Mersen GGU Series Fast-Acting ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5.26
Mersen GGU Series Fast-Acting Midget Fuse, 125V

Mersen GGU Series Fast-Acting Midget Fuse, 125V

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Model: GGU3

In Stock (leaves warehouse same day if ordered before 3pm ET)

$5.26
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Mersen GGU Series Fast-Acting Midget Fuse, 125V

The Mersen GGU Series is a 125VAC-rated midget fuse line built to the standard 1-1/2" x 13/32" (10 mm x 38 mm) midget fuse dimensions, spanning an ampere range of 1A to 30A for supplemental overcurrent protection. Lower ampere ratings (1-15A) use a glass body so the status of the fusible element is clearly visible, while 20-30A ratings use a ceramic body that allows use in higher ambient temperature conditions than comparable fuses. With a medium lag, fast-acting speed characteristic and ferrule terminals in tin-plated copper, the GGU Series is UL Listed (1-15A) and UL Recognized (20-30A), though it is not intended for branch circuit protection.

Key Features

  • Midget Fuse Dimensions: 1-1/2" x 13/32" (10 mm x 38 mm) body size, common across the GGU Series line.
  • Ampere Range: Available from 1A through 30A to cover a broad range of 125VAC supplemental protection needs.
  • Durable Construction: Glass body on 1-15A ratings for clear visibility of the fusible element; ceramic body on 20-30A ratings for use in higher ambient temperature applications.
  • Connection Type: Ferrule terminals constructed of tin-plated copper for reliable clip-mount connections.
  • Speed/Characteristic: Medium lag, fast-acting response for protection of circuits up to 30A at 125VAC.
  • Interrupt Rating: 10 kA AC max I.R./breaking capacity (I1).
  • Holder Compatibility: Can be used with UltraSafe™ fuse holders (1-30A).

Certifications & Compliance

  • UL Listed, 1-15A
  • UL Recognized, 20-30A
  • Not rated for Branch Circuit Protection

Technical Specifications

  • Ampere Rating: 3 A
  • Rated Voltage AC (UL): 125 V
  • Speed/Characteristic: Fast-Acting
  • Fuse Class: Midget
  • Connection/Terminal Type: Ferrule
  • Connection/Terminal Material: Tin-Plated Copper
  • Body/Insulating Material: Ceramic
  • AC Max I.R./Breaking Capacity (I1): 10 kA
  • Mounting: Clip
  • Product Length: 1.5 in
  • Product Diameter: 0.41 in

Typical Applications

  • 125VAC General Purpose Circuits
  • Supplemental Overcurrent Protection
  • Panels and Equipment Requiring Midget Fuse Form Factor
  • Use with UltraSafe™ Fuse Holders
  • Higher Ambient Temperature Environments (20-30A ceramic-body ratings)

Why Mersen?

Mersen's GGU Series pairs UL-recognized/listed construction with practical design choices, glass bodies for visual fuse-status confirmation on lower ampere ratings, and ceramic bodies for higher-temperature durability on 20-30A ratings, so installers can select the right combination of visibility and thermal tolerance for the application. Ferrule terminals in tin-plated copper and a 10 kA interrupt rating support dependable, code-aware performance in professional electrical installations, and compatibility with UltraSafe™ fuse holders across the 1-30A range simplifies safe fuse handling and replacement in the field.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Fast-Acting Fuse
Series:
GGU
Voltage Rating:
125V
Connection Type:
Ferrule
Product Size:
1A - 30A
Listing:
UL Listed
Amperage Rating:
3A
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Mersen GGU3 – Frequently Asked Questions

1) Can I use a Mersen GGU midget fuse for branch circuit protection?
No. The GGU Series is built for supplemental overcurrent protection only and is not rated for branch circuit protection. If the fuse is sitting at the branch circuit, you need a branch-rated class fuse instead, such as a Class CC type like the Littelfuse CCMR Series time-delay fuse. The GGU belongs downstream, protecting components and equipment circuits at 125VAC.
2) Why do some Mersen GGU fuses have a glass body and others ceramic?
It splits by ampere rating. The 1A through 15A ratings use a glass body so you can see whether the element has blown without pulling the fuse. The 20A through 30A ratings use a ceramic body, which tolerates higher ambient temperatures than comparable fuses. If the panel or enclosure runs hot, the ceramic ratings are the ones built for it; if you want visual status checks during troubleshooting, stay in the glass range.
3) Is the Mersen GGU UL Listed across the whole amp range?
Not uniformly. The GGU Series is UL Listed from 1A through 15A and UL Recognized from 20A through 30A. If your submittal or inspector requires a UL Listed component, that limits you to the 15A and lower ratings.
4) What is the closest alternative to the Mersen GGU midget fuse if the circuit is 250V instead of 125V?
The Mersen GGU series is rated 125V AC, so it is not the fuse for a 250V circuit. The Littelfuse BLF series is a midget fast-acting fuse rated 250V with a laminated tube body, which keeps the same midget form factor and fast-acting characteristic while covering the higher voltage. Confirm the holder clips accept the same midget ferrule dimensions before swapping.
5) Can a Class CC fuse be used in place of a Mersen GGU midget fuse?
No, not interchangeably. The GGU is a midget fuse with ferrule terminals for clip mounting and is not rated for branch circuit protection. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A; Class CC fuses use a rejection-style end feature and holders, and time-delay response rather than the fast-acting characteristic of the GGU. Treat them as different classes, not substitutes.
6) For a metering circuit needing a small-amperage 600V fuse, is the Mersen GGU the right choice?
No. The GGU line is rated 125V AC and spans 1A to 30A. For energy metering voltage taps, the Square D PowerLogic Energy Meter Fuse Pack supplies 0.5A 600V fuses as a set of three, matching the per-phase arrangement meter installations use. Use the GGU for 125V supplemental overcurrent protection instead.
7) What is the interrupting rating on the Mersen GGU midget fuse?
10 kA AC maximum interrupting rating (breaking capacity I1) at 125VAC. That figure needs to meet or exceed the available fault current at the point of installation, so check it against your short circuit study before placing the fuse in equipment fed from a large transformer.
8) Is a fast-acting midget fuse the right choice for a motor or transformer load?
Usually not. The GGU is a fast-acting, medium lag characteristic, which suits general purpose 125VAC circuits and components that do not draw heavy inrush. Motors, transformers and other inductive loads pull a large starting current that will nuisance-blow a fast-acting fuse, so a time-delay fuse is the right type there, for example the Littelfuse CCMR Series time-delay fuse.
9) How does a Littelfuse AGU glass tube fuse differ from a Mersen GGU midget fuse?
The Mersen GGU is a midget-class fuse built to 1-1/2 in x 13/32 in dimensions with tin-plated copper ferrules, covering 1A to 30A at 125V AC. The Littelfuse AGU is an AG-series glass tube fuse supplied in a boxed package, a different AG body size family. Because midget clips are dimensioned for the 13/32 in diameter body, an AG-series fuse is a separate part, not a drop-in for a GGU holder.
10) Is a Littelfuse AGA5 glass fuse an equivalent to a Mersen GGU 5A fuse?
They are both glass-body fuses, and the Mersen GGU uses a glass body on its 1A to 15A ratings so the fusible element stays visible. The Littelfuse AGA5 is a 5A AGA-series glass fuse, which is a different body family from the midget 1-1/2 in x 13/32 in GGU. Match the holder: midget clips and AG-series clips are dimensioned differently, so verify the clip spacing before substituting.
11) Which midget fuse should I standardize on across a facility if I want one fuse body for both cool and warm panel locations?
The Mersen GGU series covers that in one line: glass bodies on the 1A to 15A ratings for visible element status, and ceramic bodies on the 20A to 30A ratings for higher ambient temperature conditions, all on the same 1-1/2 in x 13/32 in midget footprint with ferrule terminals and a 10 kA interrupt rating. If the panel runs at 250V, the Littelfuse BLF midget fast-acting line is the 250V-rated equivalent form factor.
12) Are the GGU fuse ferrules copper, and will they corrode in a damp panel?
The ferrule terminals are tin-plated copper. The tin plating is what keeps the contact surface from oxidizing in the clips, which matters if the equipment sits in a humid mechanical room or outdoor enclosure, since an oxidized ferrule runs hotter in the holder.
How fast can I get the Mersen GGU3 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Mersen GGU3 come with a warranty?
Absolutely. The Mersen GGU3 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Mersen GGU3?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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