Re: Contactor questions

In a message dated 95-10-18 23:25:48 EDT, tesla-at-grendel.objinc-dot-com writes:

>Steven Roys SR>
>>>Since each 
>>>contactor has two relays and each relay has three contacts, does 
>>>this mean that I could wire everything up in parallel and be good to 
>>>go for up to 3 * 2 * 27A, or is the 27A rating for each relay rather than 
>>> each contact?
>>     Yes.
>SR>This was a multiple-choice question, but I am assuming that you meant 
>SR>"Yes, you can run 162A through this puppy by paralleling all the 
>SR>contacts".  If I'm wrong, please let me know before I burn my house 
>> parallel all the contacts on the hot.  Of course, use separate contacts 
>> for 220V connection.
>	I have no direct experience with this, but one possibility concerns 
>me. I don't think it would cause you to burn down your house, but it may not

>be safe. If you parallel the relay contacts  and they do not contact at 
>the same time, then one contact may have to carry all the current for a 
>short time. This circumstance coupled with lots of current flowing may cause

>the contacts to weld together...
>-Ed Harris


This should be ok as you will probably be using a variac to power the system.
 When you energize the contactors, the variac shold be off and very little
current will flow.  You won't have many amps flowing until you get the variac
up to full power.

Ed Sonderman