{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "automotive-blade-fuses-iso-8820-3",
 "name": "Automotive blade fuses (ISO 8820-3 / SAE J1284): Micro2, Micro3, low-profile mini, mini ATM, regular ATO/ATC, maxi: body width, thickness, height",
 "kind": "standard",
 "category": "Electronics",
 "group": "Wiring & connectors",
 "year": null,
 "question": "What are the dimensions of Micro2, Micro3, mini (ATM), low-profile mini, regular (ATO / ATC) and maxi automotive blade fuses, and what is the blade spacing?",
 "tags": [
  "fuse",
  "blade fuse",
  "automotive",
  "ato",
  "atc",
  "atm",
  "micro2",
  "maxi",
  "iso 8820-3",
  "sae j1284",
  "fuse holder"
 ],
 "aliases": [
  "blade fuse dimensions",
  "ato fuse size",
  "atc fuse dimensions",
  "atm mini fuse dimensions",
  "micro2 fuse dimensions",
  "micro3 fuse size",
  "low profile mini fuse size",
  "maxi fuse dimensions",
  "car fuse size chart",
  "automotive fuse sizes",
  "blade fuse blade spacing",
  "standard blade fuse 19.1 mm",
  "mini blade fuse 10.9 mm",
  "iso 8820-3",
  "sae j1284",
  "apt atr fuse",
  "apm atm fuse",
  "apx maxi fuse size",
  "fuse box slot size"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/automotive-blade-fuses-iso-8820-3/",
 "sheet_txt": "https://xemstudio.com/objects/automotive-blade-fuses-iso-8820-3/sheet.txt",
 "sheet": {
  "basis": "Wikipedia/YourSpec blade fuse table cross-checked with Wiltronics labelled pages and a Bussmann ATM listing; blade spacing only where a labelled value was readable; McMaster-Carr linked for CAD",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Blade (tab) fuses are named by body size: Micro2, Micro3, low-profile mini, mini (ATM), regular (ATO / ATC) and maxi. The road-vehicle fuse-link standard is ISO 8820, whose part 3 covers fuse-links with tabs (blade type); the ATO / ATC regular size is the SAE J1284 form. Littelfuse's MICRO2 page cites 'SAE 2741-1 and ISO 8820-12:2020' for that size, so the part numbers differ between sizes. Check the part you hold against the standard edition your holder was made to.",
   "Body width, thickness and height: the Wikipedia (and YourSpec) table prints each as L x W x H; the three sizes Wiltronics lists agree and label them width, depth and height (regular 19.1 / 5.1 / 18.5, maxi 29.2 / 8.5 / 34.3, mini 10.9 / 3.6 / 16.3). Micro2, Micro3 and LP-mini come from the Wikipedia / YourSpec table only.",
   "Where sources disagree: the ATM mini thickness. Wikipedia and Wiltronics print 3.6 mm; a Bussmann ATM 15 listing gives 0.150 in (3.81 mm) with 0.430 in (10.92 mm) width and 0.642 in (16.31 mm) height, and the Eaton data sheet's readable numbers (.430, .15) agree with the listing. Both are shown; the 3.6 may be a rounded or per-maker value. The LP-mini thickness 3.81 is the Wikipedia figure (the Littelfuse LP-mini sheet's drawing numbers 3.8, 10.9 and 8.4 are unlabelled in the copy read).",
   "Blade spacing is the centre-to-centre distance of the two blades, which sets the holder slot. Only two values could be read with a label: Micro2 5.0 mm (Prolec catalogue text: 'a smaller 5.0 mm centerline spacing') and ATC / ATO 5.08 mm (0.2 in). Blade width and thickness for all six sizes are printed in outline drawings that the reader could not turn into labelled numbers, so they are left out rather than guessed.",
   "No files: a fuse with blades is not fully defined by the body numbers, and a plain body block is not a useful model. Left out: current ratings and colour codes, voltage ratings (32 V and 58 V versions), blade length and width, the sub-miniature three-blade types and ATO-F flange versions.",
   "McMaster-Carr stocks ATO, ATM and maxi fuses and holders with free per-part STEP/IGES; the category links are below (linked only, not hosted here)."
  ],
  "table": {
   "columns": [
    "fuse size",
    "blade group codes (maker names)",
    "body width, mm",
    "body thickness (depth), mm",
    "height, mm (body + blades, as listed)",
    "blade spacing, mm"
   ],
   "rows": [
    [
     "Micro2",
     "APT, ATR",
     "9.1",
     "3.8",
     "15.3",
     "5.0 (Prolec catalogue text)"
    ],
    [
     "Micro3",
     "ATL",
     "14.4",
     "4.2",
     "18.1",
     "not read"
    ],
    [
     "Low-profile mini (LP-mini)",
     "APS, ATT",
     "10.9",
     "3.81",
     "8.73",
     "not read"
    ],
    [
     "Mini (ATM)",
     "APM, ATM",
     "10.9",
     "3.6",
     "16.3",
     "not read"
    ],
    [
     "Regular / standard (ATO, ATC)",
     "APR, ATC, ATO, ATS",
     "19.1",
     "5.1",
     "18.5",
     "5.08 (0.2 in; SpecFits)"
    ],
    [
     "Maxi",
     "APX",
     "29.2",
     "8.5",
     "34.3",
     "not read"
    ]
   ]
  }
 },
 "sheet_text": "Automotive blade fuses (ISO 8820-3 / SAE J1284): Micro2, Micro3, low-profile mini, mini ATM, regular ATO/ATC, maxi: body width, thickness, height — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/automotive-blade-fuses-iso-8820-3/  (sheet CC BY 4.0)\nBasis: Wikipedia/YourSpec blade fuse table cross-checked with Wiltronics labelled pages and a Bussmann ATM listing; blade spacing only where a labelled value was readable; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Blade (tab) fuses are named by body size: Micro2, Micro3, low-profile mini, mini (ATM), regular (ATO / ATC) and maxi. The road-vehicle fuse-link standard is ISO 8820, whose part 3 covers fuse-links with tabs (blade type); the ATO / ATC regular size is the SAE J1284 form. Littelfuse's MICRO2 page cites 'SAE 2741-1 and ISO 8820-12:2020' for that size, so the part numbers differ between sizes. Check the part you hold against the standard edition your holder was made to.\n- Body width, thickness and height: the Wikipedia (and YourSpec) table prints each as L x W x H; the three sizes Wiltronics lists agree and label them width, depth and height (regular 19.1 / 5.1 / 18.5, maxi 29.2 / 8.5 / 34.3, mini 10.9 / 3.6 / 16.3). Micro2, Micro3 and LP-mini come from the Wikipedia / YourSpec table only.\n- Where sources disagree: the ATM mini thickness. Wikipedia and Wiltronics print 3.6 mm; a Bussmann ATM 15 listing gives 0.150 in (3.81 mm) with 0.430 in (10.92 mm) width and 0.642 in (16.31 mm) height, and the Eaton data sheet's readable numbers (.430, .15) agree with the listing. Both are shown; the 3.6 may be a rounded or per-maker value. The LP-mini thickness 3.81 is the Wikipedia figure (the Littelfuse LP-mini sheet's drawing numbers 3.8, 10.9 and 8.4 are unlabelled in the copy read).\n- Blade spacing is the centre-to-centre distance of the two blades, which sets the holder slot. Only two values could be read with a label: Micro2 5.0 mm (Prolec catalogue text: 'a smaller 5.0 mm centerline spacing') and ATC / ATO 5.08 mm (0.2 in). Blade width and thickness for all six sizes are printed in outline drawings that the reader could not turn into labelled numbers, so they are left out rather than guessed.\n- No files: a fuse with blades is not fully defined by the body numbers, and a plain body block is not a useful model. Left out: current ratings and colour codes, voltage ratings (32 V and 58 V versions), blade length and width, the sub-miniature three-blade types and ATO-F flange versions.\n- McMaster-Carr stocks ATO, ATM and maxi fuses and holders with free per-part STEP/IGES; the category links are below (linked only, not hosted here).\n\nfuse size  blade group codes (maker names)  body width, mm  body thickness (depth), mm  height, mm (body + blades, as listed)  blade spacing, mm\nMicro2  APT, ATR  9.1  3.8  15.3  5.0 (Prolec catalogue text)\nMicro3  ATL  14.4  4.2  18.1  not read\nLow-profile mini (LP-mini)  APS, ATT  10.9  3.81  8.73  not read\nMini (ATM)  APM, ATM  10.9  3.6  16.3  not read\nRegular / standard (ATO, ATC)  APR, ATC, ATO, ATS  19.1  5.1  18.5  5.08 (0.2 in; SpecFits)\nMaxi  APX  29.2  8.5  34.3  not read\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia (mirror): Fuse (automotive): blade fuse table, L x W x H for Micro2, Micro3, LP-Mini, Mini, Regular, Maxi — web — Publisher's page; dimensions are facts — https://ipfs.ssi.eecc.de/ipns/en.wikipedia-on-ipfs.org/wiki/Fuse_(automotive)\n- YourSpec: Blade fuses: the same L x W x H table — web — Publisher's page; dimensions are facts — https://aww.yourspec.com/Blade_Fuses\n- Wiltronics: Blade fuse ATC regular: width 19.1, height 18.5, depth 5.1 — web — Publisher's page; dimensions are facts — https://wiltronics.com.au/?p=43953\n- Wiltronics: Maxi blade fuse: full width 29.2, height 34.3, depth 8.5 — web — Publisher's page; dimensions are facts — https://wiltronics.com.au/?p=56076\n- Wiltronics: Mini blade fuse: width 10.9, height 16.3, depth 3.6 — web — Publisher's page; dimensions are facts — https://www.wiltronics.com.au/?p=43824\n- Bussmann ATM-15 retailer listing: Bussmann ATM 15 A: 0.430 in length x 0.150 in width x 0.642 in height — web — Publisher's page; dimensions are facts — https://www.basupply.com/Cooper-Bussmann-ATM-15-Bussmann-ATM-15-Fast-Acting-Mini-Blade-Fuse-15-Amp-32-Volt-DC/p1942714\n- Eaton / Bussmann: ATM fast-acting mini blade fuse data sheet (dimension labels not machine-readable; numbers .430 in, .15 in agree with the listing) — web — Publisher's page; dimensions are facts — https://static.datasheets.com/doc/18968552-eaton-atm-4-ds.pdf\n- automotivefuses.com.au (Prolec catalogue): Blade fuse catalogue: Micro2 with a 5.0 mm centerline spacing — web — Publisher's page; dimensions are facts — https://automotivefuses.com.au/amfile/file/download/file/29/product/16731\n- SpecFits: ATC / ATO blade fuse: blade spacing 5.08 mm (0.2 in), SAE J1284 — web — Publisher's page; dimensions are facts — https://specfits.pages.dev/fuses/atc\n- Littelfuse: MICRO2 series page: complies with SAE 2741-1 and ISO 8820-12:2020, 0.53 g — web — Publisher's page; dimensions are facts — https://littelfuse.com/products/fuses/automotive-aftermarket-products/blade-fuses/micro2.aspx\n- McMaster-Carr: Automotive fuses (overview) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/fuses/automotive-fuses/\n- McMaster-Carr: ATO blade fuses (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/littelfuse-type-ato-fuses\n- McMaster-Carr: ATM mini blade fuses (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/bussmann-type-atm-fuses\n- McMaster-Carr: Mini fuses (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/mini-fuses\n- McMaster-Carr: Maxi fuses (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/maxi-fuses\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=automotive-blade-fuses-iso-8820-3\n",
 "sources": [
  {
   "publisher": "Wikipedia (mirror)",
   "title": "Fuse (automotive): blade fuse table, L x W x H for Micro2, Micro3, LP-Mini, Mini, Regular, Maxi",
   "url": "https://ipfs.ssi.eecc.de/ipns/en.wikipedia-on-ipfs.org/wiki/Fuse_(automotive)",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "YourSpec",
   "title": "Blade fuses: the same L x W x H table",
   "url": "https://aww.yourspec.com/Blade_Fuses",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wiltronics",
   "title": "Blade fuse ATC regular: width 19.1, height 18.5, depth 5.1",
   "url": "https://wiltronics.com.au/?p=43953",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wiltronics",
   "title": "Maxi blade fuse: full width 29.2, height 34.3, depth 8.5",
   "url": "https://wiltronics.com.au/?p=56076",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wiltronics",
   "title": "Mini blade fuse: width 10.9, height 16.3, depth 3.6",
   "url": "https://www.wiltronics.com.au/?p=43824",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Bussmann ATM-15 retailer listing",
   "title": "Bussmann ATM 15 A: 0.430 in length x 0.150 in width x 0.642 in height",
   "url": "https://www.basupply.com/Cooper-Bussmann-ATM-15-Bussmann-ATM-15-Fast-Acting-Mini-Blade-Fuse-15-Amp-32-Volt-DC/p1942714",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Eaton / Bussmann",
   "title": "ATM fast-acting mini blade fuse data sheet (dimension labels not machine-readable; numbers .430 in, .15 in agree with the listing)",
   "url": "https://static.datasheets.com/doc/18968552-eaton-atm-4-ds.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "automotivefuses.com.au (Prolec catalogue)",
   "title": "Blade fuse catalogue: Micro2 with a 5.0 mm centerline spacing",
   "url": "https://automotivefuses.com.au/amfile/file/download/file/29/product/16731",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "SpecFits",
   "title": "ATC / ATO blade fuse: blade spacing 5.08 mm (0.2 in), SAE J1284",
   "url": "https://specfits.pages.dev/fuses/atc",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Littelfuse",
   "title": "MICRO2 series page: complies with SAE 2741-1 and ISO 8820-12:2020, 0.53 g",
   "url": "https://littelfuse.com/products/fuses/automotive-aftermarket-products/blade-fuses/micro2.aspx",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Automotive fuses (overview) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/fuses/automotive-fuses/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "ATO blade fuses (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/littelfuse-type-ato-fuses",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "ATM mini blade fuses (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/bussmann-type-atm-fuses",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Mini fuses (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/mini-fuses",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Maxi fuses (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/maxi-fuses",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "glass-cartridge-fuses-5x20-and-6-3x32",
  "faston-quick-connect-tabs",
  "ring-tongue-terminals-by-stud-and-wire",
  "terminal-blocks",
  "panel-cutouts",
  "wago-221-lever-connectors"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [
  {
   "feature": "regular ATO / ATC blade fuse",
   "exact": "body 19.1 wide × 5.1 thick × 18.5 tall; blade spacing 5.08",
   "mates": "fuse holder slot for the regular size (holder maker's drawing governs)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "mini ATM blade fuse",
   "exact": "body 10.9 wide × 3.6 (or 3.81) thick × 16.3 tall",
   "mates": "mini fuse holder slot (holder maker's drawing governs)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "maxi blade fuse",
   "exact": "body 29.2 wide × 8.5 thick × 34.3 tall",
   "mates": "maxi fuse holder slot (holder maker's drawing governs)",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "How big is a regular ATO / ATC blade fuse?",
   "a": "19.1 mm wide, 5.1 mm thick and 18.5 mm tall, with blades 5.08 mm (0.2 in) apart (SpecFits)."
  },
  {
   "q": "How big is a mini (ATM) blade fuse?",
   "a": "10.9 mm wide, 16.3 mm tall and 3.6 mm thick (Wikipedia, Wiltronics) or 3.81 mm (0.150 in, Bussmann listing); the page shows both."
  },
  {
   "q": "How big is a Micro2 fuse?",
   "a": "9.1 mm wide, 3.8 mm thick, 15.3 mm tall; blade spacing 5.0 mm."
  },
  {
   "q": "How big is a maxi blade fuse?",
   "a": "29.2 mm wide, 8.5 mm thick and 34.3 mm tall."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/automotive-blade-fuses-iso-8820-3/index.md"
}