Mersen ATQ-14 Midget Time-Dela...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$62.21
Mersen ATQ-14 Midget Time-Delay Fuse, 500VAC Ferrule

Mersen ATQ-14 Midget Time-Delay Fuse, 500VAC Ferrule

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Model: ATQ1-6/10

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

$62.21
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Mersen ATQ-14 Midget Time-Delay Fuse, 500VAC Ferrule

The Mersen ATQ-14 Midget Time-Delay Fuse (Amp-Trap®) is rated 500VAC with ferrule terminals, offered on this page across selectable Motor FLA ratings from 0.25A to 6.25A (0.25A, 0.8A, 1.125A, 1.4A, 1.6A, 2.25A, 2.5A, 6.25A) so electricians can match a compact, reliable fuse to the exact motor full-load amperage on the circuit. Each fuse in this family carries a 10 kA AC max interrupt rating and is designed for use where the available short circuit current does not exceed 10,000A. This series is intended for supplemental protection only and is not for Branch Circuit Protection.

Key Features

  • Motor FLA Ratings: Select from 0.25A, 0.8A, 1.125A, 1.4A, 1.6A, 2.25A, 2.5A, or 6.25A to match the specific motor full-load amperage of the protected circuit.
  • Ferrule Terminals: Tin-plated copper ferrule connections for dependable, low-resistance clip-mount installation across the entire ATQ-14 family.
  • Time-Delay Characteristic: Time-delay speed rating helps ride through momentary motor inrush without nuisance opening, shared by every rating in this family.
  • Voltage Rating: Rated 500V AC per UL for use in AC circuits, regardless of the Motor FLA rating selected.
  • Interrupt Rating: 10 kA AC max I.R./breaking capacity (I1) for supplemental protection where available fault current is at or below 10,000A.
  • Frequency: Rated for 50/60 Hz systems.
  • Body/Insulating Material: GMG body construction for durable insulation and mechanical strength.
  • Fuse Class: Midget class fuse, clip-mounted, common to all Motor FLA options in this family.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • ROHS Compliant: Yes
  • AC or DC: AC
  • Body/Insulating Material: GMG
  • Connection/Terminal Type: Ferrule
  • Mounting: Clip
  • Connection/Terminal Material: Tin-Plated Copper
  • AC Max I.R./Breaking Capacity: I1: 10 kA
  • Frequency (Hz): 50/60 Hz
  • Speed/Characteristic: Time Delay
  • Rated voltage AC UL: 500 V
  • Fuse Class: Midget
  • Motor FLA Options: 0.25A, 0.8A, 1.125A, 1.4A, 1.6A, 2.25A, 2.5A, 6.25A

Typical Applications

  • Motor Circuit Supplemental Protection Sized to Motor FLA
  • Commercial and Industrial Electrical Panels
  • Equipment Protection Where Available Fault Current Does Not Exceed 10,000A
  • Motor Control Centers and Machine Tool Circuits
  • Lighting and Appliance Circuit Supplemental Protection

Why Mersen?

Mersen's Amp-Trap® ATQ-14 Midget fuses combine a rugged GMG body, tin-plated copper ferrule terminals, and a 10 kA interrupt rating to deliver dependable, RoHS-compliant supplemental protection across a full range of Motor FLA ratings for professional electrical work. The shared time-delay characteristic and 500VAC UL rating make this family a trusted choice when specifying compact, code-aware overcurrent protection sized precisely to motor full-load amperage.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Connection Terminal Type:
Ferrule
Mounting Method:
Clip
Connection/Terminal Material:
Tin-Plated Copper
AC Max I.R./Breaking Capacity: I1:
10 kA
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
Speed/Characteristic:
Time Delay
Rated voltage AC UL:
500 V
AC or DC:
AC
Fuse Class:
Midget
Body/Insulating Material:
GMG
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Time-Delay Fuse
Product Material:
GMG
Connection Type:
Ferrule
Configuration:
Clip Mount
Voltage Rating:
500V
Amperage Rating:
0.25A - 6.25A
Standards:
RoHS Compliant
Product Subgroup:
Fuses

Mersen ATQ1-6/10 – Frequently Asked Questions

1) Can the Mersen ATQ-14 midget fuse be used for branch circuit protection?
No. The ATQ-14 Amp-Trap midget time-delay fuse is for supplemental protection only and is not rated for branch circuit protection. If you need branch circuit protection on a motor circuit, step up to a Class CC time-delay fuse such as the Littelfuse CCMR Series. Use the ATQ-14 downstream of a branch device, for control circuits, motor control center taps, machine tool circuits, and similar supplemental duty.
2) Which amp rating of the Mersen ATQ-14 do I order for my motor?
The ATQ-14 family is sized to motor full-load amperage, with eight choices: 0.25A (ATQ1/4), 0.8A (ATQ8/10), 1.125A (ATQ1-1/8), 1.4A (ATQ1-4/10), 1.6A (ATQ1-6/10), 2.25A (ATQ2-1/4), 2.5A (ATQ2-1/2) and 6.25A (ATQ6-1/4). Match the rating to the FLA on the motor nameplate. Everything else, including the 500VAC rating and time-delay characteristic, is the same across all eight.
3) Will a time-delay midget fuse hold on motor inrush, or should I use a fast-acting one?
Time delay is what you want on a motor. The ATQ-14 has a time-delay characteristic so it rides through momentary starting inrush instead of opening on it. A fast-acting midget fuse like the Littelfuse BLF Series clears quickly and suits loads without an inrush surge, but it will nuisance-blow behind a motor start.
4) Will the Mersen ATQ-14 drop into my existing midget fuse clips?
It is a Midget class fuse with ferrule terminals and clip mounting, so it seats in standard midget fuse clips and clip-style holders. The ferrules are tin-plated copper for a low-resistance connection. It is not a bolt-on or blade-terminal fuse.
5) If the available fault current at the panel is above 10,000A, is the Mersen ATQ-14 still the right fuse?
No. The ATQ-14 family carries a 10 kA AC maximum interrupting rating and is intended for use where available short circuit current does not exceed 10,000A. Above that, move to a fuse class rated for higher fault current and for branch circuit duty - the Littelfuse CCMR040 is a Class CC time-delay fuse, a branch-circuit class, available at 40A. Verify the holder and the amperage against the motor and the system fault current before ordering.
6) What is the closest alternative to the Mersen ATQ-14 midget time-delay fuse if a branch circuit needs protecting instead of supplemental protection?
The Mersen ATQ-14 is a midget-class, 500VAC, time-delay fuse intended for supplemental protection and explicitly not for branch circuit protection. Where branch circuit protection is required, the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A - Class CC is a branch-circuit fuse class, and it shares the time-delay characteristic, so motor inrush behavior is similar in concept while the class and amperage are entirely different. Confirm the holder accepts Class CC rejection-style ferrules, which midget clips do not.
7) Can a Littelfuse BLF midget fuse replace a Mersen ATQ-14?
They are both midget-class fuses, so the physical clip mounting is the same family, but they are not interchangeable electrically. The Mersen ATQ-14 is a time-delay fuse rated 500V AC, while the Littelfuse BLF series is a midget fast-acting fuse rated 250V, with a laminated tube body against the ATQ-14's GMG body. A fast-acting midget on a motor circuit sized to motor full-load amperage will tend to open on inrush, and the 250V rating cannot be used on a 480V system.
8) Can I substitute a Littelfuse midget fuse for the Mersen ATQ-14 in a 250V control panel?
Watch the characteristic and the voltage. The ATQ-14 is a 500VAC time-delay midget. The Littelfuse BLF Series is also a midget but it is fast-acting and rated 250V, so it is not an equivalent on a motor circuit and cannot be applied above its own voltage rating. Glass-tube fuses such as the Littelfuse AGA and AGU series are a different body style entirely and are not midget clip replacements.
9) Can I standardize one ATQ-14 amp rating across all the motors in my building?
Not safely. The ATQ-14 is sized to each motor's full-load amperage, and the eight ratings run from 0.25A to 6.25A. Standardizing on one value would either oversize protection on the small motors or nuisance-open on the larger ones. What you can standardize is the holder: every rating uses the same Midget clip-mount ferrule body, so one clip style carries your whole range of spares.
10) Is a Littelfuse AGA or AGU glass fuse an equivalent to the Mersen ATQ-14?
No. The Mersen ATQ-14 is a midget-class time-delay fuse with tin-plated copper ferrule terminals, a GMG body, clip mounting, and a 10 kA AC interrupting rating for supplemental protection on motor circuits. The Littelfuse AGA5 is a 5A AGA-series glass fuse and the Littelfuse AGU series is an AG glass tube fuse - glass-body automotive/appliance style cartridges in different dimensional families. They may look similar in a drawer but will not seat correctly in midget fuse clips, and they are not a substitute where a 500VAC midget time-delay fuse is specified.
11) What should be used instead of a Mersen ATQ-14 for metering circuits rather than motor loads?
The Mersen ATQ-14 is sized to motor full-load amperage from 0.25A through 6.25A with a time-delay characteristic that rides through motor inrush. For instrument and metering duty, the Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses supplied specifically for PowerLogic energy meters, so it matches the meter's own fusing requirement and the higher 600V rating rather than the ATQ-14's 500V AC rating.
12) Is the Mersen ATQ-14 RoHS compliant for a spec job?
Yes, the ATQ-14 is RoHS compliant across the family, which is what most institutional and government electrical specs ask for on fuse submittals.
13) What is the Mersen ATQ-14 fuse body made of, and does it hold up in an industrial panel?
The body is GMG insulating material, which gives the fuse its dielectric insulation and mechanical strength in panel service. Combined with the tin-plated copper ferrules, it is built for commercial and industrial panels, motor control centers, and machine tool circuits.
How fast can I get the Mersen ATQ1-6/10 delivered?
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Can I return it if it doesn’t work for me?
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Does the Mersen ATQ1-6/10 come with a warranty?
Absolutely. The Mersen ATQ1-6/10 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 ATQ1-6/10?
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