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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Dec 02, 2013 6:51 am Post subject: Contactors

 	  Quote: 	
		  

 Yes the Faston tabs are 3/8" instead of the regular 1/4". Here's a pic I took yesterday but its not easy to see how the connections are made on the cube. 

 Sacha



 



 Note that he appears to be using something (on the left) that looks to me like a battery contactor in lieu of a starter contactor. The master contactor is the red "384" series cube on the right. 	


    I am not comfortable with the notion of tying

    4AWG wires to these 70A plastic cube relays . . .



    Consider the terminals on a 70-series contactors

    . . . or any other "contactor". They are mechanically

    robust. 

 

 [img]cid:.0[/img]



   The whole idea behind terminal posts on a contactor

   is to provide rigidity . . . wiring induced bending

   and torque moments do not move the terminal . . .

   hence they do not affect contact alignment inside

   the contactor.



   Terminals on the plastic cube relays are simply

   held in place by virtue of the housing molded

   around them. I think if I were going to incorporate

   one of the 70A cubes into a system, I would wire

   with no greater than 6AWG and use welding cable

   at that (soft and flexible).



   The reasoning driving substitution of the plastic

   cube as a battery relay seems to be rooted in 

   power consumption . . .



   The 'savings' between a cube (180mA) and a

   70-series (700mA) coil current is only about

   1/2 amps.



   Are you sure you NEED to save that 1/2A for

   other tasks?  If 1/2A has so much influence

   on your load analysis, then perhaps you're

   proposed sources/loads are not practical.



   I suggest you consider finishing up the load

   analysis task before you commit to incorporation

   of an extra-ordinary substitution for a battery

   contactor with a known service history.



 

   Bob . . .

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uuccio(at)gmail.com
Guest

Posted: Tue Dec 03, 2013 9:12 am Post subject: Contactors

Thanks for your comments Bob. In effect I had not considered the mechanical suitability. I generally tend to like to do things with the simplest most commonly available automotive type parts but maybe this is one case where it's simply not a good idea. 

Sacha



On Dec 2, 2013, at 15:49, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

[quote]   	  Quote: 	
		  

 Yes the Faston tabs are 3/8" instead of the regular 1/4". Here's a pic I took yesterday but its not easy to see how the connections are made on the cube. 

 Sacha



 



 Note that he appears to be using something (on the left) that looks to me like a battery contactor in lieu of a starter contactor. The master contactor is the red "384" series cube on the right. 	


    I am not comfortable with the notion of tying

    4AWG wires to these 70A plastic cube relays . . .



    Consider the terminals on a 70-series contactors

    . . . or any other "contactor". They are mechanically

    robust. 

 

 <18a022d3.jpg>



   The whole idea behind terminal posts on a contactor

   is to provide rigidity . . . wiring induced bending

   and torque moments do not move the terminal . . .

   hence they do not affect contact alignment inside

   the contactor.



   Terminals on the plastic cube relays are simply

   held in place by virtue of the housing molded

   around them. I think if I were going to incorporate

   one of the 70A cubes into a system, I would wire

   with no greater than 6AWG and use welding cable

   at that (soft and flexible).



   The reasoning driving substitution of the plastic

   cube as a battery relay seems to be rooted in 

   power consumption . . .



   The 'savings' between a cube (180mA) and a

   70-series (700mA) coil current is only about

   1/2 amps.



   Are you sure you NEED to save that 1/2A for

   other tasks?  If 1/2A has so much influence

   on your load analysis, then perhaps you're

   proposed sources/loads are not practical.



   I suggest you consider finishing up the load

   analysis task before you commit to incorporation

   of an extra-ordinary substitution for a battery

   contactor with a known service history.



 

   Bob . . .  

[b]

- 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:

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