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⚡ Protect your power like a pro — fuse smarter, not harder!
The WirthCo 31820 Battery Doctor In-Line Fuse Holder is a professional-grade, water-resistant ATO/ATC blade fuse holder featuring a 30 amp max current capacity and heavy-duty 12 AWG wire. Designed for easy installation with a 5.5-inch loop and through-hole mount, it includes a protective cover to safeguard your fuse from moisture. Trusted by professionals for over 30 years, this compact and durable fuse holder ensures reliable electrical protection for automotive and power applications.






























| AC Adapter Current | 30 A |
| ASIN | B00DQ5JRUA |
| Best Sellers Rank | #1,831,356 in Automotive ( See Top 100 in Automotive ) #878 in Automotive Replacement Fuse Holders |
| Brand | WirthCo |
| Brand Name | WirthCo |
| Customer Reviews | 4.5 out of 5 stars 259 Reviews |
| Global Trade Identification Number | 00010054318204 |
| Included Components | 1 Manufacturers Branded Product |
| Item Dimensions | 4.5 x 1.8 x 1.3 inches |
| Item Weight | 1.12 ounces |
| Item dimensions L x W x H | 4.5 x 1.8 x 1.3 inches |
| Manufacturer | Battery Doctor |
| Material | Plastic or Rubber |
| Material Type | Plastic or Rubber |
| Maximum Current | 30 A |
| Model | 47935 |
| Mounting Type | Through-Hole Mount |
| Part Number | 31820 |
| UPC | 010054318204 |
| Unit Count | 1 Count |
J**B
Great quality inline fuse at a good price.
This is an excellent inline fused wire. Although the description says that the 30A fuse is not included, mine did come with one (and it was new in packaging). I used this to install a battery into a Peg Perego (kids John Deere tractor) and it works great.
A**R
easy to use, quality seems good
fast install for charging connector for towed vehicle
G**T
Very nice.
Very good. Came with a 30A fuse already in the holder. Works great!
T**M
Good quality and fuse included
Only needed one but got two for one price. Good quality and fuse included!
S**H
Great!
Works great; includes 30a blade fuse. Used it for a replacement battery on my kids' Powerwheels vehicle.
M**.
Good product at good value
Came as described. Great product for the value. It's easy to just cut to required length (comes in a loop, just cut where you want). Even came with a fuse installed, made it very easy for me!
J**H
Decent fuse holders.
These are okay, but I decided to go with ATM fuse holders due to size.
T**1
Comes with a fuse. not a mini or mega ...
Comes with a fuse. not a mini or mega, just normal fuse. I bought this when I was adding a second battery to my sons pw 4wheeler to prevent wiring damage. The wire heats up with heavy use and the 30watt fuse pops before any damage done
M**E
Bonne qualité
Bonne qualité Sera très utile
S**S
Used this to add a fuse to my tractor. ...
Used this to add a fuse to my tractor. Just what I needed. Wire is about 12 gauge,. and stiff.
Trustpilot
1 day ago
4 days ago