Littelfuse FLM Series Time-Del...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$11.24
Littelfuse FLM Series Time-Delay Fuse, 250VAC Midget/5AG

Littelfuse FLM Series Time-Delay Fuse, 250VAC Midget/5AG

(No reviews yet) Write a Review

Model: FLM.800

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

$11.24
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Littelfuse FLM Series Time-Delay Fuse, 250VAC Midget/5AG

The Littelfuse FLM Series is a family of 250VAC time-delay (Slo-Blo) fuses, available in FLM.500, FLM.600, and FLM.800 current ratings, engineered to protect control circuit transformers, solenoids, and other circuits with high inrush currents. Every FLM Series fuse is rated 250VAC and 125VDC with a 10000A@250VAC interrupting rating, pairing a slow-blow opening characteristic with dependable overcurrent protection in a compact Midget/5AG package. UL recognized, the FLM Series is excellent for supplemental protection of small motors in commercial and industrial control panels.

Key Features

  • Time-Delay Opening: Slo-Blo/Time Lag (T)/Time Delay construction rides through momentary inrush current without nuisance opening.
  • Dual Voltage Rating: Rated 250VAC and 125VDC for use across both AC and DC control circuits.
  • High Interrupting Rating: 10000A@250VAC interrupting rating supports safe fault clearing in demanding control-circuit applications.
  • Compact Midget/5AG Package: Standard Midget/5AG fuse size fits common fuse holders and blocks used in control panels.
  • Multiple Current Ratings: The FLM Series is available in FLM.500, FLM.600, and FLM.800 versions to match circuit current requirements.
  • Supplemental Motor Protection: Excellent for supplemental protection of small motors; for motor branch-circuit protection see Class CC fuses.
  • Transformer & Solenoid Protection: Purpose-built to protect control circuit transformers, solenoids, and other high-inrush loads.

Certifications & Compliance

  • UL Recognized (File E10480)

Technical Specifications

  • Series: FLM
  • Voltage Rating: 250VAC/125VDC
  • Configuration: Slo-Blo Time-Delay
  • Opening: Slo-Blo/Time Lag (T)/Time Delay
  • Interrupting Rating: 10000A@250VAC
  • Package Size: Midget/5AG
  • Available Models: FLM.500, FLM.600, FLM.800

Typical Applications

  • Control Circuit Transformer Protection
  • Solenoid and Coil Circuit Protection
  • Supplemental Protection for Small Motors
  • Commercial and Industrial Control Panels
  • High Inrush Current Circuits

Why Littelfuse?

Littelfuse is a recognized name in circuit protection, and the FLM Series time-delay fuses reflect that engineering discipline with UL recognized construction and a 10000A@250VAC interrupting rating for dependable performance across the FLM.500, FLM.600, and FLM.800 ratings. Specifying the Littelfuse FLM Series for control circuit and supplemental motor protection helps ensure reliable, code-compliant overcurrent protection in professional electrical installations.

Product Specs

Product Type:
Time-Delay Fuse
Series:
FLM
Voltage Rating:
250VAC/125VDC
Configuration:
Slo-Blo Time-Delay
Listing:
UL Recognized
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse FLM.800 – Frequently Asked Questions

1) Will the Littelfuse FLM fuse fit a standard midget fuse holder?
Yes. The FLM Series is built in the Midget/5AG size, which is the 13/32 x 1-1/2 inch body used by common midget fuse holders and blocks in control panels. Note it is a ferrule fuse with no rejection feature, so it will also drop into a Class CC holder, but a Class CC rejection holder is meant for Class CC fuses and the FLM is not one.
2) Can the FLM fuse be used on a 125VDC control circuit, not just AC?
Yes. The FLM Series carries a dual rating of 250VAC and 125VDC, so the same fuse covers AC control circuits and DC circuits up to 125 volts. The 10,000A interrupting rating is stated at 250VAC.
3) My control transformer fuse keeps blowing on startup. Will a time-delay fuse like the FLM fix it?
That is what the FLM is built for. The Slo-Blo time-delay element rides through the magnetizing inrush of a control transformer or the pull-in surge of a solenoid without opening, while still clearing a sustained overload. A fast-acting fuse of the same amp rating will nuisance-trip on that same inrush.
4) I need branch-circuit protection for a motor, not supplemental. Is the FLM the right fuse?
No. The Littelfuse FLM Series is intended for supplemental protection of small motors and for control circuit transformers and solenoids; for motor branch-circuit protection a Class CC fuse is the correct choice. If the application is a larger 250V feeder or branch circuit, a Class RK1 device such as the Mersen A2K Series fast-acting fuse or the Mersen A2D-R time-delay fuse covers that class of protection instead.
5) What is the difference between the Littelfuse FLM time-delay fuse and the Mersen A2K Series fast-acting fuse at 250V?
Both are 250V rated, but they open differently. The Littelfuse FLM Series uses Slo-Blo time-delay construction so it rides through the momentary inrush of a control transformer or solenoid without opening, and it comes in a Midget/5AG body rated 250VAC/125VDC. The Mersen Amp-Trap A2K Series is a fast-acting Class RK1 fuse rated 250V, which clears overcurrent without an intentional delay. Use the FLM where inrush is expected; use a fast-acting fuse where the load draws no significant startup surge.
6) Can I use a Mersen A2D-R Class RK1 time-delay fuse in place of a Littelfuse FLM?
They share a time-delay characteristic but not a body. The Mersen A2D-R is a Class RK1 time-delay fuse with SmartSpot blown-fuse indication, which is a rejection-style Class RK1 dimension. The Littelfuse FLM Series is a Midget/5AG size fuse, so it fits Midget fuse holders and blocks used in control panels. A Class RK1 fuse will not drop into a Midget clip or holder, so the two are not mechanically interchangeable even where the time-delay behavior matches.
7) What amp ratings does the Littelfuse FLM time-delay fuse come in?
Three fractional ratings: 0.5 A (FLM.500), 0.6 A (FLM.600), and 0.8 A (FLM.800). These are sized for control transformer primaries, solenoid coils, and other low-current loads rather than power circuits.
8) Is the Littelfuse FLM UL listed or UL recognized?
UL Recognized, under file E10480. Recognized components are evaluated for use inside a larger assembly such as a control panel, which is how these fuses are normally applied.
9) Is a 10,000A interrupting rating enough for a commercial control panel?
The FLM Series clears 10,000A at 250VAC, which covers the available fault current at most control circuit taps downstream of a transformer. Where the calculated available fault current at the fuse exceeds that, step up to a fuse with a higher interrupting rating such as a Class RK1 or Class CC device.
10) What should I use instead of the FLM for a medium voltage circuit?
The Littelfuse FLM Series is a low voltage fuse rated 250VAC/125VDC and is not suitable for medium voltage service. For medium voltage transformer protection, the Mersen D0R0 Series Amp-Trap E-rated medium voltage fuse with ferrule terminals is the device built for that duty.
11) Between the Mersen A2K12R and the Littelfuse FLM, which suits a control panel transformer primary?
The Littelfuse FLM Series is the one purpose-built for that job: Slo-Blo time-delay opening for control circuit transformers and solenoids, 250VAC/125VDC, in a Midget/5AG package that fits common control panel fuse blocks. The Mersen A2K12R belongs to the A6K-R Series as a Class RK1 fast-acting fuse, which has no intentional delay and would be more prone to opening on transformer inrush.
How fast can I get the Littelfuse FLM.800 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 FLM.800 come with a warranty?
Absolutely. The Littelfuse FLM.800 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 FLM.800?
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
Why buy the Littelfuse FLM.800 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!