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Mersen GTL30 Time-Delay Plug Fuse, 125V 30A, Screw Mount
The Mersen GTL30 is a 125V, 30A time-delay plug fuse from the GTL Series, built with a glass insulating body and brass connection terminals for reliable overcurrent protection in screw-mount fuse panels. Its built-in visual indicator allows for quick identification of a blown fuse, reducing troubleshooting time. Rated for a 10 kA AC maximum breaking capacity, the GTL30 delivers dependable time-delay protection suited to motor and general branch-circuit loads.
Key Features
- Ampere Rating: 30 A rating suited for standard branch-circuit and motor-load protection.
- Time-Delay Characteristic: Time-delay speed characteristic accommodates temporary inrush current without nuisance tripping.
- Screw Mount Design: Screw mount configuration for direct installation into compatible plug fuse panels.
- Visual Indication System: Built-in visual indicator lets installers quickly spot a blown fuse.
- Glass Body Construction: Glass insulating body provides a clear view of the fuse element condition.
- Brass Connection Terminals: Brass terminal material supports secure, low-resistance electrical connections.
- Rated Voltage: 125 V AC (UL) rated voltage for standard residential and light commercial circuits.
- Breaking Capacity: 10 kA AC max I'R breaking capacity for dependable interruption performance.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- Ac Max I R Breaking Capacity I1: 10 kA
- Ampere Rating: 30 A
- Body Insulating Material: Glass
- Connection Terminal Material: Brass
- Indication System: Yes
- Product Diameter: 1.13 in
- Product Length: 1.29 in
- Product Weight: 0.06 lb
- Rated Voltage Ac Ul: 125 V
- Rohs Compliant: Yes
- Sell Pack Height: 2.31 in
- Sell Pack Length: 1.38 in
- Sell Pack Quantity: 4 Each
- Sell Pack Weight: 0.25 lb
- Sell Pack Width: 2.31 in
- Speed Characteristic: Time Delay
Typical Applications
- Residential and Light Commercial Plug Fuse Panels
- Motor and Branch-Circuit Overcurrent Protection
- Screw-Mount Fuse Panel Replacement
- Time-Delay Protection for Inrush-Sensitive Loads
- Panel Maintenance and Fuse Replacement Projects
Why Mersen?
Mersen's GTL30 plug fuse combines a glass body and brass terminals with a visual blown-fuse indicator, giving electrical professionals a clear, dependable way to protect and maintain 125V, 30A screw-mount fuse panels. With a 10 kA AC breaking capacity and RoHS-compliant construction, the GTL30 supports code-conscious, reliable overcurrent protection for time-delay applications.
Manufacturer Resources
Spec Sheet
Product Specs
- Sell Pack Length:
- 1.38 in
- Indication System Type:
- Visual Indicator
- Product Type:
- Plug Fuse
- Sell Pack Height:
- 2.31 in
- Rated voltage AC UL:
- 125 V
- Product Length:
- 1.29 in
- Product Diameter:
- 1.13 in
- Department:
- Electrical
- Rohs Compliant:
- Yes
- Indication System:
- Yes
- Sell Pack Width:
- 2.31 in
- Connection Terminal Type:
- Screw
- Mounting Method:
- Screw
- Connection/Terminal Material:
- Brass
- Product Group:
- Circuit Protection
- Body/Insulating Material:
- Glass
- Sell Pack Quantity:
- 4 Each
- AC Max I.R./Breaking Capacity: I1:
- 10 kA
- Sell Pack Weight:
- 0.25 lb
- Fuse Class:
- Plug
- Speed/Characteristic:
- Time Delay
- Product Weight:
- 0.06 lb
- Product Subgroup:
- Fuses
Mersen GTL30 – Frequently Asked Questions
1) Will a Mersen GTL plug fuse screw into an old Edison-base fuse panel?
Yes. The GTL is a plug-class fuse with a screw mounting method and screw terminal connection, so it threads directly into the standard Edison screw sockets found in residential and light commercial plug fuse panels. Body diameter is 1.13 in and overall length is 1.29 in. It is not a Type S rejection-base fuse, so if your panel already has Type S adapters installed, the GTL will not thread in.
2) Which amp ratings does the Mersen GTL time-delay plug fuse come in?
Two: GTL15 at 15A and GTL30 at 30A. Both share the same 125V AC rating and time-delay characteristic. Match the fuse amperage to the conductor the circuit is wired with, not to the load, which is what usually decides between the two.
3) Why use a time-delay plug fuse instead of a fast-acting one on a motor circuit?
Motors, compressors, and transformers draw a large inrush for a fraction of a second at startup. The GTL's time-delay characteristic rides through that surge instead of opening on it, so you avoid nuisance blowing on a healthy circuit while still clearing a genuine overload or short. For electronics or a circuit where you want the fastest possible clearing, a fast-acting fuse such as the Littelfuse BLF Series midget is the other direction to go.
4) Is a 125V plug fuse rated for a 240V circuit?
No. The GTL carries a 125 V AC UL rated voltage, which covers standard 120V branch circuits only. Do not use it on a 240V two-pole circuit or anywhere the voltage across an open fuse could exceed 125V; you need a fuse rated at or above the circuit voltage. The Littelfuse BLF midget series, for example, is a 250V fuse.
5) Can a Littelfuse CCMR040 be used in place of a Mersen GTL30 time-delay fuse?
No. The Mersen GTL is a plug-class fuse with a screw mounting method that threads directly into an Edison-base fuse panel and is rated 125V AC. The Littelfuse CCMR040 is a Class CC time-delay fuse from the CCMR series, a cylindrical ferrule fuse that seats in a Class CC fuse block or holder, not a screw shell. Both are time-delay, but the bodies and holders are entirely different, so one cannot replace the other in the same panel.
6) Can I tell if a Mersen GTL fuse is blown without pulling it out of the panel?
Yes. The GTL has a built-in visual indicator, and the insulating body is glass, so you can see the element condition through the window while the fuse is still seated. That saves unscrewing every fuse in the panel to find the open one.
7) What interrupting rating does the Mersen GTL plug fuse have?
10 kA AC maximum breaking capacity. That is the fault current the fuse can safely interrupt, and it needs to equal or exceed the available fault current at the panel where it is installed, which on a typical residential or small commercial service it does.
8) Can I use a Mersen GTL plug fuse in a fuse block or holder that takes glass tube fuses?
No. Even though the GTL has a glass body, it is a plug fuse with a screw base, not a ferrule-end cartridge. Clip-style holders take a tube fuse like the Littelfuse AGU Series or AGA Series glass fuse instead, and a Class CC fuse block takes something like the Littelfuse CCMR040 time-delay Class CC. The GTL only goes into a threaded plug fuse socket.
9) Is a Littelfuse AGU or AGA glass fuse the same thing as a Mersen GTL glass plug fuse?
They are not interchangeable. The Mersen GTL uses a glass insulating body with brass terminals, but its connection terminal type is a screw base that threads into a plug fuse panel. The Littelfuse AGU is a glass tube fuse from the AG family and the Littelfuse AGA5 is a 5A glass fuse from the AGA series - both are small cylindrical glass cartridge fuses that clip into a holder. Shared glass construction does not make them substitutes for a screw-shell fuse socket.
10) For metering circuits, should I order the Mersen GTL or the Square D PowerLogic fuse pack?
Use the Square D PowerLogic energy meter fuse pack for instrument and meter potential circuits - it is supplied as a set of three at 0.5A, 600V, sized for metering rather than branch loads. The Mersen GTL is a 125V plug fuse with a screw mount intended for branch-circuit and motor loads in Edison-base panels, and its lowest offered rating is 15A, far above a metering fuse.
11) How many fuses come in a pack of Mersen GTL plug fuses?
They sell in a 4-each pack, weighing 0.25 lb, with a single fuse at 0.06 lb. Handy for maintenance stock, since plug fuse panels typically take several of the same rating and property managers usually want spares on the shelf.
12) Is the Mersen GTL fuse RoHS compliant for a spec job?
Yes, the GTL series is listed as RoHS compliant. Construction is a glass insulating body with brass connection terminals.
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Does the Mersen GTL30 come with a warranty?
Absolutely. The Mersen GTL30 is backed by a manufacturer’s warranty.
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