Mersen AG40 Class G Time Delay...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$102.53
$36.94
Mersen AG40 Class G Time Delay Fuse, 40A 480VAC

Mersen AG40 Class G Time Delay Fuse, 40A 480VAC

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Model: AG40

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

$102.53
$36.94
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Mersen AG40 Class G Time Delay Fuse, 40A 480VAC

The Mersen AG40 Class G Time Delay Fuse delivers reliable 40A overcurrent protection at 480VAC using advanced Amp-Trap technology. This ferrule-terminal fuse features tin-plated copper connection terminals and a GMG body insulating material for dependable performance in commercial and industrial applications, with a 100 kA breaking capacity for high-energy fault interruption. The time delay characteristic allows temporary overloads for motor starting while still clearing sustained faults and short circuits quickly.

Key Features

  • 40A Current Rating: Provides precise overcurrent protection for medium-duty electrical circuits and equipment loads.
  • 480VAC Voltage Rating: Engineered for commercial and industrial three-phase power systems with reliable performance.
  • 100 kA Breaking Capacity: Delivers exceptional fault interruption capability for high-energy electrical systems.
  • Time Delay Characteristic: Allows temporary overloads while providing fast protection against sustained faults and short circuits.
  • Class G Design: Meets stringent performance standards for size rejection and current limitation in critical applications.
  • Ferrule Terminal Construction: Tin-plated copper terminals ensure secure connections and long-term reliability.
  • GMG Insulating Material: Advanced body construction provides superior arc quenching and electrical isolation.
  • Clip Mounting: Compact 2.25 in length and 0.037 lb weight for easy installation in standard fuse holders.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Ac Or Dc: AC
  • Body Insulating Material: GMG
  • Rohs Compliant: Yes
  • Ampere Rating: 40 A
  • Rated Voltage Ac Ul: 480 V
  • Ac Max I R Breaking Capacity I1: 100 kA
  • Connection Terminal Material: Tin-Plated Copper
  • Connection Terminal Type: Ferrule
  • Frequency Hz: 50/60 Hz
  • Fuse Class: Class G
  • Mounting Method: Clip
  • Product Length: 2.25 in
  • Product Weight: 0.037 lb
  • Speed Characteristic: Time Delay

Typical Applications

  • Motor Control Centers and Industrial Equipment Protection
  • Commercial HVAC Systems and Building Services
  • Manufacturing Equipment and Process Control
  • Distribution Panels and Switchgear Applications
  • Pump Stations and Water Treatment Facilities
  • Food Service and Refrigeration Systems

Why Mersen?

Mersen Class G fuses combine RoHS compliant construction with precision engineering for dependable overcurrent protection. The tin-plated copper ferrule terminals and GMG insulating body support secure connections and long-term reliability, while the compact 2.25 in length and 0.037 lb weight simplify installation. Trust Mersen's Amp-Trap technology for code-compliant, high-performance protection in demanding professional electrical work.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Type:
Fuse
Amperage Rating:
40A
Voltage Rating:
480VAC
Connection Type:
Ferrule
Product Material:
GMG
Product Finish:
Tin-Plated Copper
Standards:
RoHS Compliant
Department:
Electrical
Product Group:
Wiring Devices

Mersen AG40 – Frequently Asked Questions

1) Can I use a 40A Class G time delay fuse on a motor circuit without nuisance blowing at startup?
That is what the time delay element is for. The AG40 rides through the inrush of a motor start or a transformer energizing, then still opens on a sustained overload or short. Fast-acting fuses like the Littelfuse BLF midget series are the wrong pick for motor starting duty; they are built to clear quickly and will tend to open on inrush.
2) Is the Mersen AG40 rated for a 480V three-phase panel?
Yes. It carries a 480VAC UL rating at 50/60 Hz and is an AC-only device, so it suits 480V three-phase distribution, motor control centers and switchgear. Do not apply it on a DC circuit, as no DC rating is carried on it.
3) Is a Class G fuse the same thing as an AGU or AGA glass tube fuse?
No, and the naming trips people up. Mersen's AG40 is a UL Class G branch circuit fuse at 480VAC with tin-plated copper ferrules and a GMG body. Littelfuse AGA and AGU are glass tube fuses in the small automotive and appliance style, sold for low voltage circuits. They are not interchangeable and do not share holders.
4) Is the Littelfuse CCMR040 an equivalent to the Mersen AG40 Class G fuse?
Both are 40A time-delay fuses, but they are different fuse classes and are not interchangeable in the same holder. The Mersen AG40 is a Class G time-delay fuse rated 40A at 480VAC with ferrule terminals and clip mounting, while the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. Class G and Class CC fuse blocks use different dimensional and rejection features, so choose the fuse that matches the class marked on the block or holder you are feeding.
5) What fault current can a Mersen AG40 interrupt?
100 kA AC interrupting rating. That covers the available fault current at most commercial and industrial service points, which is why Class G fuses like this get used ahead of control transformers and in distribution panels where the bolted fault duty is high.
6) How does the AG40 mount, and does it need any hardware?
Clip mounting. The ferrule ends seat into the spring clips of a Class G fuse block or holder, so nothing bolts down and no lugs are involved. The terminals are tin-plated copper for a low-resistance grip in the clip.
7) What part number do I order for a 40 amp Mersen Class G fuse?
The manufacturer part number is AG40. Class G is ordered by ampere rating within the size band, so the amperage is baked into the number, and there are no finish or length options to specify.
8) Can a Littelfuse BLF midget fuse be used in place of a Mersen AG40?
No. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body, so it neither matches the Mersen AG40's 480VAC rating nor its time-delay characteristic that rides through motor inrush. For a 480VAC circuit with motor starting current, stay with the Class G time-delay AG40; the BLF suits 250V circuits where fast-acting protection is wanted.
9) What is the difference between the Mersen AG40 and Littelfuse AGA or AGU glass fuses?
They serve different circuits. The Mersen AG40 is a Class G time-delay fuse for 480VAC commercial and industrial branch circuits, with tin-plated copper ferrule terminals and clip mounting in a 2.25 in body. The Littelfuse AGA series, such as the 5A AGA5, and the AGU series are AG glass tube fuses used for low-current protection. Despite the similar-looking AG designation, an AG glass tube fuse is not a Class G substitute.
10) Would a Square D PowerLogic energy meter fuse pack work for protecting a 40A motor circuit?
No. The Square D PowerLogic fuse pack is a set of three 0.5A 600V fuses intended for energy meter voltage-sensing leads, not for load current. A 40A motor or equipment feeder needs the Mersen AG40 Class G time-delay fuse, rated 40A at 480VAC with 100 kA breaking capacity. The two are complementary rather than alternatives if you have metering on the same switchgear.
11) Is the Mersen AG40 RoHS compliant for a facility spec?
Yes, it is RoHS compliant. For MRO and institutional purchasing that is usually the checkbox on the submittal, and it holds across the AG40's construction, including the tin-plated copper terminals.
How fast can I get the Mersen AG40 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 AG40 come with a warranty?
Absolutely. The Mersen AG40 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 AG40?
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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