Re: Contactor question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Richard W. by way of Terry Fritz <teslalist-at-qwest-dot-net>" <potluck-at-xmission-dot-com>

The contactor will be the master switch for the system. The deadman switch
is in series with the coil. There is also an over-current circuit that will
shutdown the system in case of extreme currents. Before this system is put
into actual use I want to make sure the contacts can survive opening with a
minimum amount of burn. I've found variac brushes to be expensive and
contacts for a contactor are expensive to replace as well. Aside from that a
welded contact would mean a very unsafe condition allowing power to flow in
a situation where shutdown should have occured.

Rick W.

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, June 25, 2003 5:12 PM
Subject: Re: Contactor question


 > Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<tesla-at-lists.symmetric-dot-net>
 >
 > The contract opens as in shuts off? Maybe your the coil is dropping out
 > because it's not getting whatever it needs to hold the contacts closed. Is
 > it an AC or DC coil?
 >
 > KEN
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, June 25, 2003 11:46 AM
 > Subject: Contactor question
 >
 >
 >  > Original poster: "Richard W. by way of Terry Fritz
<teslalist-at-qwest-dot-net>"
 > <potluck-at-xmission-dot-com>
 >  >
 >  > Hey List,
 >  >
 >  > Scenerio:
 >  > Variac stack feeding a 10Kva pig 240vac at 35 amps.
 >  > 2 poles on the contactor are being used (red and black wires)
 >  >
 >  > Contactor
 >  > Arrow Hart Size 3
 >  > 240v 25hp 1 phase
 >  > 120 FLA
 >  > 720 LRA
 >  >
 >  > Under the above conditions the contactor opens....
 >  > Do I need some kind of arc protection and if so how?
 >  >
 >  > Thanks
 >  >
 >  >
 >  >
 >
 >
 >