Mersen GGU4 - 125VAC rated GGU fuses have midget fuse dimensions (1-1/2" x 13/32"). 20A and above have ceramic bodies, allowing use in higher ambient temperature conditions than other similar fuses. (Not for Branch Circuit Protection). 125 Volts 4 Amps .
Mersen

GGU4

Alternate Item Number: 782001765040

UPC: 782001765040


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Overview

The Mersen GGU4 is a fast-acting midget fuse rated at 125VAC and 4A, designed for precise overcurrent protection in compact industrial applications. Measuring 1-1/2" (38mm) in length and 13/32" (10mm) in diameter, this fuse fits standard midget fuse holders while offering superior performance in elevated ambient temperatures. Unlike glass-body fuses, the GGU4 features a ceramic body construction, enabling reliable operation in harsh industrial environments where temperatures exceed the limits of conventional fuses. Engineered for low-to-medium current circuits requiring fast response times, the GGU4 delivers an interrupting rating of 10kA, making it ideal for protecting sensitive electronics, motors, transformers, and control circuits. Its medium-lag characteristic ensures balanced protection without nuisance tripping in applications up to 30A and 125VAC. The fuse is UL Listed for 1-15A ratings and UL Recognized for higher current applications, ensuring compliance with industry standards. Compatible with Mersen’s UltraSafe™ fuse holders (1-30A), the GGU4 simplifies installation and maintenance with secure connections and easy status verification. Applications include automation systems, HVAC controls, telecommunication equipment, power supplies, and instrumentation systems where space constraints and thermal resilience are critical. The GGU4’s compact design and thermal stability reduce the risk of premature failure, minimizing downtime in mission-critical systems. Mersen, a global leader in electrical protection solutions, designs the GGU4 to meet rigorous UL and industry standards, providing engineers with a trusted component for critical protection circuits. Its 4A rating makes it suitable for circuits requiring precise current limiting, while the ceramic body extends operational range beyond standard glass fuses. For professionals specifying fuses for industrial applications, the GGU4 offers a balance of compact design, thermal resilience, and reliable protection.
  • 125VAC rated, 4A fast-acting fuse with midget dimensions (1-1/2" x 13/32")
  • Ceramic body construction for superior performance in elevated ambient temperatures
  • Interrupting rating of 10kA for reliable protection in industrial applications
  • UL Listed (1-15A) and UL Recognized (20-30A) for compliance with industry standards
  • Compatible with Mersen UltraSafe™ fuse holders (1-30A) for secure installation and easy status verification

Specifications

Amperage Rating
4 A
Application
General Purpose 125VAC Circuits Supplemental Protection
Brand Name
Ferraz Shawmut
Class
Midget
Connection
Ferrule
Current Rating
4 A
Interrupt Rating
10 kA
Material
Ceramic
Mounting
Clip
Series
GGU
Size
1-1/2" x 13/32"
Special Features
Glass body on 3-15A makes status of fusible element clearly visible Ceramic body on 20-30A allows use in higher temperature applications Medium Lag for protection of circuits up to 30A and 125VAC Can be used with UltraSafe Fuseholders
Standard
UL Listed to Standard 248-14 (3-15A)
Type
Supplemental Protection
Voltage Rating
125 VAC
Package Dimensions (L x W x H)
1.5 IN x 0.406 IN x 0.406 IN
Package Dimensions (L x W x H)
3.81 cm x 10.3124 mm x 10.3124 mm
Package Weight (Imperial)
0.012 L
Package Weight (Metric)
0.005 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
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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.