Our Verdict
Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack — 9.2/10. A reliable, practical ATO blade fuse assortment for DIYers, garages, vehicles, marine gear, and common 12-volt electrical systems.
ATO blade fuses are small, inexpensive parts, but having the right amperage on hand can save a stalled repair, a disabled accessory, or a frustrating trip to the auto parts store. The Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack from Littelfuse is built for homeowners, DIY mechanics, and workshop users who want a practical range of replacement fuses in one kit.
This guide focuses on the exact catalog product: the Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack, model 00940400Z, and explains where it fits, who should buy it, and what to check before replacing a fuse.
Best overall: Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack — 9.2/10
A reliable, versatile ATO blade fuse assortment for garages, vehicles, marine gear, and 12-volt electrical systems where multiple common amperage ratings are useful to keep on hand.
Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack
The Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack is designed for anyone who regularly deals with automotive-style electrical protection. Instead of buying individual fuses one rating at a time, this assortment gives you a practical spread of common amperages from 5 to 30 amps. That makes it especially useful for home garages, workshops, vehicle emergency kits, and general 12-volt troubleshooting.
Littelfuse is a well-known manufacturer in circuit protection, and that matters with fuses. A fuse is a safety component, not just a convenience item: it is intended to open the circuit when current exceeds the rated level. Using a correctly rated, properly sized replacement fuse helps protect wiring, accessories, and electrical panels from damage caused by overcurrent conditions.
This pack is best for users who need standard ATO-style blade fuses. ATO fuses are commonly found in many automotive, marine, powersports, trailer, and auxiliary 12-volt applications, but compatibility should always be verified against the fuse panel, owner’s manual, or the fuse being replaced. The physical blade style and amp rating both need to match the original application.
The biggest advantage of this assortment is readiness. If you maintain older vehicles, add accessories, troubleshoot electrical issues, or keep spare parts in a toolbox, having 5, 10, 15, 20, 25, and 30 amp coverage can prevent delays. It is not a diagnostic tool by itself, though: if a replacement fuse blows repeatedly, the underlying short, overload, or component fault needs to be found before installing another fuse.
| Specification | Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack |
|---|---|
| Model number | 00940400Z |
| Fuse style | ATO blade fuse |
| Amperage range | 5 to 30 amps |
| Primary use cases | Automotive, garage, workshop, marine, and 12-volt electrical systems |
| Best for | DIYers who want a ready assortment of common replacement fuse ratings |
| Product category | Circuit Breakers & Fuses |
Pros
- Covers a useful 5 to 30 amp range for common ATO fuse replacements
- Good fit for home garages, vehicle toolkits, workshops, and 12-volt projects
- Made by Littelfuse, a recognized name in circuit protection
- Reduces the need to buy multiple individual fuse ratings separately
- Standard ATO blade format supports straightforward replacement in compatible fuse blocks, such as the
This standard ATO blade format supports straightforward replacement in compatible fuse blocks, such as the Blue Sea Systems 6-Circuit ST Blade Fuse Block with Cover.
Cons
- Only appropriate for systems that use ATO-style blade fuses
- Not a substitute for diagnosing why a fuse blew in the first place
- May not include lower, higher, mini, micro, or cartridge fuse types needed by some vehicles
- Users must still match the original fuse rating exactly
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| Product | Pick | Fuse type | Amp range | Best use | Key limitation |
|---|---|---|---|---|---|
| Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack | Best overall | ATO blade fuse | 5-30 amps | General automotive, marine, garage, and 12-volt replacement needs | Must match ATO fuse size and exact amp rating required by the circuit |
How we chose
Because this guide covers one specific catalog product, the evaluation focuses on suitability, practicality, and correct use rather than ranking unrelated models. The Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack was assessed for its amperage coverage, common-use compatibility, manufacturer reputation, and usefulness for homeowners and DIYers.
We prioritized products that solve a real maintenance problem: keeping the right fuse ratings available before a vehicle, trailer, accessory, or 12-volt device is out of service. A broad assortment is especially valuable when it includes commonly used ratings and comes in a standard form factor that is easy to identify and replace.
We also considered safety and limitations. A fuse should always be replaced with the same type and amp rating specified by the equipment manufacturer. Installing a higher-rated fuse to stop repeated failures can create a fire or wiring-damage hazard (see our Blue Sea Systems 5193 Review for alternative marine DC protection options), so this pack is best viewed as a replacement assortment, not a workaround for an electrical fault.
Never replace a blown fuse with a higher amp rating unless the equipment manufacturer specifically calls for it. If the same fuse blows again, stop replacing it and diagnose the circuit.
Final pick: Littelfuse ATO 5-30 Amp Blade Fuse Assortment Pack
For a practical, garage-ready set of common ATO blade fuse ratings, the Littelfuse 00940400Z assortment is the right choice for DIYers who maintain vehicles, marine equipment, trailers, or other 12-volt systems.
What does ATO mean on a blade fuse?
ATO refers to a standard automotive blade fuse style. It has two flat metal blades and a plastic body, and it is commonly used in vehicle and 12-volt fuse panels. Before replacing a fuse, confirm that your fuse box requires ATO rather than mini, micro, low-profile, cartridge, or another fuse format.
Can I use a 20 amp fuse to replace a 15 amp fuse?
No, not unless the equipment manufacturer specifies that rating for the circuit. A fuse protects wiring and components by opening at a defined current level. Using a higher amp fuse can allow too much current through the circuit and may create a fire or damage risk.
Who should buy the Littelfuse 00940400Z fuse assortment?
It is a good fit for homeowners, DIY mechanics, boat owners, trailer owners, and workshop users who regularly maintain equipment that uses ATO blade fuses. It is especially useful if you want several common ratings available instead of buying individual replacements one at a time.
Why did my replacement fuse blow immediately?
If a new fuse blows right away, the circuit may have a short, overload, damaged wire, faulty accessory, or component failure. Do not keep installing new fuses repeatedly. Troubleshoot the circuit or have it inspected before replacing the fuse again.
Is this pack only for cars?
No. ATO blade fuses are common in many 12-volt systems, including some marine, powersports, trailer, RV, and accessory circuits. The key requirement is compatibility: the fuse style, physical size, voltage application, and amp rating must match the equipment’s specifications.
