Jump to content
Email-only Log-Ins Coming in December ×

IGNORED

What size of fuse


grannyknot

Recommended Posts

Electronic Fan Controller 70 Amp

This is the electric fan controller I just picked up, it has a 70amp relay and they are recommending a 70amp fuse for the main power wire, now from what I understand the 70 amp relay is to handle the momentary power surge it take to get the fan going and up to speed but a 70amp fuse doesn't sound like it is going to protect much. Aren't wires going to melt before a 70amp fuse blows?

Thanks,

Chris

Link to comment
Share on other sites


Well, if it's 4 AWG or larger it won't. ;)

This is where it is important to know the fuse curve. Instead of trying to explain it imperfectly, I'll post this link: http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/solution-center/technical_library/BUS_Ele_Tech_Lib_Time_Current_Curves_How_to_Read.pdf

Basically, you might need 70A for inrush, but that is only for a short duration. I think a 20A fuse would work, but you would need 12AWG or larger wire for the circuit.

Link to comment
Share on other sites

Hi Chris,

The controller in your link has a built in 70Amp relay, but that doesnt mean your fan will pull that much. RelaYs have an over capacity to help prevent the contacts burning.

You need a fuse to suit the fan your using. Do you have and specs for the fan your planning to use?

Chas

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Who's Online   0 Members, 0 Anonymous, 533 Guests (See full list)

    • There are no registered users currently online
×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.