Littelfuse LGR Series Small-Di...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$7.63
Littelfuse LGR Series Small-Dimension Fast-Acting Fuse, 300VAC

Littelfuse LGR Series Small-Dimension Fast-Acting Fuse, 300VAC

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Model: LGR001

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

$7.63
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Littelfuse LGR Series Small-Dimension Fast-Acting Fuse, 300VAC

The Littelfuse LGR Series is a line of fast-acting fuses rated 300VAC, engineered to deliver dependable overcurrent protection in electrical and electronic circuits. Available in ampere ratings from 1A to 10A, the LGR Series combines a small-dimension footprint with a high 10000A@300VAC interrupting rating, giving it the fault-clearing capacity needed for demanding power distribution and control applications. Backed by Littelfuse engineering and UL recognition, the LGR Series is designed to deliver a fast, predictable response to overcurrent conditions, helping protect wiring, components, and connected equipment in professional and industrial installations that require code-compliant circuit protection.

Key Features

  • Ampere Rating Range: Available from 1A to 10A, the LGR Series lets you match fuse selection to the circuit's current-carrying requirements, helping prevent nuisance operation while still responding to genuine overcurrent conditions.
  • Fast-Acting Opening: The Fast-Acting (F) opening characteristic allows LGR Series fuses to respond quickly to overcurrent fault conditions, helping limit potential damage to connected equipment and wiring.
  • High Interrupting Rating: A 10000A@300VAC interrupting rating gives every fuse in the series the capacity to safely clear higher-energy fault currents without compromising circuit integrity.
  • Voltage Rating: Rated for use on 300VAC systems, the LGR Series is suited to standard AC electrical and electronic circuit designs that call for this class of protection.
  • LGR Series Construction: Engineered as part of Littelfuse's LGR Series small-dimension fuse line, built for consistent, repeatable performance across production runs.
  • Compact, Small-Dimension Format: The small-dimension body allows LGR Series fuses to fit standard fuse holders and panel layouts commonly used for this fuse class.

Certifications & Compliance

  • UL Recognized Component, File No. E10480

Technical Specifications

  • Series: LGR
  • Ampere Rating Range: 1A - 10A
  • Voltage Rating: 300VAC
  • Interrupting Rating: 10000A@300VAC

Typical Applications

  • Overcurrent and Short-Circuit Protection
  • Industrial and Commercial Electrical Equipment
  • Control Panels and Electronic Assemblies
  • General-Purpose Circuit Protection
  • Panel and Equipment-Level Fault Protection
  • OEM and Electrical Distribution Assemblies

Why Littelfuse?

Littelfuse is a recognized name in circuit protection, and the LGR Series reflects that standard with a UL-recognized fast-acting design rated for 300VAC and backed by a 10000A@300VAC interrupting rating across every ampere rating in the line. For electricians, panel builders, and OEMs who need reliable, code-compliant overcurrent protection, the Littelfuse LGR Series delivers consistent, repeatable performance backed by established fuse manufacturing and testing standards, making it a dependable choice for both replacement and new-build applications.

Product Specs

Series:
LGR
Voltage Rating:
300VAC
Product Type:
Fast-Acting Fuse
Amperage Rating:
1A - 10A
Listing:
UL Recognized
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse LGR001 – Frequently Asked Questions

1) What amp ratings are available in the Littelfuse LGR Series 300VAC fuse?
The LGR Series covers 1A through 10A, and the orderable ratings are 1A (LGR001), 2A (LGR002), 5A (LGR005) and 10A (LGR010). Every rating in the line carries the same 300VAC voltage rating and the same 10000A@300VAC interrupting rating, so stepping up or down in amperage does not change the fault-clearing capacity you get.
2) Can I use a 300VAC LGR fuse on a 480V control circuit?
No. The LGR Series is rated 300VAC, so it must not be applied above that voltage. A 480V control circuit needs a fuse rated at least 480V or 600V. For a low-amperage 600V job, the Square D PowerLogic meter fuse pack is rated 0.5A 600V; for larger 600V branch and feeder protection, look at a Class RK1 fuse such as the Mersen A6K-R series.
3) What fault current can the LGR Series interrupt?
10000A at 300VAC, across every ampere rating from 1A to 10A. That is the figure to check against the available fault current at the point of installation; if your calculated short-circuit current at that panel or assembly exceeds 10kA, this fuse is not the right choice.
4) I need a time-delay fuse instead of a fast-acting one for a motor load - what should I look at instead of the LGR?
The Littelfuse LGR Series is fast-acting, so it responds quickly to overcurrent and is not the choice where a motor or transformer inrush would push it open on startup. For a time-delay characteristic, the Mersen A2D-R is a Class RK1 time-delay fuse from the Amp-Trap 2000 line with SmartSpot indication, which also gives you a visual indicator that the fuse has opened. Keep the LGR for control and electronic circuits where fast clearing protects downstream components.
5) What is the difference between a Littelfuse LGR fast-acting fuse and a Mersen A2K Series fast-acting fuse?
Both open quickly on overcurrent, but they are different fuse classes for different equipment. The Littelfuse LGR Series is a small-dimension fast-acting fuse rated 300VAC with a 10000A at 300VAC interrupting rating, covering 1A through 10A, and it fits the compact fuse holders and panel layouts used for that class. The Mersen A2K Series is an Amp-Trap fast-acting Class RK1 fuse rated 250V, which is a rejection-style branch and feeder fuse that mounts in Class R fuse blocks and switches. If the panel drawing calls for Class RK1, the LGR small-dimension body will not fit those clips; if the circuit is a control or electronic branch in the 1A to 10A range, the LGR is the format built for it.
6) Can a Littelfuse LGR fuse replace a Mersen A2K12R in a disconnect switch?
No. The Mersen A2K12R is part of the A6K-R series, a Class RK1 fast-acting fuse, which is a rejection-style body sized for Class R fuse clips in disconnects and panelboards. The Littelfuse LGR Series is a small-dimension fuse rated 300VAC in 1A through 10A ratings, dimensioned for compact fuse holders rather than Class R mountings. The two share a fast-acting characteristic but are not mechanically interchangeable.
7) Is the Littelfuse LGR fuse UL listed or UL recognized?
It is a UL Recognized Component, under File No. E10480. Recognized means it is approved as a component for use inside listed equipment rather than as a standalone listed device, which is how panel builders and OEMs normally apply this class of small-dimension fuse.
8) Will LGR fuses fit a standard fuse holder in my panel?
LGR fuses are built in the small-dimension format, so they drop into the standard holders and panel clips used for that fuse class. They are not a Class R, Class J or medium-voltage ferrule fuse, so they will not fit rejection-style Class RK1 blocks such as those used for the Mersen A2K series, or medium-voltage ferrule holders like the Mersen D0R0 Amp-Trap.
9) I need a replacement fuse for an existing LGR holder, how do I order the right one?
Order by amp rating, since that is the only variable in the line. The part number follows the rating: LGR001 for 1A, LGR002 for 2A, LGR005 for 5A, LGR010 for 10A. Match the amperage printed on the fuse you pulled out, and the 300VAC and 10kA ratings carry over automatically.
10) Is the Mersen A2K series a direct substitute for a Littelfuse LGR fuse?
Not a drop-in. The Mersen A2K Amp-Trap is a fast-acting Class RK1 fuse rated 250V, a different physical class and mounting style from the LGR small-dimension fuse. Both are fast-acting, but a Class RK1 fuse goes into Class R blocks, not small-dimension clips, and the voltage rating differs from the LGR's 300VAC.
11) Is the LGR Series the right fuse for a medium voltage switchgear circuit?
No. The Littelfuse LGR Series is rated 300VAC with a 10000A at 300VAC interrupting rating, which places it in low-voltage electrical and electronic circuit protection. For medium voltage work, the Mersen A055F1D0R0-150E is a D0R0 series Amp-Trap E-rated medium voltage fuse with ferrule terminals, built for that application. Use the LGR for control panels, electronic assemblies, and equipment-level protection on 300VAC systems.
12) My panel spec calls for a UL rejection-class fuse - does the LGR Series meet that?
The Littelfuse LGR Series is a UL Recognized Component under File No. E10480, which is a component recognition rather than a Class R rejection listing. If the drawing specifically calls out Class RK1, the Mersen A2K Series fast-acting 250V fuse or the A2D-R time-delay fuse are the Class RK1 options. The LGR is the fit where the spec calls for a small-dimension 300VAC fast-acting fuse in the 1A to 10A range.
How fast can I get the Littelfuse LGR001 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 Littelfuse LGR001 come with a warranty?
Absolutely. The Littelfuse LGR001 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 Littelfuse LGR001?
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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