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Mersen GW Series 125V Fast-Acting Screw Mount Plug Fuse
The Mersen GW Series Plug Fuse is a 125V fast-acting fuse family built for industrial and residential branch circuits, including receptacle, lighting, and motor-load protection. Available across a Motor FLA rating span of 3A to 15A, every GW Series fuse in this family shares the same glass insulating body, brass screw-mount terminals, and built-in visual indication system that lets technicians quickly identify a blown fuse. With an AC breaking capacity of 10 kA and RoHS-compliant construction, this GW Series family delivers reliable overcurrent protection in a compact screw-in form factor, regardless of the amperage rating selected.
Key Features
- Amperage Range: Available from 3A to 15A Motor FLA rating to match branch-circuit and motor-load requirements.
- Screw Mount Terminals: Brass screw-type connection for secure, low-resistance installation in standard fuse holders.
- Glass Body Construction: Glass insulating body resists heat and provides a clear view of the fuse element.
- Fast-Acting Speed: Fast-acting characteristic suited for receptacle and lighting circuit protection.
- 125V Rated: Rated voltage AC (UL) of 125V for standard branch-circuit applications, shared across the full amperage range.
- 10 kA Breaking Capacity: AC maximum interrupting/breaking capacity of 10 kA for dependable fault clearing.
- Visual Indicator: Built-in visual indication system shows at a glance when the fuse has opened.
- Compact Dimensions: Product length of 1.29 in and diameter of 1.13 in for standard plug fuse holders.
- RoHS Compliant: Manufactured to RoHS compliance standards.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- Amperage Rating (Motor FLA): 3A - 15A, selectable by option
- Fuse Class: Plug
- Mounting: Screw
- Connection/Terminal Type: Screw
- Connection/Terminal Material: Brass
- Body/Insulating Material: Glass
- Rated Voltage AC (UL): 125 V
- AC Max I.R./Breaking Capacity: 10 kA
- Speed/Characteristic: Fast-Acting
- Indication System: Yes
- Indication System Type: Visual Indicator
- Product Length: 1.29 in
- Product Diameter: 1.13 in
- ROHS Compliant: Yes
Typical Applications
- Residential and Industrial Branch Circuits
- Motor Overload Protection Across the 3A-15A Range
- Receptacle and Lighting Circuit Protection
- Plug Fuse Panels and Fuse Boxes
- Renovation and New Construction Wiring
Why Mersen?
Mersen builds its GW Series plug fuses with a durable glass body, brass screw-mount terminals, and a visual indicator system so electricians can identify a blown fuse without guesswork, across the full 3A-15A Motor FLA range. Backed by a 10 kA breaking capacity and RoHS-compliant materials, these fast-acting fuses deliver dependable, code-conscious overcurrent protection for residential, industrial, and motor-load circuits alike.
"Manufacturer Resources
Mersen Product Catalog
Product Specs
- Product Length:
- 1.29 in
- Mounting Method:
- Screw
- Sell Pack Length:
- 1.38 in
- AC Max I.R./Breaking Capacity: I1:
- 10 kA
- Indication System:
- Yes
- Sell Pack Quantity:
- 4 Each
- Rated voltage AC UL:
- 125 V
- Sell Pack Height:
- 2.31 in
- Fuse Class:
- Plug
- Sell Pack Weight:
- 0.25 lb
- Connection Terminal Type:
- Screw
- Sell Pack Width:
- 2.31 in
- Indication System Type:
- Visual Indicator
- Connection/Terminal Material:
- Brass
- ROHS Compliant:
- Yes
- Speed/Characteristic:
- Fast-Acting
- Product Diameter:
- 1.13 in
- Body/Insulating Material:
- Glass
- list_batch:
- MERSEN-20260825
- Product Type:
- Plug Fuse
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Material:
- Glass
- Connection Type:
- Screw
- Voltage Rating:
- 125V
- Amperage Rating:
- 3A - 15A
- Standards:
- RoHS
- Product Subgroup:
- Fuses
Mersen GW15 – Frequently Asked Questions
1) Will a Mersen GW plug fuse screw into a standard Edison-base fuse holder?
Yes. The GW Series is a plug-class fuse with brass screw terminals and screw mounting, so it threads into standard plug fuse holders and fuse boxes. Body measures 1.29 in long with a 1.13 in diameter, which is the normal footprint for a plug fuse socket.
2) What amp ratings does the Mersen GW plug fuse come in?
Three ratings are offered across a 3A to 15A Motor FLA span: GW3 at 3A, GW10 at 10A, and GW15 at 15A. Pick the rating against the branch circuit or motor full-load amps you are protecting.
3) Can I use a GW fuse on a 240V circuit?
No. Rated voltage AC is 125V, so the GW is for 120V-class branch circuits only. A 240V two-pole fused circuit needs a fuse rated for that voltage, not this one.
4) Fast-acting or time-delay: which plug fuse do I need for a motor circuit?
The GW Series is fast-acting, which suits receptacle and lighting circuits where there is no inrush. A motor's starting surge will often open a fast-acting fuse, so for a motor load many electricians specify a dual-element time-delay plug fuse instead, such as the Littelfuse SLO Series (SLO030) or the Littelfuse SOO Series dual-element Slo-Blo plug fuse. Use the GW where you want quick clearing on a fault and no tolerance for sustained overload.
5) Is the Mersen GW a Type S fuse or an Edison-base type?
The GW is a plug fuse with a plain screw base, not a Type S rejection-base fuse. If your panel has Type S adapters installed, you need a Type S fuse like the Littelfuse SLO030 or the Littelfuse SOO Series instead, since the adapter will not accept a standard screw base.
6) What should I use instead of a Mersen GW plug fuse on a motor circuit that trips the fuse at startup?
The Mersen GW Series is a fast-acting plug fuse, so it clears quickly and does not ride through the inrush current a motor draws at start. For a motor branch circuit that needs to tolerate starting current, a time-delay plug fuse is the usual choice: the Littelfuse SLO030 is a 30A Type S time-delay plug fuse, and the Littelfuse SOO Series is a dual-element Type S Slo-Blo plug fuse rated 125V. Both are built to hold through a brief overload rather than open on it, while the GW opens fast on overcurrent in receptacle and lighting circuits.
7) Is a Littelfuse SOO Series fuse a direct swap for a Mersen GW plug fuse?
They are not interchangeable in the same holder. The Mersen GW Series uses a plain screw-mount brass terminal that threads into a standard Edison-base plug fuse holder, while the Littelfuse SOO Series is a Type S Slo-Blo plug fuse, which requires a Type S adapter to be installed in the fuseholder first and is sized so only the matching amperage fuse will seat. Both are rated 125V, but once a Type S adapter is in a socket, a GW will no longer thread into it.
8) I need a 30A plug fuse - does the Mersen GW Series go that high?
The Mersen GW Series covers a 3A to 15A Motor FLA range, so a 30A circuit falls outside it. For 30A, the Littelfuse SLO030 is a 30A Type S time-delay plug fuse. Note the two differ in more than amperage: the SLO030 is a Type S time-delay design, where the GW is fast-acting with a glass body and a visual blown-fuse indicator.
9) How do I tell if a Mersen GW fuse has blown without pulling it out?
It has a built-in visual indicator, and the body is glass, so you can see the element and the indicator through it. That lets a maintenance tech walk a fuse panel and spot the open fuse without unscrewing each one.
10) Is a 10 kA interrupting rating enough for my fuse panel?
The GW Series clears up to 10 kA AC. On residential and light commercial 120V branch circuits the available fault current at the fuse panel is normally well under that figure, so 10 kA covers typical plug-fuse installations. On a service with higher calculated available fault current, verify against your short-circuit study before using it.
11) Can I mix GW fuse amp ratings in the same old fuse panel in my rental property?
You can, as long as each fuse matches the ampacity of the branch circuit it protects, not the load you want to run. All three ratings (3A, 10A, 15A) share the same 125V rating, glass body, screw base and 1.29 x 1.13 in size, so they interchange physically in the same holders. Never fit a 15A where the wiring only supports less.
12) Which plug fuse lets a maintenance tech tell at a glance that it has blown?
The Mersen GW Series carries a built-in visual indication system behind a glass insulating body, so the opened element is visible without pulling the fuse from the holder - useful when standardizing a building's panels on one fuse. The Littelfuse SLO030 and the Littelfuse SOO Series are Type S plug fuses, chosen more often for their time-delay characteristic than for indication. If blown-fuse identification is the deciding factor on a 3A to 15A fast-acting circuit, the GW is the one built around it.
13) For tamper-resistant fusing required by code in a rental unit, is the Mersen GW the right choice?
The Mersen GW Series is a standard screw-mount plug fuse at 125V with a 10 kA AC breaking capacity, not a rejection-base design, so any amperage in the 3A to 15A range will thread into the same socket. Where the specification calls for a non-interchangeable Type S base, look to the Littelfuse SOO Series, a dual-element Type S Slo-Blo plug fuse rated 125V, or the Littelfuse SLO030 at 30A in Type S time-delay.
14) How many Mersen GW fuses come in a pack?
They sell four per pack, at 0.25 lb a pack. Handy for an MRO crib or a van stock where you want spares of each rating on hand.
15) Are Mersen GW plug fuses RoHS compliant for a green-spec job?
Yes, GW Series plug fuses are built to RoHS compliance, which is what sustainable distributors and institutional specs usually ask for on wiring devices.
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Does the Mersen GW15 come with a warranty?
Absolutely. The Mersen GW15 is backed by a manufacturer’s warranty.
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