Matronics Email Lists :: View topic - Red start button and fuse.

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Red start button and fuse.

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

rparigor(at)SUFFOLK.LIB.N
Guest

Posted: Wed Dec 17, 2008 8:51 am Post subject: Red start button and fuse.

I have a red start button form Steinair (with one heavy bezel):

http://www.steinair.com/switches.htm



I like the switch. The tag on it says 120V AC 3A res.



I want to use it on a Rotax 914. I didn't find any info in the Rotax

documentation I have as to recommended rating of switch that should be

used.



Europa does recommend having a 5 amp fuse. Rotax shows a 2 amp fuse being

used. And Z-16 shows a 7 amp fuse being used.



I measured the resistance of the relay coil and it is 4.7 ohms. So if

there was a full 14 volts going to it it would draw a tad under 3 amps.



Often I see switches with a lesser rating for DC and inductive loads.



Practical questions:

Is the red button switch OK to use?

What circuit breaker rating should I use?



Thx. in advance.

Ron Parigoris

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Gilles.Thesee(at)ac-greno
Guest

Posted: Wed Dec 17, 2008 8:58 am Post subject: Red start button and fuse.

rparigor(at)SUFFOLK.LIB.NY.US a écrit :

 	  Quote: 	
		   I measured the resistance of the relay coil and it is 4.7 ohms. So if

 there was a full 14 volts going to it it would draw a tad under 3 amps.



 Often I see switches with a lesser rating for DC and inductive loads.



 Practical questions:

 Is the red button switch OK to use?

 What circuit breaker rating should I use?



   


	


Ron,



I've been using a 5 amp fuse for the starter relay on our Rotax 914 

project. Added a diode across the coil terminals.



Best regards,

-- 

Gilles

http://contrails.free.fr

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Dec 17, 2008 9:25 am Post subject: Red start button and fuse.

At 10:46 AM 12/17/2008, you wrote:

 	  Quote: 	
		  



I have a red start button form Steinair (with one heavy bezel):

http://www.steinair.com/switches.htm



I like the switch. The tag on it says 120V AC 3A res.



I want to use it on a Rotax 914. I didn't find any info in the Rotax

documentation I have as to recommended rating of switch that should be

used.



Europa does recommend having a 5 amp fuse. Rotax shows a 2 amp fuse being

used. And Z-16 shows a 7 amp fuse being used.


	


   Fuses or breakers in ANYBODY's diagrams should be

   evaluated against realities of the accessories

   being installed.

 	  Quote: 	
		  I measured the resistance of the relay coil and it is 4.7 ohms. So if

there was a full 14 volts going to it it would draw a tad under 3 amps.


	


   Don't know of any batteries that put out 14 volts to crank

   engines . . . but I suppose you could be jump starting

   from your car with the engine running. But good for you.

   Your deduction of current draw is the all importan first

   step.

 	  Quote: 	
		  Often I see switches with a lesser rating for DC and inductive loads.


	


   Once you add the diode across the coil, it is no longer

   inductive from the perspective of switch life issues.

 	  Quote: 	
		  Practical questions:

Is the red button switch OK to use?


	


    Yes.



 	  Quote: 	
		  What circuit breaker rating should I use?


	


    What ever you like that is equal to or greater than

    3 amps and commensurate with the size of wire used.

    22AWG and 5A is fine. 20AWG and 5A is fine too.



        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

stein(at)steinair.com
Guest

Posted: Wed Dec 17, 2008 10:16 am Post subject: Red start button and fuse.

Bob is of course right...and it sounds eerily similar to what I said on the

phone 30 minutes earlier!



Cheers,

Stein



Do Not Archive



[quote]--

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

marcausman

Joined: 08 Feb 2007
Posts: 70

Posted: Thu Dec 18, 2008 8:20 am Post subject: Re: Red start button and fuse.

OK, who is pushing Stein's buttons?     ha ha   Sorry, couldn't resist.



Merry Christmas and best wishes.



 	  stein(at)steinair.com wrote: 	
		  Bob is of course right...and it sounds eerily similar to what I said on the phone 30 minutes earlier!



Cheers,

Stein



Do Not Archive

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum