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#21275 - 01/29/03 09:17 PM 18A. breaker = 30A Fuse???
Joe Henry Offline
Junior Member
Registered: 01/29/03
Posts: 2
Can someone please explain this to me? I have a device (electric fishing downrigger) in which the manufacturer has stated the following..."a 30A fuse or an 18A circuit breaker must be installed as close to the battery as possible" Ok, I do not understand this. There are 12AMPS of difference here, so how can they both protect equally? Thanks, Joe.
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#21276 - 01/30/03 04:25 AM Re: 18A. breaker = 30A Fuse???
Redsy Offline
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
The (non time delay) fuse is oversized to permit inrush (starting) current to flow without blowing it. A thermal circuit breaker has an inherent ability to overcome inrush.
It must be a special CB if it is available at 18 amps.
#21277 - 01/30/03 07:03 PM Re: 18A. breaker = 30A Fuse???
HotLine1 Offline

Registered: 04/03/02
Posts: 6778
Loc: Brick, NJ USA
"As close to the BATTERY..."
Gee, is this a "marine" application??
Are ya running it off 12 volt?? 24 volt??
or 120 fropm a genset??
By your wording, it sounds like 12/24 volt DC.
#21278 - 01/30/03 08:20 PM Re: 18A. breaker = 30A Fuse???
Joe Henry Offline
Junior Member
Registered: 01/29/03
Posts: 2
Thanks for the responses guys, I appreciate it. Oh, its a 12Volt battery and it is a marine application, thanks.

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