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Mersen SMG Series Fast-Acting Glass Cartridge Fuse
The Mersen SMG Series is a fast-acting glass cartridge fuse family built for 250VAC circuit protection, with the broader family rated across 125-350 VAC and 140 VDC. Housed in a 4.5mm x 14.5mm (2AG) cylindrical non-rejection glass body, these fuses cover an ampere range of 1/10-10 A and are designed for clip mounting into standard fuse holders. Nickel plated brass contact materials support reliable conductivity, and SMG-V lead-style versions add a 1-1/2" wire lead on each end for direct-wire installations. Backed by UL and CSA recognition, the SMG Series is a dependable choice for protecting electronic circuits and equipment.
Key Features
- Body Style: 4.5mm x 14.5mm (2AG) cylindrical non-rejection glass body for standard fuse holder compatibility.
- Ampere Range: 1/10-10 A across the SMG family, allowing precise overcurrent protection selection.
- Voltage Rating: 250VAC, with family coverage of 125-350 VAC and 140 VDC for varied circuit requirements.
- Speed/Characteristic: Fast-Acting for rapid response to overcurrent conditions.
- Mounting: Clip mount for straightforward insertion and replacement.
- Contact Materials: Nickel plated brass for reliable, corrosion-resistant electrical contact.
- Wire Lead Option: SMG-V versions include a 1-1/2" wire lead on each end for lead-style installations.
- Connection Terminal Type: Ferrule termination for secure clip engagement.
Certifications & Compliance
- UL Listed (E90660 JDYX2.E90660)
- CSA Certified (1422-01)
- UL/CSA Recognized across rated amperage ranges per Mersen standards documentation
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Electronic Circuit Protection
- Control Panels and Instrumentation
- Consumer and Industrial Electronic Equipment
- Clip-Style Fuse Holder Installations
- Low-Voltage Circuit Overcurrent Protection
Why Mersen?
Mersen's SMG Series fast-acting glass fuses combine a compact 2AG cylindrical glass body with nickel plated brass contacts for dependable, repeatable performance in electronic circuit protection. With UL Listed and CSA Certified recognition across their rated ampere and voltage ranges, these fuses give electrical professionals a code-aware option for reliable overcurrent protection in both new installations and replacement work.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Body Style:
- Cylindrical Non Rejection
- Mounting Method:
- Clip
- Ul Certification:
- E90660 JDYX2.E90660
- Dc Voltage:
- 140 VDC
- Lead Free:
- Consult Technical Services
- Connection Terminal Type:
- Ferrule
- ROHS Compliant:
- Consult Technical Services
- Csa Certification:
- 1422-01 1422-01
- Speed/Characteristic:
- Fast-Acting
- Materials Contact:
- Nickel Plated Brass
- AC Voltage Range:
- 125 - 350 VAC
- Ampere Range:
- 1/10-10 A
- Ce Conformity:
- Consult Technical Services
- Applications:
- Electronic circuits
- I R Ac:
- 0.035 kA 0.1 kA 10 kA
- Body Material:
- Ceramic
- IR Other:
- 10 10kA @ 125VAC 150A @140VAC
- I.R DC:
- 0.15 kA
- list_batch:
- MERSEN-20260825
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Type:
- Fast-Acting Fuse
- Product Subgroup:
- Fuses
Mersen SMG5 – Frequently Asked Questions
1) Will a Mersen SMG fuse fit a 2AG fuse clip holder?
Yes. The SMG Series uses a 4.5mm x 14.5mm (2AG) cylindrical non-rejection body with ferrule ends, and it is built for clip mounting, so it drops into any standard 2AG clip-style holder. Non-rejection means there is no keying feature to block it from a standard holder of that size. If your equipment uses the larger 3AG (1/4 x 1-1/4 inch) clips, this is the wrong size body.
2) What voltage and amperage can the Mersen SMG series fuse handle?
The SMG family runs 1/10 A through 10 A, with AC ratings spanning 125 to 350 VAC and a 140 VDC rating. The common application point is 250VAC electronic circuit protection. Pick the ampere rating against your circuit's normal load, not the holder size, since every rating in the range shares the same 2AG body.
3) What is the difference between the Mersen SMG and SMG-V fuses?
Same fuse body, different termination. The standard SMG has plain ferrule ends for clip holders. The SMG-V adds a 1-1/2 inch wire lead on each end so it can be soldered or wired directly into a board or harness where there is no holder. Order the V version only if you intend to hard-wire it, since a leaded fuse will not seat in a clip.
4) I need a 250V fast-acting fuse with higher interrupting capacity than the Mersen SMG - what should I use?
Look at the Littelfuse BLF, a midget fast-acting 250V fuse in a laminated tube body. The Mersen SMG shares the fast-acting characteristic but is a small 2AG glass body with AC interrupting ratings of 0.035 kA, 0.1 kA and 10 kA depending on the rating and voltage, intended for electronic circuit protection. The midget-size BLF is the move when the panel needs a larger fuse block and more fault current capability.
5) What is the interrupting rating on the Mersen SMG fuse?
Interrupting capacity is listed as 10 kA at 125VAC and 150 A at 140VAC, with a 0.15 kA DC interrupting rating. That matters when you are protecting a control panel or instrumentation circuit fed from a source with real available fault current. Check your available fault current against the voltage you are actually applying.
6) Is the Mersen SMG fuse UL Listed and CSA certified?
Yes on both. UL file E90660 (JDYX2.E90660) and CSA certification 1422-01 are carried on the SMG Series. That is the documentation most institutional and MRO specs ask for on panel-mounted overcurrent protection.
7) What else could I buy instead of a Mersen SMG glass fuse?
For other small glass tube fuses, ZenSupply carries the Littelfuse AGA Series (AGA5, 5A) and the Littelfuse AGU Series glass tube fuse. If your panel needs a midget-size fast-acting fuse at 250V rather than a small glass cartridge, the Littelfuse BLF Series laminated tube fuse covers that. Match the body size to your holder first, then the ampere and voltage rating.
8) Will a Littelfuse CCMR040 work where a Mersen SMG fuse is installed?
No. The CCMR040 is a 40A Class CC time-delay fuse, a rejection-style branch circuit fuse for motor circuits. The Mersen SMG covers 1/10 to 10 A in a non-rejection 2AG glass body and is fast-acting rather than time-delay. Different ampere class, different body, and the time-delay curve would not protect the electronic circuit an SMG is chosen for.
9) Which of these fuses is UL and CSA listed for an institutional panel submittal?
The Mersen SMG Series carries UL Listing under E90660 JDYX2.E90660 and CSA certification 1422-01, which is the documentation to attach for a submittal on an electronic circuit protection fuse in a 2AG clip holder. Among the glass-body peers, the Littelfuse AGA5 is identified as a 5A AGA series glass fuse, so verify the AGA agency file against your spec separately before substituting.
10) Are the contacts on the Mersen SMG fuse corrosion resistant for a panel in a damp location?
Contacts are nickel plated brass, which resists corrosion and keeps clip contact resistance stable over repeated replacement. It is still a glass-bodied electronic circuit fuse, so keep it inside an enclosure rated for the environment rather than relying on the fuse itself.
How fast can I get the Mersen SMG5 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 SMG5 come with a warranty?
Absolutely. The Mersen SMG5 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 SMG5?
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