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Mersen GGX 8AG Series Fast-Acting Glass Fuse
The Mersen GGX 8AG Series is a Fast-Acting glass tube fuse family built for reliable overcurrent protection in the standard 1/4" x 1" size, rated up to 250V. Constructed with a glass fuse body and ceramic insulating material, this series is designed for Clip mounting with Ferrule connection terminals, making it a dependable choice for control circuits, panels, and equipment that demand fast-acting protection. Coverage spans multiple current and voltage classes, from 1/2A through 2 1/2A at 250VAC (UL Listed) up to 8A through 30A at 32V AC (UL Recognized), giving specifiers a broad range of Fast-Acting GGX 8AG options for professional electrical work.
Key Features
- Trade Size: 1/4" x 1" standard 8AG glass fuse body for compact, space-saving installation in fuse blocks and holders.
- Durable Construction: Glass fuse body paired with ceramic insulating material for dependable, consistent performance.
- Fast-Acting Speed Characteristic: Opens quickly under overcurrent conditions to help protect connected circuits and equipment.
- Ferrule Connection Terminals: Ferrule-style terminals mate with Clip mounting fuse holders for secure, tool-free installation and replacement.
- Broad Voltage/Current Coverage: Available from 1/2A through 2 1/2A at 250VAC, 3A through 7A at 125V AC, and 8A through 30A at 32V AC to match a range of circuit protection needs.
- Country of Origin: Manufactured in Taiwan (TW).
Certifications & Compliance
- 1/2A through 2 1/2A, 250VAC, UL Listed
- 8A through 30A, 32V AC, UL Recognized
- 3A through 7A, 125V AC, UL Recognized
Technical Specifications
- Product Line: GGX 8AG - Fast-Acting
- Mounting: Clip
- Connection Terminal Type: Ferrule
- Body Insulating Material: Ceramic
- Speed Characteristic: Fast-Acting
- Product Diameter: 0.25 in
- Country of Origin: Taiwan
Typical Applications
- Control Circuit and Panel Overcurrent Protection
- Industrial and Commercial Electrical Equipment
- Instrumentation and Low-Voltage Circuit Protection
- Replacement Fuse for OEM and Aftermarket Equipment
Why Mersen?
Mersen builds the GGX 8AG Series with a glass fuse body, ceramic insulating material, and Fast-Acting speed characteristic to deliver dependable, code-compliant circuit protection. With UL Listed and UL Recognized ratings across its current and voltage classes, this series is a trusted choice for electricians and technicians who need consistent, reliable overcurrent protection in professional installations.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Group:
- Circuit Protection
- Body/Insulating Material:
- Ceramic
- Product Diameter:
- 0.25 in
- Product Line:
- GGX 8AG - Fast-Acting
- Speed/Characteristic:
- Fast-Acting
- Connection Terminal Type:
- Ferrule
- Department:
- Electrical
- Product Type:
- Fast-Acting Fuse
- Product Subgroup:
- Fuses
Mersen GGX6 – Frequently Asked Questions
1) What size fuse is the Mersen GGX 8AG, and will it fit a standard 1/4 x 1 inch fuse holder?
The GGX 8AG is the standard 8AG glass tube size, 1/4 inch by 1 inch, with a stated product diameter of 0.25 in. It uses ferrule terminals and drops into clip-style fuse holders and fuse blocks built for 1/4 x 1 inch glass fuses, no tools needed to swap one out.
2) What voltage is the Mersen GGX fuse rated for, and is it UL Listed?
Voltage rating depends on the amp rating. The 1/2A through 2-1/2A ratings are 250VAC and UL Listed. The 3A through 7A ratings are 125V AC and UL Recognized, and 8A through 30A are 32V AC, UL Recognized. So the 1/2A and 1A are your 250V UL Listed options, while the 3A and 6A are 125V UL Recognized parts. On a 250V control circuit that matters.
3) Is the GGX a fast-acting or time-delay fuse, and which should I use on a motor load?
GGX 8AG is fast-acting. It opens quickly on overcurrent, which suits control circuits, instrumentation, panels and electronic equipment where you want the fuse gone before the load is damaged. It is the wrong choice where you need to ride through a motor inrush or transformer magnetizing current; for that, a time-delay fuse such as the Littelfuse CCMR Series Class CC time-delay is the type to look at.
4) Can I replace an existing 3AG glass fuse with a Mersen GGX?
No. 8AG and 3AG are different body lengths. The GGX is the 1/4 x 1 inch 8AG size, so it needs a holder or clip set spaced for that length. If your holder takes a 1/4 x 1-1/4 inch fuse, this is not the part.
5) I need a 5A glass fuse and the Mersen GGX amperages offered are 1/2A, 1A, 3A and 6A. What should I use?
The Mersen GGX 8AG ferrule glass fuses cover 1/2A, 1A, 3A and 6A. For a 5A glass fuse, the Littelfuse AGA5 in the AGA series is a 5A glass fuse. Confirm the holder size and voltage rating on the equipment before substituting, since AG series designations cover more than one body length.
6) Is the Mersen GGX a substitute for a Class CC time-delay fuse like the CCMR040?
No. The Mersen GGX 8AG is a fast-acting glass tube fuse in the small 1/4 inch by 1 inch size used for control circuits, panels and instrumentation. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Class CC fuses use a rejection-style mounting and a time-delay curve suited to motor and transformer inrush; a fast-acting GGX will not carry that inrush and does not fit a Class CC rejection holder. Match the fuse class called out on the equipment nameplate.
7) What other glass tube fuses could I use instead of the Mersen GGX?
Within glass tube fuses, the Littelfuse AGU Series and the Littelfuse AGA5 (5A, AGA Series) are the closest alternatives we carry. If your holder is a midget block rather than a glass fuse clip, the Littelfuse BLF Series is a 250V midget fast-acting fuse in a laminated tube instead of glass. Match the physical size of the holder first, then the amp and voltage rating.
8) For replacing the fuses in a PowerLogic energy meter, do I order the Mersen GGX?
No. Square D sells a PowerLogic energy meter fuse pack, a set of three rated 0.5A at 600V, for that application. The Mersen GGX 8AG glass fuses are rated up to 250V, so the 600V metering fuse is the correct part for a PowerLogic meter. Use the GGX for control circuits, panels and low-voltage instrumentation within its voltage classes.
9) What is the GGX fuse body made of?
The tube is glass so you can see whether the element has blown without pulling it, and the insulating material is ceramic. The glass body is a practical advantage on panel troubleshooting, where a quick visual check beats meter work on every fuse in the block.
10) Where is the Mersen GGX fuse manufactured?
Mersen manufactures the GGX 8AG Series in Taiwan. Institutional and government buyers tracking country of origin on purchase orders should note that for their documentation.
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Does the Mersen GGX6 come with a warranty?
Absolutely. The Mersen GGX6 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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