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Mersen STXH120P07 - Mersen Surge-Trap STXH120P07: Type 1 SPD for 120/240VAC split-phase. Features TPMOV® technology. UL Listed, UL1449 5th Edition compliant. Compact for AC disconnects/HVAC. NEMA 4X enclosure. LED status. Fits 1/2" knockouts, 18" leads. 3 modes protection (L-N, L-L). 3-year warranty. Approvals: UL 1449 4th Ed. (Type 1), CSA C22.2 (Type 1), IEEE C62.41.1/2, C62.45, UL96A Lightning Protection, RoHS.
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Mersen STXH120P07 Mersen Surge-Trap STXH120P07: Type 1 SPD for 120/240VAC split-phase. Features TPMOV®…

Alternate Item Number: STXH120P07

UPC: 782001512354


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Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

Protect your critical electrical systems with the Mersen Surge-Trap STXH120P07, a UL Type 1 Surge Protective Device (SPD) specifically designed for 120/240VAC split-phase applications. Engineered with advanced TPMOV® technology, this device offers robust surge suppression to safeguard sensitive equipment from transient voltage events. The STXH120P07 is UL Listed and fully compliant with UL1449 5th Edition standards, ensuring reliable performance and adherence to the latest safety regulations. Its compact design makes it ideal for installation in tight spaces, such as AC disconnects and HVAC units. The durable NEMA 4X enclosure provides superior protection against environmental factors, including dust and water ingress. An integrated LED status indicator offers at-a-glance confirmation of the SPD's operational status. Installation is straightforward, with the unit designed to fit 1/2" knockouts and featuring 18" leads for flexible wiring. The STXH120P07 provides comprehensive 3-mode protection, covering Line-Neutral (L-N) and Line-Line (L-L) fault conditions. Backed by a 3-year warranty, this SPD also holds numerous industry approvals, including UL 1449 4th Ed. (Type 1), CSA C22.2 (Type 1), IEEE C62.41.1/2, C62.45, UL96A Lightning Protection, and RoHS compliance. Manufacturer SKU: STXH120P07. Country of Origin: US. UNSPSC Code: 39121610.
  • UL Type 1 Surge Protective Device (SPD) for 120/240VAC split-phase systems
  • Features advanced TPMOV® technology for reliable surge suppression
  • UL Listed and UL1449 5th Edition compliant
  • Compact NEMA 4X enclosure suitable for AC disconnects and HVAC units
  • 3-mode protection (L-N, L-L) with LED status indicator

Specifications

Application
Residential Panels HVAC systems Pool and Spa equipment
Application
Any 120/240VAC split phase application HVAC applications Direct mounting to air condition disconnect switches
Connection
Pre-wired
Frequency Rating
50/60 HZ
Material
Polycarbonate
Mounting
Panel Mount
Operating Temperature, Maximum
185 F
Operating Temperature, Maximum
85 C
Operating Temperature, Minimum
-40 F
Operating Temperature, Minimum
-40 C
Phase
1
Series
STXH
Size
3.2 x 1.85 x 3.22;81.28 x 46.99 x 81.788 in;mm
Special Features
Mersen TPMOV Technology – does not require additional overcurrent protection Compact footprint for seamless integration with AC Disconnect Switches NEMA 4X enclosure for outdoor or indoor use Fits 1/2" knockouts with 18" leads for easy installation Up to 3 Modes of Protection (L-N, L-L, and L-G) Bright LED status indicator, visible from side profile through clear cover 3-year manufacturer’s warranty, plus up to 25k connected equipment warranty (For details see Warranty Statement)
Standard
ANSI/UL 1449 5th Edition, Type 1 SPD, File E210793 CSA C22.2, Type 1 SPD ANSI/IEEE C62.41.1, C62.41.2, C62.45 UL96A Lightning Protection RoHS Compliant
Type
NEMA UL CSA TYPE 1
Type of Indicators
LED
UL SPD Type
Type 1
Voltage Rating
120/240 Vac
Package Dimensions (L x W x H)
3.2 in x 1.85 in x 3.22 in
Package Dimensions (L x W x H)
81.28 mm x 46.99 mm x 81.788 mm
Package Weight (Imperial)
0.800 lb
Package Weight (Metric)
0.363 kg
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DIN rail is a universal mounting option for electrical and industrial control products such as circuit breakers electrical supplies terminal blocks and more. The rail system is used to stabilize a wide variety of devices and products. Ordering pre-cut DIN rail helps increase productivity and decrease jobsite clutter. On-site Flexibility Streamline custom cuts DIN rail to any length so it is ready to use when it arrives on the jobsite. Additionally DIN rail can be easily removed if relocation is necessary. Features of Custom DIN Rail from Streamline - All cut DIN rail from Streamline is galvanized steel made to eliminate rusting. Streamline ensures that all custom DIN rail orders are: De-burred Custom Length Any quantity 1-1000+ Quick turnaround (typically 2 weeks or less from receipt of order) This mechanical support structure is a must for all electrical parts solutions big or small. DIN rail allows for mounting hardware easily and quickly. These durable and versatile rails make the perfect solution for all mounting applications. Save space time and money with these cost-effective mounting solutions. Order your custom cut DIN rail today!
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How to Install the STXH120P07 Surge Protective Device (SPD)

Installation guide for mounting and wiring the STXH120P07 Surge Protective Device (SPD).

Estimated time: 45m

Tools needed:

Screwdriver, Wire strippers

Supplies needed:

Mounting screws, Terminal connectors, Watertight fittings (for outdoor applications)

  1. Verify System Compatibility

    Confirm that the system voltage and configuration match the SPD's voltage and configuration. Refer to the product's nameplate or datasheet for specific values.

  2. De-energize Equipment

    Turn off all power supplying the equipment. Verify that the equipment and all power sources are de-energized before proceeding. Follow safe electrical work practices and use appropriate PPE.

  3. Determine Mounting Location

    Select a mounting location for the SPD. It should be as close to the equipment as possible, with leads kept straight and short. If using a circuit breaker, identify its location (a 30A breaker is recommended). Position the SPD so the LED status indicator is visible.

  4. Mount the SPD

    Mount the STXH120P07 Surge Protective Device in the determined location. For outdoor applications, ensure watertight fittings are used to maintain the NEMA 4X rating.

  5. Make Electrical Connections

    Make the electrical connections to the SPD. For optimal performance, trim the leads to the shortest possible length, avoiding loops, coils, or sharp bends. Connect the SPD in parallel. Refer to the wiring diagram and ensure proper grounding (XON-G bonding at the upstream transformer).

  6. Energize and Verify Operation

    Energize the system and confirm the proper operation of the green LED status indicator. A green LED indicates the unit is functioning correctly. If the LED is off, the unit may be damaged, the circuit may be de-energized, or the SPD leads may be disconnected.

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.