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nagaengg
Member

Join Date: Mar 2010
Posts: 5

Auxiallary voltage for relays

03/12/2010 11:21 PM

Y we prefer D.C rather than A.C as Auxiallary voltage for relays
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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#1

Re: Auxiallary voltage for relays

03/12/2010 11:45 PM

I think the subject should be 'Voltage for auxiliary relays' (not 'Auxiallary voltage for relays').

There are primarily two reasons:

(1) DC supply can be available from batteries, so when AC power is lost DC power is still available. For AC relay UPS is required in this case.

(2) DC auxiliary relay is faster than AC auxiliary relay

- MS

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Anonymous Poster
#2
In reply to #1

Re: Auxiallary voltage for relays

03/13/2010 5:44 AM

with the DC supply consatant torqu is possible. so that we use DC supply
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