ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by gfretwell. 09/18/17 08:17 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 09/15/17 11:37 PM
Recreational Trailer Power Supply
by David1. 09/14/17 01:55 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,820 Are you busy
176,578 Re: Forum
168,506 Need opinion
Who's Online Now
0 registered members (), 38 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#21275 - 01/30/03 01:17 AM 18A. breaker = 30A Fuse???  
Joe Henry  Offline
Junior Member
Joined: Jan 2003
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.

Work Gear for Electricians and the Trades

#21276 - 01/30/03 08:25 AM Re: 18A. breaker = 30A Fuse???  
Redsy  Offline
Joined: Mar 2001
Posts: 2,056
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 11:03 PM Re: 18A. breaker = 30A Fuse???  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,862
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 - 01/31/03 12:20 AM Re: 18A. breaker = 30A Fuse???  
Joe Henry  Offline
Junior Member
Joined: Jan 2003
Posts: 2
Thanks for the responses guys, I appreciate it. Oh, its a 12Volt battery and it is a marine application, thanks.

Member Spotlight
Shinnston, WV USA
Posts: 1,044
Joined: January 2001
Show All Member Profiles 

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 14 (0.003s) Memory: 0.7589 MB (Peak: 0.8920 MB) Zlib enabled. Server Time: 2017-09-20 03:52:39 UTC