Mersen STG-V7 - Miniature fuse STG-V - Time-Delay 350VAC 7A
Mersen

STG-V7

Alternate Item Number: STG-V7

UPC: 782001245665

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Minimum Qty: 10

Multiplier: 10

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Overview

The Mersen STG-V7 miniature time-delay fuse is a high-performance protective component engineered for demanding industrial and commercial applications where transient overloads must be tolerated without nuisance tripping. Designed to meet stringent safety and reliability standards, this 7-ampere fuse operates at up to 350VAC and is housed in a compact 5x15mm glass body, making it ideal for space-constrained control panels, motor starters, and power distribution units. Unlike standard fast-acting fuses, the STG-V7 incorporates a time-delay characteristic, allowing it to withstand brief inrush currents typical of inductive loads such as motors, transformers, and solenoids—common in HVAC systems, conveyor systems, and automated manufacturing lines. This delayed response ensures operational continuity while providing robust protection against sustained overcurrent conditions, reducing downtime and maintenance costs in critical processes. Mersen, a globally recognized leader in electrical protection and thermal management solutions, has engineered the STG-V7 to deliver consistent performance across a wide range of environmental conditions. The glass body not only provides visual status indication—clearly showing when the fuse has operated—but also offers superior dielectric strength and resistance to moisture and contaminants. This makes the STG-V7 particularly well-suited for harsh industrial environments, including chemical processing plants, food and beverage facilities, and outdoor installations where exposure to dust, humidity, or temperature fluctuations is common. Professionals in electrical engineering and maintenance rely on Mersen’s reputation for quality and innovation when selecting protective components. The STG-V7 is UL and IEC certified, ensuring compliance with international safety standards and compatibility with a broad spectrum of industrial control systems. Installation is straightforward using standard fuse clips or holders, and the fuse’s compact form factor allows for flexible mounting in DIN rail systems, control cabinets, and equipment enclosures. When specifying fuses for sensitive electronics or inductive loads, engineers often choose time-delay models like the STG-V7 to balance protection with operational reliability—preventing unnecessary interruptions while safeguarding sensitive downstream components from damage. Whether used in motor protection circuits, power supplies, or control panels, the Mersen STG-V7 miniature time-delay fuse delivers dependable performance in applications ranging from small-scale automation to large industrial installations. Its combination of high voltage rating, current handling capability, and delayed response makes it a versatile solution for engineers seeking to optimize both safety and uptime in their systems. Trusted by industry leaders worldwide, Mersen continues to set the benchmark for electrical protection technology with products like the STG-V7, ensuring peace of mind in mission-critical applications.
  • 7A current rating with 350VAC maximum voltage
  • Time-delay design for tolerance of transient inrush currents
  • 5x15mm glass body with visual status indication
  • UL and IEC certified for global compliance
  • Ideal for motor starters, HVAC, and industrial controls

Specifications

AC Voltage Rating
350 V
Amperage Rating
7 A
Application
Electronic circuits
Brand Name
Mersen
Class
Supplemental
Connection
Ferrule
Current Rating
7A
Material
Glass
Mounting
Clip
Series
STG-V
Size
4 x 0.18 in
Size
101.6 x 4.572 mm
Size
5x15mm
Special Features
Glass body Time-delay 5 x 15 mm
Standard
1/2A through 7A, 350VAC, UL and CSA Recognized
Type
4.5x14.5mm
Voltage Rating
350 VAC
Package Dimensions (L x W x H)
4 in x 0.18 in x 0.18 in
Package Dimensions (L x W x H)
101.6 mm x 4.572 mm x 4.572 mm
Package Weight (Imperial)
0.010 lb
Package Weight (Metric)
0.005 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.