inverter overload (was transformer inrush) [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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Allan,

As long as you use all four terminals on the pressure switch, the 
contacts are all in series -- whether it switches both sides of the 
power (2 hots), or one side, with a series-link between both the sets 
of contacts. (The latter is done to avoid breaking a grounded 
conductor). Whether they are on opposing sides or adjacent to each 
other in a circuit makes no difference.

So, all contacts in series is already the assumption on which the 
contact ratings are based. You can't compensate for undersized 
contacts by series or parallel connection.

Windy


Allan Sindelar wrote:
>
>I'm pulling out one piece from Windy's reply to make a noncorrective
>inquiry.
>>
>>  It won't help much to parallel the two sides of the p. switch because
>>  the 2 sets of contacts don't make or break exactly simultaneously.
>>  One set of contacts will take the full current during the make or
>>  break. The only way to prevent contacts from welding or burning is to
>>  use a "heavy duty" p. switch (or a relay) rated for 2X the current of
>>  the pump.
>>
>>  Windy
>
>Windy, I think it was you who advised wiring the two sets of pressure switch
>contacts in series with DC to reduce arcing. It seems to me that this would
>be just as effective with 120V AC as with DC, even granted that AC is far
>less prone to arcing.
>
>Allan

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