Modernization Power

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#36901 - 02/19/24 10:23 PM Modernization Power
Joined: Aug 2016 Posts: 755 Jluff old hand
Jluff old hand Joined: Aug 2016 Posts: 755	If you have a 100amp service to your disconnect and the new controller manufacturer is recommending 45 amp. What size should the disconnect fuses be ?

#36902 - 02/19/24 11:20 PM Re: Modernization Power [Re: Jluff]
Joined: Oct 2013 Posts: 175 NOTIME member
NOTIME member Joined: Oct 2013 Posts: 175	https://m.littelfuse.com/~/media/electrical/application-notes/littelfuse-motor-protection-guide.pdf https://www.elliottelectric.com/Sta...otor-protection-using-horsepower-hp.aspx https://www.elliottelectric.com/Sta...ection-using-full-load-amps-current.aspx Last edited by NOTIME; 02/19/24 11:20 PM.

#36905 - 02/20/24 03:17 PM Re: Modernization Power [Re: Jluff]
Joined: Aug 2016 Posts: 755 Jluff old hand
Jluff old hand Joined: Aug 2016 Posts: 755	Thank you.

#36906 - 02/20/24 04:48 PM Re: Modernization Power [Re: Jluff]
Joined: Apr 2020 Posts: 397 Montana enthusiast
Montana enthusiast Joined: Apr 2020 Posts: 397	Usually the controller manufacturer will list the mainline disconnect size on the print. In your case they are probably calling out a 45 amp disconnect so 45 amp fuses. They should of calculated this load off of your survey of the equipment being modded. What equipment and controller are you going with?

#36907 - 02/20/24 05:47 PM Re: Modernization Power [Re: Jluff]
Joined: Aug 2016 Posts: 755 Jluff old hand
Jluff old hand Joined: Aug 2016 Posts: 755	Alpha Controller Canton Power Unit. 480v 25 HP motor. I think FLA was 33.9 75fpm Last edited by Jluff; 02/20/24 05:49 PM.

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