Mersen GFN Midget Time-Delay F...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$47.16
Mersen GFN Midget Time-Delay Fuse, 250VAC Ferrule

Mersen GFN Midget Time-Delay Fuse, 250VAC Ferrule

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Model: GFN10

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

$47.16
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Mersen GFN Midget Time-Delay Fuse, 250VAC Ferrule

The Mersen GFN Midget Time-Delay Fuse is a 250VAC, Ferrule-terminal fuse built with a built-in blown-fuse indicator that pops out at the end of the fuse to give visual confirmation when the fuse has operated. This GFN indicating fuse series is available in 34 ratings from 1/10A through 30A, and the indicator can also be used to trip a switch for remote signaling as well as visual indication. As a Time-Delay, Midget-class fuse rated AC at 50/60Hz, it is intended for supplemental overcurrent protection and is not for Branch Circuit Protection.

Key Features

  • Wide Rating Range: Available in 34 ratings from 1/10A through 30A to cover a broad range of circuit protection needs.
  • Time-Delay Characteristic: Time-Delay speed rating allows the fuse to ride through momentary current surges without nuisance operation.
  • Ferrule Termination: Ferrule connection/terminal type with Tin-Plated Copper terminal material for a reliable clip-mount fit.
  • Visual Indicator: Built-in blown fuse indicator pops out at the end of the fuse when it has operated, and can also trip a switch for remote indication.
  • Voltage & Frequency: Rated 250 V AC at 50/60 Hz for standard AC circuit applications.
  • Clip Mounting: Midget fuse class designed for clip mounting in compatible fuse holders and blocks.
  • Body Construction: PolyTube body/insulating material for the fuse housing.

Technical Specifications

  • Connection/Terminal Type: Ferrule
  • AC or DC: AC
  • Indication System Type: Visual Indicator
  • Mounting: Clip
  • Connection/Terminal Material: Tin-Plated Copper
  • Indication System: Yes
  • Frequency (Hz): 50/60 Hz
  • Rated voltage AC UL: 250 V
  • Speed/Characteristic: Time Delay
  • Fuse Class: Midget
  • Body/Insulating Material: PolyTube
  • Packaging: 10 EA

Typical Applications

  • Supplemental Overcurrent Protection (Not for Branch Circuit Protection)
  • Industrial Control Panels
  • Panelboards and Switchgear
  • Remote and Visual Fault Indication Systems
  • Electrical Equipment Requiring Time-Delay Protection

Why Mersen?

Mersen GFN Midget fuses combine a Time-Delay characteristic with a built-in visual blown-fuse indicator and durable PolyTube body construction, giving technicians a fast way to identify a tripped fuse without extra testing. With Tin-Plated Copper Ferrule terminals, Clip mounting, and a 250VAC, 50/60Hz AC rating across 34 available ratings from 1/10A through 30A, this GFN series delivers dependable supplemental overcurrent protection for professional electrical work.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Time-Delay Fuse
Product Material:
PolyTube
Connection Type:
Ferrule
Voltage Rating:
250V
Series:
GFN
Amperage Rating:
1/10A - 30A
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Mersen GFN10 – Frequently Asked Questions

1) Will the Mersen GFN fuse hold up to motor or transformer inrush without blowing?
That is what the time-delay characteristic is for. The GFN rides through momentary current surges instead of opening on them, so it suits control transformers, solenoids and small motor loads where a fast-acting midget fuse would nuisance trip. If your circuit has no inrush and you want the fastest clearing, a fast-acting midget like the Littelfuse BLF series is the other side of that choice.
2) Will a Mersen GFN fit my existing midget fuse holder or fuse block?
Yes, if the holder is a midget-class clip-mount block. The GFN is a midget-class fuse with ferrule terminals and clip mounting, which is the standard 13/32 x 1-1/2 inch midget footprint used by midget blocks and holders. One thing to allow for: the blown-fuse indicator pin projects from the end of the fuse, so confirm your holder or cover leaves clearance at the end cap for it to pop.
3) Can I put a 250V GFN fuse on a 480V circuit?
No. The GFN is rated 250 V AC at 50/60 Hz, and a fuse must never be applied above its voltage rating because its interrupting ability is only proven at that level. It is also an AC-only device, so it is not the fuse for a DC bus. For 480 V or 600 V control circuits you need a 600 V rated fuse.
4) Can I use a Mersen GFN fuse for branch circuit protection instead of a Class CC fuse?
No. The Mersen GFN is intended for supplemental overcurrent protection and is expressly not for branch circuit protection. If the application requires branch circuit protection with a time-delay characteristic, a Class CC fuse such as the Littelfuse CCMR040, a 40A CCMR series Class CC time-delay fuse, is the correct family to specify. Note that Class CC fuses use a rejection-style mount, so a holder built for midget clips will not accept them.
5) What is the difference between the Mersen GFN midget fuse and the Littelfuse BLF midget fuse?
Both are midget-class 250V fuses, but they differ in operating speed. The Mersen GFN is a time-delay fuse, so it rides through momentary inrush without opening, and it carries a built-in blown-fuse indicator that pops out at the end of the body. The Littelfuse BLF is a midget fast-acting fuse rated 250V with a laminated tube body. Use the GFN where motor or transformer inrush is present; use a fast-acting midget where the load has no surge and you want the quickest clearing.
6) How do I tell at a glance which GFN fuse in my panel has blown?
The GFN has a built-in indicator pin that pops out of the end of the fuse once it operates, so a technician can spot the open fuse without pulling it or metering it. The same popped pin can be used to trip a switch for remote signaling, which is how these get wired into fault annunciation on a control panel.
7) What amp ratings does the Mersen GFN series come in?
GFN covers 34 ratings from 1/10 A up to 30 A, so one series handles everything from low-current control and instrument circuits to 30 A supplemental protection. All of them share the same 250 V AC rating and ferrule terminals, which lets you standardize a panel on one fuse style and stock the amperages you actually use.
8) What is the exact part number for the 10 amp Mersen GFN indicating fuse?
The 10 A rating is Mersen GFN10. The series designation carries the amperage directly in the number, so GFN followed by the amp value identifies the rating you need when ordering across the 1/10 A to 30 A range.
9) Is a Littelfuse AGA or AGU glass fuse a substitute for a Mersen GFN?
They are not interchangeable. The Mersen GFN is a midget-class, 250VAC time-delay fuse with ferrule terminals, tin-plated copper, and a PolyTube body sized for clip mounting in midget holders and blocks. The Littelfuse AGA5 is a 5A AGA series glass fuse and the Littelfuse AGU is an AG glass tube fuse - both small glass automotive-style cartridges on different body dimensions, with no blown-fuse indicator. Use the GFN for the midget fuse clips in an industrial control panel.
10) I need a fuse above 30A - what should I use instead of the GFN?
The Mersen GFN series covers 1/10A through 30A, so anything above 30A is outside its range. For a higher-rated time-delay fuse, the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Because it is a different fuse class, confirm your holder or block is rated for it rather than for midget clips.
11) My meter manufacturer calls for a specific fuse pack - can I drop in a Mersen GFN?
Only if the equipment documentation permits it. Metering circuits are often specified as a matched set at a defined rating, such as the Square D PowerLogic energy meter fuse pack, a set of three rated 0.5A 600V. The Mersen GFN is rated 250V AC and runs 1/10A through 30A, so it will not meet a 600V metering requirement. Match the voltage rating the meter spec calls for.
12) How are Mersen GFN fuses packaged, and do I have to buy a full box?
GFN fuses are supplied in packs of 10 each, which is typical for midget fuses and convenient if you are stocking spares for a panel that uses several of the same rating.
13) What is the GFN fuse body and terminals made of, and will it hold up in a humid plant?
The body is PolyTube insulating material and the ferrule terminals are tin-plated copper. The tin plating is the part that matters in damp or mildly corrosive plant air, since it resists the oxidation on the clip contact surface that drives up resistance and heats a fuse holder.
14) If I do not need the blown-fuse indicator, is there a simpler midget fuse option?
Yes. The indicator on the Mersen GFN pops out at the end of the body for visual confirmation and can also trip a switch for remote signaling, which is useful in panels you troubleshoot often. If you do not need that feature and the load has no inrush to ride through, the Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body. Keep in mind you would be changing both the indication and the time-current characteristic.
How fast can I get the Mersen GFN10 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 GFN10 come with a warranty?
Absolutely. The Mersen GFN10 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 GFN10?
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