Question about RTO Telemecanique Gv2 Ls22 Magnetic Circuit Breaker

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What is the use of wye delta? - RTO Telemecanique Gv2 Ls22 Magnetic Circuit Breaker

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I don't know why your question is bound to this special breaker.

If your question is common, the wye/delta is a way to reduce the starting current of a large three phase asinchronous motor.
When a three phase motor is first connected in wye (star), the starting (peak) current is about 3 times less than this in delta. When already in motion the electromotive force will make the peak current when turned in delta much less, than that with a stopped motor.

Posted on Aug 08, 2010

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when your dealing with a high leg as long as your using two phase wires it is balanced. any two legs will give you 240 volts a.c.

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Its going to depend on whether you are connecting to 240 volt or 440 volts...

It also depends on whether it is a 'wye' wound motor or a 'delta' wound motor.

A nine wire motor is probably a multi-voltage motor capable of running on either 240 or 440 volts. For operation on low voltage, 240 v, the windings must be connected in parallel whereas hi voltage operation makes it necessary to have the windings wired in series.

I will not give the details on the winding connections because the process to determine whether it is a 'delta' or 'wye' wound motor is too involved to derscribe on a forum. But..... if it is a 'wye' wound motor, there will be three additional wire connections 10, 11, and 12, that are wired together and under the end bell and not accessible.

We don't want to 'smoke' your motor, so let the suggestion be to contact a reputable and qualified electrician who you trust to determine what's required and to connect it without the potential for damage.

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Since each of these three phase systems also offers 120volt for lights, and a dimmer can be used for lights, then I wonder what you are using dimmer for?

208 volts.can be controlled by turning off one hot of the two hot wires.
Install dimmer on one of the hot wires, and see what happens.
Is the dimmer rated for 208 volts?

Add a comment and say what you discover.

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