.41 CE RoHS compliant
Standard
ANSI/UL 1449 5th Edition, Type 1 Component Assembly, File E210793 ANSI/IEEE C62.41.1, C62.41.2, C62.45 RoHS Compliant
Sub Brand
Surge-Trap®
Type
DIN-RAIL UL CSA TYPE 1
Type of Indicators
Visual Indicator
UL SPD Type
Type 1 Component Assembly
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
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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.