Contactor

[24kenneth]

The project I am on they put a contactor in between the main switch for a 480-volt Transformer so they could control 120 208 panel under a load

 

[Dennis Alwon]

Welcome to the forum. What exactly are you wanting to know?

 

[hillbilly1]

The project I am on they put a contactor in between the main switch for a 480-volt Transformer so they could control 120 208 panel under a load

Done all the time. At least 90% of Home Depot’s does this to control display panels. It is cheaper to control the primary of the transformer because the contactor is roughly 50% smaller.

 

[texie]

Done all the time. At least 90% of Home Depot’s does this to control display panels. It is cheaper to control the primary of the transformer because the contactor is roughly 50% smaller.

Yep, pretty common. You also save on the xformer losses while it's off. Just gotta be sure the contactor is rated for the inductive inrush.

 

[Jraef]

Yep, pretty common. You also save on the xformer losses while it's off. Just gotta be sure the contactor is rated for the inductive inrush.

And that someone is willing to live with the contactor hum (added to the transformer hum) when it is energized.
If not, using a latching contactor is the way around that.

 

[augie47]

And that someone is willing to live with the contactor hum (added to the transformer hum) when it is energized.
If not, using a latching contactor is the way around that.

Maybe with newer "Smart" contactors you can select a tune rather than a hum True ??:

 

[Jraef]

Maybe with newer "Smart" contactors you can select a tune rather than a hum True ??:

If not, I'd be willing to bet someone is now working on making that upon your suggestion...

One of our engineers made a demo unit that uses the sounds made by the stepper motors to play the "Darth Vader" theme from Star Wars. He got the idea from this video.

Our boss was not amused because he understood how much time that would have taken. But the rest of us were impressed.