Mersen GSL Series Time-Delay P...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$6.06
Mersen GSL Series Time-Delay Plug Fuse, 125V

Mersen GSL Series Time-Delay Plug Fuse, 125V

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Model: GSL20

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

$6.06
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Mersen GSL Series Time-Delay Plug Fuse, 125V Screw Mount

The Mersen GSL Series Plug Fuse is a 125V AC UL-rated, screw-mount time-delay fuse built for industrial and residential motor load circuits. Featuring a glass body and a visual indicator that shows at a glance when the fuse has blown, this GSL Series fuse combines dependable overcurrent protection with fast, safe troubleshooting. Its brass screw terminals and 10 kA AC maximum interrupt rating make it a solid choice for panelboards and load centers where time-delay protection is required for motor and cycling loads.

Key Features

  • Time-Delay Characteristic: Speed/Characteristic rated Time Delay, suited for motor loads and cycling circuits per Mersen's plug fuse line.
  • Rated Voltage: 125V AC UL rated voltage for standard residential and industrial branch circuits.
  • Screw Mount Connection: Screw mounting with Screw connection/terminal type for secure, standard plug-fuse socket installation.
  • Brass Terminal Construction: Connection/terminal material is Brass for reliable, low-resistance contact.
  • Visual Indicator: Built-in Indication System (Visual Indicator type) lets technicians quickly identify a blown fuse without testing.
  • Interrupt Rating: AC Max I.R./Breaking Capacity of 10 kA for dependable fault-current interruption.
  • Glass Body: Body/Insulating Material is Glass, Fuse Class Plug, for durable, visible element construction.
  • Compact Dimensions: Product Length 1.29 in and Product Diameter 1.13 in for standard plug fuse sockets.

Certifications & Compliance

  • UL Rated Voltage AC: 125 V

Technical Specifications

  • Product Length: 1.29 in
  • Product Diameter: 1.13 in
  • Mounting: Screw
  • Connection/Terminal Type: Screw
  • Connection/Terminal Material: Brass
  • AC Max I.R./Breaking Capacity: 10 kA
  • Rated Voltage AC UL: 125 V
  • Fuse Class: Plug
  • Speed/Characteristic: Time Delay
  • Body/Insulating Material: Glass
  • Indication System: Yes
  • Indication System Type: Visual Indicator
  • Sell Pack Quantity: 4 Each
  • Sell Pack Length: 1.38 in
  • Sell Pack Width: 2.31 in
  • Sell Pack Height: 2.31 in
  • Sell Pack Weight: 0.25 lb

Typical Applications

  • Motor Load and Cycling Circuit Protection
  • Residential and Industrial Panelboards
  • Plug Fuse Socket Replacement
  • Receptacle and Branch Circuit Protection
  • Load Center Overcurrent Protection

Why Mersen?

Mersen's GSL Series plug fuses pair a glass body and visual indicator with brass screw terminals and a 10 kA interrupt rating for dependable, code-compliant overcurrent protection. The time-delay design is engineered for motor and cycling loads, giving electricians and facility teams a reliable, easy-to-inspect fuse for panelboard and load center applications.

Manufacturer Resources

Spec Sheet

Product Specs

Sell Pack Length:
1.38 in
Product Group:
Wiring Devices
Indication System Type:
Visual Indicator
Sell Pack Quantity:
4 Each
Product Type:
Fuse
Indication System:
Yes
Sell Pack Width:
2.31 in
Product Diameter:
1.13 in
Sell Pack Weight:
0.25 lb
Sell Pack Height:
2.31 in
Fuse Class:
Plug
Department:
Electrical
Product Length:
1.29 in

Mersen GSL20 – Frequently Asked Questions

1) Will a Mersen GSL plug fuse screw into a standard Edison-base fuse socket in my panel?
Yes. The GSL Series is a Plug class fuse with a screw mount and screw-type terminals, so it threads into the standard plug fuse sockets found in older load centers and panelboards. Body size is 1.29 in long by 1.13 in diameter, which is the usual plug fuse envelope. Terminals are brass for low-resistance contact.
2) Which GSL amperage do I order for a motor circuit, 15, 20 or 30 amp?
Three ratings are offered: GSL15 (15A), GSL20 (20A) and GSL30 (30A). Match the fuse to the branch circuit conductor and the motor full-load amps, not to the motor nameplate horsepower alone. The time-delay characteristic is what lets the fuse ride through motor inrush without nuisance blowing, so on a cycling or motor load you size to the FLA and let the delay handle starting current.
3) What is the interrupting rating and voltage on the Mersen GSL plug fuse?
125V AC UL rated, with a 10 kA AC maximum interrupting rating. That covers standard 120V residential and industrial branch circuits. It is not a 250V fuse, so do not put it on a 240V two-pole circuit.
4) Can I use a GSL plug fuse in a Class CC fuse holder?
No. The GSL is a Plug class fuse with a screw base and only fits Edison-base plug fuse sockets. A Class CC holder takes a rejection-style cylindrical fuse such as the Littelfuse CCMR Series time-delay, for example the CCMR040 at 40A. The two are not interchangeable in either direction.
5) I need a fast-acting fuse instead of time-delay - what should I look at?
The Mersen GSL series is time-delay throughout, built to ride through motor inrush on cycling loads, so it is not the right pick where the circuit needs to clear quickly. For a fast-acting characteristic, the Littelfuse BLF series is a midget fast-acting fuse rated 250V in a laminated tube body. Note that the BLF is a midget cartridge, not a screw-base plug fuse, so it requires a midget fuse holder rather than a plug fuse socket.
6) Can a Littelfuse CCMR time-delay fuse be used instead of a Mersen GSL plug fuse?
No. The Mersen GSL is a Plug class fuse with a screw base that threads into a plug fuse socket in a panelboard or load center. The Littelfuse CCMR040 is a Class CC time-delay fuse, a ferrule-style cartridge fuse that seats in a Class CC fuse holder or block. Both are time-delay, so both suit motor and cycling loads, but the bodies and holders are not interchangeable - a Class CC fuse cannot thread into a plug fuse socket. Match the fuse class to the fuseholder already in the equipment.
7) How do I tell if a GSL fuse has blown without pulling it and testing it?
The GSL has a built-in visual indicator, so a blown fuse shows itself at a glance through the glass body. For maintenance techs working a live panel that saves pulling each fuse and metering it.
8) Will a Mersen GSL plug fuse work in a metering application like the Square D PowerLogic fuse pack?
No. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended for metering circuits, where the voltage rating and the very low ampere rating are specific to the instrument. The Mersen GSL is rated 125V AC UL and is offered in 15A, 20A, and 30A branch circuit ratings with a 10 kA AC interrupting rating, for plug fuse sockets in panelboards and load centers. The GSL voltage rating is below what a 600V metering circuit requires.
9) How many fuses come in a pack of Mersen GSL plug fuses?
They sell four to a pack. The pack measures 1.38 x 2.31 x 2.31 in and weighs 0.25 lb, which is convenient for stocking a truck or an MRO crib in small quantities.
How fast can I get the Mersen GSL20 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 GSL20 come with a warranty?
Absolutely. The Mersen GSL20 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 GSL20?
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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