Littelfuse 155400 ATO In-Line ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$7.51
Littelfuse 155400 ATO In-Line Fuseholder, 155 Series 20A

Littelfuse 155400 ATO In-Line Fuseholder, 155 Series 20A

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Model: 155400

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

$7.51
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Littelfuse 155400 ATO In-Line Fuseholder, 155 Series 20A

The Littelfuse 155400 is an ATO in-line fuseholder from the Littelfuse 155 Series, engineered to accept standard ATO (257) blade-type fuses for reliable overcurrent protection in low-voltage circuits. Rated 32VAC / 32VDC with a 20A ampere rating, this in-line mount fuseholder provides a compact, secure connection point that splices directly into a wire run for automotive, industrial, and OEM wiring applications. The 155 Series is built around simple in-line installation, giving electricians and panel builders a fast way to add serviceable fuse protection to an existing circuit without a panel cutout. Because the fuseholder mounts in-line rather than on a panel, it can be positioned wherever the circuit needs protection, and the ATO (257) blade fuse interface keeps fuse replacement quick for maintenance technicians working in the field.

Key Features

  • Ampere Rating: 20A rating supports dependable overcurrent protection for the connected circuit.
  • Voltage Rating: Rated 32VAC / 32VDC, suited to low-voltage automotive and industrial fuse circuits.
  • In-Line Mounting: In-Line mounting method allows the fuseholder to be spliced directly into a wire run without panel cutouts.
  • ATO Fuse Compatibility: Designed to accept ATO (257) blade-style fuses for quick, secure fuse seating and easy replacement.
  • 155 Series Design: Part of the Littelfuse 155 Series fuseholder and panel mount holder component lineup.
  • Compact Profile: Space-saving in-line body suited to tight wire harness and enclosure routing.
  • Field Serviceable: In-line access simplifies fuse inspection and replacement during maintenance.

Technical Specifications

  • VAC (V): 32
  • VDC (V): 32
  • Ampere Rating (A): 20

Typical Applications

  • Automotive Electrical Circuits
  • Industrial Control and Machine Wiring
  • In-Line Fuse Protection for Wire Harnesses
  • OEM Electrical Assemblies
  • Low-Voltage DC Power Distribution
  • Panel-Free Fuse Installations Where Space Is Limited

Why Littelfuse?

Littelfuse builds the 155 Series fuseholder line for consistent, dependable overcurrent protection in demanding automotive and industrial circuits. The 155400 in-line fuseholder pairs a rugged, compact construction with straightforward ATO (257) fuse compatibility, giving electrical professionals an easy-to-service connection point for 32VAC / 32VDC, 20A circuits. Choosing a Littelfuse 155 Series fuseholder means standardizing on a single ATO-compatible in-line platform across a facility or fleet, simplifying spare-parts stocking and fuse replacement procedures for maintenance teams.

Product Specs

Product Type:
Fuseholder
Series:
155
Configuration:
In-Line
Voltage Rating:
32VAC/32VDC
Amperage Rating:
20A
Department:
Electrical
Product Group:
Wiring Devices

Littelfuse 155400 – Frequently Asked Questions

1) What kind of fuse does the Littelfuse 155400 in-line fuseholder take?
It takes standard ATO (257) blade-type fuses, the common automotive blade fuse. That means a maintenance tech can pull and replace the fuse by hand in the field without tools or rewiring, and you can stock one fuse type across a fleet or facility. The holder is rated for up to 20A, so don't put a blade fuse larger than 20A in it.
2) Can I use this fuseholder on a 120V circuit?
No. The 155400 is a low-voltage holder rated 32VAC / 32VDC only. It is built for 12V and 24V automotive, OEM harness, and low-voltage DC distribution work. For line-voltage branch circuit protection you need a holder rated for that system voltage instead.
3) Does this fuseholder need a panel cutout or a mounting bracket?
Neither. The 155400 is an in-line configuration, so it splices directly into an existing wire run and hangs in the harness. No enclosure hole, no panel real estate, no mounting screws. That is the main reason to pick it over a panel-mount holder from the same 155 Series family: you can place the protection at the point in the run where you want it rather than at the panel.
4) Should I use an in-line fuseholder or a panel mount holder for machine wiring?
Use in-line, like the 155400, when the circuit already exists and you are adding serviceable protection to it, or when the enclosure has no free space for a cutout. Use a panel mount holder when you want the fuse visible and accessible from the face of a control panel and you are building the panel from scratch. Both approaches exist in the Littelfuse 155 Series; the deciding factor is whether you can cut and dedicate panel space.
5) Is the 20A rating the fuse size or the holder's limit?
20A is the holder's ampere rating, the maximum it is built to carry. You can run any ATO blade fuse at or below that value in it, sized to the load and conductor you are protecting. Do not treat the 20A marking as a requirement to install a 20A fuse.
6) Is the Littelfuse 155400 suitable for a 24V DC industrial control circuit?
Yes. At 32VDC the holder covers both 12V and 24V DC systems, which is why it shows up in industrial control and machine wiring as well as automotive harnesses. Keep the connected load at or under 20A.
How fast can I get the Littelfuse 155400 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 155400 come with a warranty?
Absolutely. The Littelfuse 155400 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 155400?
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 155400 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.
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