Littelfuse FLM Series 250V/125...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$11.24
Littelfuse FLM Series 250V/125VDC Time-Delay Midget Fuse

Littelfuse FLM Series 250V/125VDC Time-Delay Midget Fuse

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Model: FLM01.6

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

$11.24
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Littelfuse FLM Series 250V/125VDC Time-Delay Midget Fuse

The Littelfuse FLM Series is a line of time-delay (Slo-Blo/Time Lag) midget-style fuses rated 250VAC and 125VDC, engineered to protect control circuit transformers, solenoids, and other circuits that experience high inrush currents. Available in ampere ratings from 1A to 20A across 17 options, the FLM Series is housed in the compact Midget/5AG package size and carries a 10,000A interrupting rating at 250VAC, giving it the ride-through needed to absorb momentary current surges without nuisance opening. It is an excellent choice for supplemental protection of small motors in control panels, machine builds, and OEM equipment where dependable, precisely rated overcurrent protection is required. Electricians, panel shops, and maintenance technicians can select the correct FLM Series ampere rating as a like-for-like replacement when servicing equipment that specifies a time-delay midget fuse.

Key Features

  • Ampere Rating Range: Available from 1A to 20A across 17 ratings, sized for control circuit transformers, solenoids, and other high-inrush-current loads that need a fuse rated to hold through startup surges.
  • Dual Voltage Rating: Rated 250VAC and 125VDC, giving specifiers flexibility across AC and DC control circuit applications without changing fuse families.
  • Time-Delay Operation: Slo-Blo/Time Lag (T)/Time Delay opening characteristic rides through momentary inrush spikes at energization to prevent nuisance blowing during normal startup events.
  • Interrupting Rating: 10,000A @ 250VAC interrupting rating for safe, reliable clearing of fault currents in the circuits it protects.
  • Compact Package Size: Midget/5AG form factor fits standard midget fuse holders, fuse blocks, and control panel fuse terminals for straightforward installation and replacement.
  • Supplemental Motor Protection: Excellent for supplemental protection of small motors; for motor branch-circuit protection, Littelfuse recommends Class CC fuses instead of the FLM Series.

Technical Specifications

  • Series: FLM
  • VAC (V): 250
  • VDC (V): 125
  • Interrupting Rating: 10,000A @ 250VAC
  • Ampere Rating Range: 1A - 20A (17 options)

Typical Applications

  • Control Circuit Transformers
  • Solenoid Circuits
  • High Inrush Current Circuits
  • Supplemental Small Motor Protection
  • Industrial Control Panels and Machine Builds
  • OEM Equipment Requiring Time-Delay Overcurrent Protection

Why Littelfuse?

Littelfuse engineers the FLM Series to deliver precise, time-delay overcurrent protection for control circuits that see momentary inrush at startup, backing the series with a clearly defined 250VAC/125VDC voltage rating and a 10,000A interrupting rating for dependable fault clearing across all 17 ampere ratings. The compact Midget/5AG package keeps installation straightforward in existing fuse holders and blocks, while the 1A to 20A rating range covers control transformers, solenoids, and small motor circuits. Choosing the correctly rated Littelfuse FLM Series fuse helps electrical professionals keep control circuits protected while supporting reliable, code-aware electrical design across commercial and industrial installations.

Product Specs

Series:
FLM
Product Type:
Time-Delay Fuse
Voltage Rating:
250VAC / 125VDC
Amperage Rating:
1A - 20A
Configuration:
Midget (5AG)
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse FLM01.6 – Frequently Asked Questions

1) Can I use a Littelfuse FLM midget fuse for motor branch-circuit protection?
No. The FLM Series is intended for supplemental protection of small motors only. For motor branch-circuit protection, Littelfuse recommends Class CC fuses instead of the FLM Series. Use the FLM where you need a time-delay midget fuse on control transformers, solenoids, and other high-inrush control circuits.
2) Will a Littelfuse FLM fuse fit my existing midget fuse holder?
Yes, if the holder takes a standard midget fuse. The FLM Series is built in the Midget/5AG package, which drops into standard midget fuse holders, fuse blocks, and control panel fuse terminals without any change to the block.
3) Is the FLM Series rated for DC control circuits, not just 120/240V AC?
Both. The FLM carries a dual rating of 250VAC and 125VDC, so the same fuse family covers AC control circuits and DC circuits up to 125 volts. Note the interrupting rating of 10,000A is stated at 250VAC.
4) My control transformer fuse keeps blowing on startup. Will a time-delay FLM fix that?
That is what the FLM is for. It is a Slo-Blo / Time Lag (T) time-delay element, so it rides through the momentary inrush spike when a control transformer or solenoid is energized instead of opening on it. If the fuse is still opening after the surge window, the problem is load current or a fault, not the fuse characteristic.
5) Is the FLM a like-for-like replacement when I am servicing a machine that specifies a time-delay midget fuse?
Yes, provided the amperage matches and the circuit voltage is within 250VAC or 125VDC. The FLM is the time-delay midget fuse electricians and panel shops use as a straight swap in that situation. Match the printed amp rating on the old fuse to the corresponding FLM part number rather than rounding up.
6) What is the difference between a Littelfuse FLM midget fuse and a Mersen A2D-R Class RK1 fuse?
Both are time-delay fuses, but they are different form factors and different classes. The Littelfuse FLM is a Midget (5AG) package rated 250VAC/125VDC with ampere ratings from 1A to 20A, sized for control transformers, solenoids, and supplemental small motor protection. The Mersen A2D-R is a Class RK1 time-delay fuse rated 250VAC/250VDC with SmartSpot blown-fuse indication, and it mounts in Class RK fuse clips rather than midget holders. If the panel drawing calls for a Class RK1 rejection-style fuse, the FLM will not fit or satisfy it; if the equipment specifies a time-delay midget, the FLM is the like-for-like part.
7) I need a time-delay fuse above 20A - what do I use instead of the FLM series?
The Littelfuse FLM series tops out at 20A, so for a larger time-delay fuse you move to a different class and body size. The Mersen A2D400R is a Class RK1 time-delay fuse rated 400A with SmartSpot indication, which covers main and feeder duty well beyond what a midget body handles. Confirm your holder or fuse block is Class RK1 clip style before ordering, since it will not accept a midget fuse.
8) What amp ratings does the Littelfuse FLM midget fuse come in?
Seventeen ratings spanning 1A to 20A: 1, 1.125, 1.5, 1.6, 1.8, 2, 2.5, 3, 3.2, 3.5, 4.5, 5, 6.25, 8, 10, 12, and 20 amps. The fractional sizes (FLM1.12, FLM01.6, FLM6.25 and the rest) matter when you are matching a control transformer primary that was originally fused between the whole-amp steps.
9) How do I order the right FLM part number for a given amperage?
The part number carries the rating: FLM001 is 1A, FLM005 is 5A, FLM010 is 10A, FLM020 is 20A, and the decimal sizes read as FLM01.6 for 1.6A, FLM03.2 for 3.2A and FLM6.25 for 6.25A. Watch the two that look alike, FLM015 is the 1.5A fuse and FLM025 is the 2.5A fuse, so read the decimal, not just the digits.
10) Is a 10,000A interrupting rating enough for an industrial control panel?
The FLM clears 10,000A at 250VAC, which covers the available fault current on most control circuits fed from a control power transformer. Where your short-circuit study shows available fault current above that at the fuse, or where you are protecting a main or feeder rather than a control circuit, you need a higher-interrupting class fuse, for example a Class RK1 time-delay such as the Mersen A2D-R series.
11) Can I drop an FLM fuse into a Class CC fuse holder?
Not reliably. Class CC fuses use a rejection feature at one end that midget blocks do not have, and the FLM is a plain Midget/5AG body. It goes into a non-rejection midget holder. If the equipment specifies Class CC, use a Class CC fuse, which is also what Littelfuse calls for on motor branch circuits.
12) Can I use a Mersen Amp-Trap 2000 A2D-R fuse in place of a Littelfuse FLM in a control panel?
Not as a drop-in. The Mersen A2D-R belongs to the Amp-Trap 2000 family and is a Class RK1 time-delay fuse, a larger body that seats in Class RK fuse clips. The Littelfuse FLM is a Midget (5AG) fuse that fits standard midget holders, blocks, and control panel fuse terminals. The two share a time-delay characteristic but not mounting, so a swap means changing the fuse block as well.
13) Is the Mersen D0R0 Amp-Trap fuse an alternative to the Littelfuse FLM?
No. The Mersen D0R0 series Amp-Trap is an E-rated medium voltage fuse with ferrule terminals, intended for medium voltage transformer and feeder protection. The Littelfuse FLM is a low voltage fuse rated 250VAC/125VDC for control circuits, solenoids, and supplemental small motor protection. They serve entirely different voltage classes and are not interchangeable in either direction.
14) My meter needs a small fuse - should I order a 1A Littelfuse FLM or the Square D PowerLogic fuse pack?
Match the fuse to the device. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses supplied for PowerLogic metering circuits. The Littelfuse FLM starts at 1A and is rated 250VAC/125VDC, so it neither reaches the 600V rating nor the 0.5A value that metering pack provides. For a PowerLogic meter, use the meter fuse pack; use the FLM for 250V control circuits that specify a time-delay midget.
How fast can I get the Littelfuse FLM01.6 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 FLM01.6 come with a warranty?
Absolutely. The Littelfuse FLM01.6 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 FLM01.6?
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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