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Mersen
Starting at
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Mersen GDL Series Time-Delay Miniature Glass Fuse, 250VAC
The Mersen GDL Series Time-Delay Miniature Glass Fuse delivers reliable supplemental circuit protection with a 250VAC voltage rating and a compact 6.3x32mm glass body. Built with ferrule terminal connections for secure clip-mount installation, this fuse family provides professional-grade performance for applications requiring time-delay characteristics that ride through momentary inrush currents while protecting against sustained overcurrent conditions. The GDL series is RoHS compliant for lead-free, environmentally responsible installations and is supplied in bulk pack quantities suited to OEM assembly and MRO stocking programs.
Key Features
- 6.3x32mm Fuse Size: Compact glass-body form factor suitable for space-constrained applications while maintaining full protection capability.
- Glass Body Construction: Offers excellent electrical insulation properties and visual indication of fuse status for easy maintenance.
- Ferrule Terminal Design: Provides secure mechanical and electrical connections with clip mounting for reliable installation.
- 250VAC Voltage Rating: Ensures safe operation in standard AC voltage applications with proper electrical isolation and arc extinction.
- Time-Delay Characteristic: Allows temporary overcurrent conditions like motor starting or capacitive inrush while protecting against sustained faults.
- Supplemental Fuse Class: Designed for compatibility with primary protection devices in a coordinated protection scheme.
- Bulk Pack Availability: Packaged for volume consumption, supporting OEM assembly, MRO stocking, and panel-build programs.
- RoHS Compliant: Meets environmental standards for lead-free construction and responsible manufacturing practices.
Certifications & Compliance
- RoHS Compliant
Technical Specifications
- Ac Or Dc: AC
- Rohs Compliant: Yes
- Body Insulating Material: Glass
- Connection Terminal Type: Ferrule
- Fuse Class: Supplemental
- Fuse Size: 6.3x32mm
- Mounting Method: Clip
- Rated Voltage AC UL: 250 V
- Speed Characteristic: Time Delay
Typical Applications
- Industrial Control Panels and Motor Control Centers
- Commercial HVAC Equipment Protection
- Electronic Equipment and Power Supply Circuits
- Lighting Control Systems and Ballast Protection
- Instrumentation and Control Circuit Applications
- Supplemental Protection in Distribution Panels
Why Mersen?
Mersen delivers proven reliability in circuit protection, backed by RoHS compliant construction and professional-grade glass body insulation. The supplemental fuse class designation ensures compatibility with primary protection devices, while the time-delay characteristic provides the inrush-current tolerance essential for motor starting and capacitive load applications, packaged in bulk for dependable, code-compliant electrical work.
Manufacturer Resources
Product Specs
- Product Type:
- Fuse
- Product Material:
- Glass
- Connection Type:
- Ferrule
- Voltage Rating:
- 250V
- Standards:
- RoHS Compliant
- Mounting Method:
- Clip
- Department:
- Electrical
- Product Group:
- Wiring Devices
Mersen GDL1-1/2 – Frequently Asked Questions
1) Will a Mersen GDL fuse hold when my motor or transformer inrushes on startup?
That is what the GDL is built for. It is a time-delay element, so it rides through the short inrush spike of a motor start, a transformer energizing, or a capacitive load charging, then still opens on a sustained overcurrent. A fast-acting glass fuse of the same amp rating in that spot will nuisance-blow every time the load starts. Size it to the running current of the circuit, not to the inrush peak.
2) Can I use a Mersen GDL glass fuse as the only overcurrent protection on a branch circuit?
No. The GDL is a supplemental-class fuse, which means it is meant to sit downstream of a branch-circuit protective device, not to replace one. Use it on control transformer secondaries, instrument circuits, ballast and lighting control circuits, and power supply feeds inside a panel, where a listed breaker or branch-rated fuse is already protecting the feed ahead of it.
3) Is the Mersen GDL fuse rated for 120V and 240V control circuits?
Yes, up to 250VAC. That covers 120V and 208/240V control and lighting circuits. The rating is an AC rating, so do not assume a DC interrupting value from it. A fuse may always be applied at a circuit voltage at or below its rating, never above.
4) Can I replace a fast-acting 6.3x32mm glass fuse with a Mersen GDL of the same amperage?
Only if the circuit tolerates the delay. The GDL is time-delay, so it lets a fault current flow longer before opening than a fast-acting fuse of the same rating. On a motor, transformer, or ballast circuit that is exactly what you want. On semiconductor or electronics protection where the original was fast-acting for a reason, swapping to a time-delay element can let the device it protects fail first. Match the speed characteristic the equipment maker specified.
5) Can a Square D PowerLogic energy meter fuse pack be used in place of a Mersen GDL fuse?
They are not interchangeable as a general substitution. The Square D PowerLogic Energy Meter Fuse Pack is sold as a set of three fuses rated 0.5A at 600V and is intended for the metering circuit it is built around. The Mersen GDL series is a supplemental-class, time-delay glass fuse rated 250VAC in a 6.3x32mm body with ferrule terminals for clip mounting, sold across amperages from 1/16A up to 30A. If the equipment calls for a 250VAC supplemental fuse in a clip holder, the GDL is the family to order from; if the equipment is a PowerLogic energy meter, order the meter's own fuse pack.
6) I need a half-amp fuse for a 600V metering circuit - will the Mersen GDL 1/2A work?
No. The Mersen GDL1/2 is a 0.5A fuse, but it carries a 250VAC rating, so it does not cover a 600V circuit. The Square D PowerLogic Energy Meter Fuse Pack is the 0.5A 600V option and comes as a set of three, which matches a three-phase metering installation. Keep the Mersen GDL 1/2A for 250VAC supplemental protection where a 6.3x32mm clip-mounted glass fuse with time-delay characteristic is specified.
7) What amp ratings does the Mersen GDL time-delay fuse come in?
The GDL runs from 1/16A up through 30A: 1/16, 1/8, 1/4, 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2, 3, 4, 5, 6, 7, 8, 10, 15, 20 and 30 amps. The part number is the series plus the rating, so a 5 amp is GDL5 and a 1-1/2 amp is GDL1-1/2. Fractional ratings under 1A are the ones normally used on instrumentation and control transformer secondaries.
8) Are Mersen GDL fuses RoHS compliant for a lead-free spec job?
Yes, the GDL series is RoHS compliant, so it clears lead-free procurement specs on institutional, government, and export-bound equipment builds. That is the only compliance mark carried on the series.
9) How do I tell if a GDL glass fuse is blown without pulling it out of the holder?
The body is glass, so you can see the element. A clean break or a scorched, silvered interior tells you it opened. That visual check is the practical reason glass is still specified for MRO and panel work over ceramic bodies, which give you nothing to look at. On a time-delay element expect to see the spring-and-solder section separated rather than a wire simply parted.
10) Do Mersen GDL fuses come in bulk for panel builds and MRO stock?
The GDL series is packaged in bulk quantities aimed at OEM assembly, panel-build programs, and MRO shelf stock, so you can standardize a shop or a facility on one fuse family across the full 1/16A to 30A range instead of chasing one-off retail packs. Each rating is its own part number, GDL plus the amperage.
How fast can I get the Mersen GDL1-1/2 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 GDL1-1/2 come with a warranty?
Absolutely. The Mersen GDL1-1/2 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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