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Mersen GGA Time-Delay 5x20mm Glass Cartridge Fuse
The Mersen GGA Time-Delay Series is a 5mm x 20mm glass-body cartridge fuse line engineered for reliable overcurrent protection in electronic and electrical circuits. Built with a time-delay (slow-blow) speed characteristic, these fuses ride through momentary inrush current without nuisance opening while still protecting against sustained overloads. The GGA - Time-Delay line spans 4A and 5A fuses rated 125VAC along with 1/10A through 3A fuses rated up to 250VAC, and is UL Listed and CSA Certified for code-compliant circuit protection in control panels, instrumentation, and general electronic equipment. The glass body construction lets technicians visually confirm the fuse element and condition without removing the fuse from its holder, speeding up troubleshooting and maintenance in the field.
Key Features
- Trade Size: 5mm x 20mm glass body sized to fit standard 5x20mm fuse clips and holders for drop-in replacement.
- Durable Glass Construction: Glass Body Insulating Material allows visual inspection of the fuse element and condition without disassembly.
- Time-Delay Characteristic: Time-delay speed characteristic absorbs momentary inrush current while still protecting against sustained overloads, reducing nuisance fuse openings.
- Ampere Rating Range: 1/10A through 5A fuses available across the GGA - Time-Delay line for accurately matched circuit protection.
- Voltage Rating: 125VAC for the 4A and 5A versions, up to 250VAC for the 1/10A through 3A versions.
- Mounting & Termination: Clip mounting with Ferrule connection terminal type for a secure, low-resistance fit in standard fuse holders and clips.
- Country of Origin: Manufactured in China.
Certifications & Compliance
- UL Listed
- CSA Certified
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Electronic and Electrical Circuit Protection
- Control Panels and Instrumentation Circuits
- Small Appliance and Equipment Protection
- Panelboard and Low-Voltage Wiring Protection
- General-Purpose Overcurrent Protection
Why Mersen?
Mersen's GGA - Time-Delay fuses combine a glass body for easy visual inspection with UL Listed and CSA Certified performance, giving electrical professionals confidence in code-compliant circuit protection. The time-delay characteristic across the 1/10A through 5A range helps prevent nuisance fuse openings while safeguarding connected equipment from sustained overcurrent conditions, and the clip-mount, ferrule-terminal design ensures a secure, low-resistance connection for dependable performance in electronic and electrical applications.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Fuse
- Product Material:
- Glass
- Connection Type:
- Ferrule
- Amperage Rating:
- 1/10A - 5A
- Voltage Rating:
- 125V - 250V
- Listing:
- UL Listed
- Standards:
- UL-CSA
- Country of Origin:
- China
- Department:
- Electrical
- Product Group:
- Wiring Devices
Mersen GGA2 – Frequently Asked Questions
1) Will a Mersen GGA fuse fit standard 5x20mm fuse clips?
Yes. The GGA is a 5mm x 20mm glass-body cartridge with ferrule terminations, so it drops into standard 5x20mm clips and holders. Clip mounting with ferrule ends is the common metric panel-fuse format, which is what makes it a direct swap in control panel holders already carrying 5x20 fuses.
2) Is the Mersen GGA fuse slow-blow or fast-acting?
Slow-blow. The GGA line is a time-delay characteristic, so it rides through momentary inrush without opening and still clears a sustained overload. That is what you want on transformer primaries, motor-driven accessories, and switching power supplies inside a control panel. If your circuit has no inrush and you want the fastest possible clearing for semiconductor or instrument protection, a fast-acting fuse is the better match, such as the Littelfuse BLF Series midget fast-acting.
3) Is the Mersen GGA fuse UL Listed and CSA approved for panel work?
Both. The GGA glass cartridge fuse is UL Listed and CSA Certified, which is what an inspector or facility standard usually asks for on control panel and instrumentation circuit protection.
4) Can I use a Mersen GGA 5x20mm fuse in place of a Littelfuse AGA or AGU glass fuse?
Not interchangeably on size. The GGA is the metric 5x20mm body. The Littelfuse AGA Series and AGU Series are AG-format glass tube fuses, a different family of dimensions, and a fuse clip is sized to one body length. Match the physical size your holder was built for first, then match speed characteristic and voltage. If your holder is 5x20mm, the GGA is the fit; if it takes an AG-size glass tube, look at the Littelfuse AGA or AGU instead.
5) I need a time-delay fuse for a branch circuit disconnect, not a control circuit. Is the GGA the right fuse?
No. The GGA tops out at 5A and 250VAC, so it is a control, instrumentation, and electronic equipment fuse. For a branch circuit or motor disconnect you want a Class CC time-delay fuse in a rejection holder, for example the Littelfuse CCMR Series, which is offered up to 40A in the CCMR040. Different amp class, different holder, different job.
6) I need a time-delay fuse above 5 amps - what do I use instead of the Mersen GGA?
The Mersen GGA line covers 1/10A through 5A, so anything above that needs a different class of fuse. The Littelfuse CCMR040, from the CCMR Series, is a Class CC time-delay fuse rated 40A and keeps the time-delay characteristic for inrush loads while carrying a branch-circuit rating the small glass cartridge does not. Class CC fuses use a rejection-style holder rather than a 5x20mm clip, so the fuse block has to be changed out with it - this is a design decision at the panel, not a drop-in.
7) What is the closest glass fuse to the Mersen GGA 5A?
The Littelfuse AGA5, part of the AGA Series, is a 5A glass fuse and the nearest like-for-like to the Mersen GGA5, which is the 5A member of the Mersen GGA time-delay 5x20mm glass cartridge line. Both are glass-body fuses at the same 5A rating, so a maintenance tech restocking a control panel drawer can carry either as the 5A glass position. The Mersen GGA line is UL Listed and CSA Certified and uses clip mounting with ferrule terminals, so confirm the holder in the panel is a 5x20mm clip before dropping either one in.
8) Will a Mersen GGA fuse work as a replacement in a Square D PowerLogic energy meter?
No. The Square D PowerLogic energy meter fuse pack is a set of three fuses rated 0.5A at 600V, and the 600V rating is the reason - the Mersen GGA line tops out at 250VAC on the 1/10A through 3A ratings and 125VAC on the 4A and 5A. A metering circuit tapped off a 480V or 600V service needs the voltage rating the PowerLogic pack carries. Use the GGA where the circuit voltage is inside its rating, such as control panel and instrumentation circuits, and order the meter pack for the meter itself.
9) Which Mersen GGA part number do I order for a 2 amp or 5 amp fuse?
Order by the Mersen part number: GGA2 for the 2 amp and GGA5 for the 5 amp. Both are the same 5x20mm glass time-delay body, so the only thing changing between them is the ampere rating, and on the 5A the voltage rating drops to 125VAC.
10) Can a GGA fuse protect a metering circuit like a Square D PowerLogic meter?
Only if the meter's fuse spec matches. Metering CT and voltage sense circuits are typically fused very low and at higher voltage: the Square D PowerLogic energy meter fuse pack is 0.5A 600V. The GGA maxes out at 250VAC, so on a 600V-rated metering input it is not the right fuse. Use the fuse the meter manufacturer specifies. Where a meter or instrument runs at 250V or less and calls for a 5x20mm time-delay, the GGA covers 1/10A up through the range.
11) What is the difference between the Mersen GGA and the Littelfuse AGU glass tube fuse?
Both are glass-body fuses, which is why they get confused on a parts list. The Littelfuse AGU Series is an AG-format glass tube fuse supplied in a boxed package; the AG sizes are a separate dimensional family from the 5mm x 20mm body the Mersen GGA uses. The GGA is also specifically a time-delay design rated 125VAC at 4A and 5A and up to 250VAC from 1/10A through 3A. Match the holder dimension first - an AGU will not clip into a 5x20mm holder, and the two are not interchangeable on body size regardless of ampere rating.
12) Can I tell if a Mersen GGA fuse is blown without pulling it out?
Usually, yes. The body is glass, so the element is visible in the holder and a clearly ruptured or blackened element reads at a glance. That is the practical reason maintenance techs keep glass fuses on instrumentation panels. A hairline open still needs a meter, so treat the visual as a first check, not the final word.
13) Where are Mersen GGA fuses made?
The GGA time-delay glass cartridge fuses are manufactured in China. For public agency or institutional buyers working to a domestic sourcing requirement, that is the detail to check against your procurement spec before it goes on the PO.
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