Blade fuse assortment with colour-coded amp ratings

Blown Fuse? How to Find the Right One Without Guessing

Mini and standard blade fuse assortment with printed amp ratings and colour-coded housings

Last updated: 2026-10-21

A blown fuse is a symptom, not the fault. Replace it with the same physical format and the same amp rating printed on the old fuse — never a higher one, because the fuse is sized to protect the wiring, not the device at the end of it. If a new fuse blows again, stop buying fuses and find the short.

This guide covers the three different things people call “a fuse”, how to identify the one you actually need, and which of the listed parts is which.

1. Three different things get called “a fuse”

Almost every wrong order happens between the first two rows of this table. They are not interchangeable, and they are not removed the same way.

Layer What it looks like Typical rating How it comes out
Blade fuse (mini or standard) Coloured plastic body, two flat prongs, amp number moulded into the top 2A to 40A Pulled by hand or with a fuse puller
Multi-block fuse Bolted block, not a pull-out blade; often a single high-current link 30A and above Unbolted, and matched by part number
Main fuse box assembly A whole housing containing several high-current links and terminals Several ratings in one block The assembly is replaced, not one element

If the thing that failed is bolted down and carries a part number, a bag of blade fuses will not fix it. If it pulls out with your fingers, a fuse-box assembly is the wrong purchase.

2. Match the physical format first, then the amps

Two blade fuses can carry the same rating and still not fit the same slot. The physical format is decided by the slot, not by the vehicle model.

  • Mini — the format in the listed assortment measures approximately 11 mm wide × 16 mm high × 4 mm thick. Compare that against the fuse in your hand before ordering.
  • Standard (ATO/ATC size) — taller and wider than mini. The two will not seat in each other's slots.
  • The amp number is moulded into the housing and the housing colour repeats it. Read the number, not the colour: colours are reused across manufacturers.
  • One vehicle can use both formats. Cabin fuse boxes and engine-bay boxes are often different sizes, so “my car takes mini” is only half an answer.
Mini and standard blade fuse formats side by side with amp ratings marked 30A multi block fuse with bolted terminals for a Honda Civic Hybrid Main fuse block assembly showing multiple high-current links and copper contacts

3. Never fit a higher amp fuse

This is the single most expensive mistake in this whole subject, and it is made for a sympathetic reason: the correct fuse blew, so a bigger one feels safer.

  • The fuse protects the wire, not the device. A circuit's wire gauge and its fuse rating are chosen together. Raise the fuse and the wire becomes the weakest link — it heats, the insulation softens, and the damage happens where you cannot see it.
  • A fuse that blows repeatedly is reporting a fault. Dead short, seized motor, chafed loom, water in a connector. Upsizing the fuse converts a cheap repair into a loom repair.
  • “It has not blown yet” is not evidence. An oversized fuse often survives normal use and only fails to protect during the one event it was supposed to catch.

4. How to tell which fuse is actually blown

  1. Look first. Most blade fuses have a translucent body; a broken or melted element is visible. A fuse can also fail invisibly at the base of a prong, so a clean-looking fuse is not proof.
  2. Test both sides with the circuit powered. Blade fuses have two small test tabs on top. With the ignition on, a good fuse shows voltage at both tabs; voltage at one tab only means the element is open.
  3. Use the fuse map, not the size. The lid of the fuse box or the owner's manual lists which fuse feeds which circuit. Guessing by physical size is how people end up checking five fuses and finding none blown.
  4. If the fuse is good, the fault is elsewhere. Relay, ground, switch or the device itself. Replacing a healthy fuse changes nothing.

5. The parts listed here

Prices are USD at the time of writing and change — check the product page for the current figure.

Part What it covers Ratings stated on the listing Listing
330-piece blade fuse assortment Mini and standard blade fuses, two pullers, divided storage case 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, 35A, 40A Blade Fuse Assortment, 330 pcs — $52.91
Multi-circuit fuse block One complete block assembly with a clear inspection cover 125A, 70A, 60A, 40A, 30A, 20A integrated Multi Amp Fuse Block Module — $45.89
Main fuse box assembly Honda Odyssey 2011–2017; part numbers 38233-TK8-A01 and 38233-TKB-A01 Multiple high-current links in one block Main Fuse Box, Odyssey — $57.61
Multi-block fuse B, 30A 2006–2011 Honda Civic Hybrid; part number 38232-SNA-A11 30A 30A Multi Block Fuse, Civic Hybrid — $38.29
Fuse block showing six integrated amp ratings under a clear inspection cover

What the listings do not state

  • The fuse block's vehicle fitment is seller-stated. The listing says Acura TLX and TLX-L. That claim comes from the seller, not from an independent fitment check — compare the ratings and layout against your original assembly before ordering.
  • The two Honda parts are part-number specific. Model year alone will not identify them. Match 38233-TK8-A01 / 38233-TKB-A01 / 38232-SNA-A11 against the number on your existing part.
  • The assortment does not cover everything. It is mini and standard blade formats only — no maxi, cartridge or bolt-down fuses, which is exactly why the other three parts on this page exist.
  • No fuse-puller alternative is included with the single fuses. The two pullers come with the assortment; the individual block fuses are sold on their own.

6. What a new fuse will not fix

  • A short circuit. The new fuse will blow in the same place. That is the circuit telling you it is still faulty.
  • A corroded or heat-damaged fuse-box terminal. High resistance at the contact melts fuses and plastic without any short existing. Look at the socket, not just the fuse.
  • A tired relay or a bad ground. Both produce the same “dead circuit” symptom as a blown fuse.
  • A device that has simply failed. If the fuse tests good with power on both tabs, the fuse was never the problem.

7. Before you order

  • Photograph the old fuse next to a ruler. Format and rating both become obvious, and you avoid ordering the right amps in the wrong body.
  • Read the number moulded into the old part if it is bolted down. For these listings that number is the only reliable fitment field.
  • Check the fuse-box lid map for which slot feeds the dead circuit — and for whether that box uses mini or standard format.

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