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Mersen STXH120P07N - The Mersen Surge-Trap STXH120P07N is a UL Type 1 listed surge protective device (SPD) designed for 120/240VAC split phase applications. It fully complies with UL1449 5th Edition standards, ensuring robust protection for your electrical systems. Equipped with Mersen's proprietary TPMOV® technology, the STXH120P07N offers superior safety and reliability, making it a standout choice in its class. Its compact design facilitates easy installation, particularly in space-constrained environments. This SPD is ideally suited for protecting HVAC systems and can be directly attached to air conditioning disconnect switches, providing targeted surge suppression where it's most needed. SKU: STXH120P07N. Manufacturer: Mersen.
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Mersen STXH120P07N The Mersen Surge-Trap STXH120P07N is a UL Type 1 listed surge protective device (SPD)…

Alternate Item Number: STXH120P07N

UPC: 782001512361


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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

The Mersen Surge-Trap STXH120P07N is a UL Type 1 listed surge protective device (SPD) designed for 120/240VAC split-phase electrical systems. Fully compliant with UL1449 5th Edition standards, this SPD delivers robust protection against transient voltage spikes, ensuring the longevity and reliability of critical electrical equipment. The STXH120P07N features Mersen’s proprietary TPMOV® technology, which provides superior clamping performance and thermal stability, reducing the risk of catastrophic failure during surge events. Its compact design and 1/2" knockout mounting make it ideal for space-constrained environments, such as HVAC control panels and air conditioning disconnect switches. The device operates at 60 Hz with a 2-pole plus ground (2P+G) configuration, offering direct attachment compatibility for targeted surge suppression in HVAC systems. With 18" leads for flexible installation, the STXH120P07N is a reliable solution for protecting sensitive electronics in residential, commercial, and industrial applications. The STXH120P07N is specifically suited for protecting HVAC systems. Its direct attachment capability to air conditioning disconnect switches provides targeted surge suppression where it is most needed. The Mersen Surge-Trap STXH120P07N is a standout choice in its class due to its superior safety and reliability.
  • UL Type 1 listed and UL1449 5th Edition compliant for 120/240VAC split-phase systems
  • TPMOV® technology for superior surge clamping and thermal stability
  • Compact design with 1/2" knockout mounting for space-constrained installations
  • 2P+G configuration with 18" leads for flexible wiring options
  • Directly attaches to HVAC disconnect switches for targeted surge suppression

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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How to Install the STXH120P07N Surge Protective Device (SPD)

Installation guide for mounting and wiring the STXH120P07N 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 STXH120P07N 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.