I have a 120V DC winch and wanting to set it up it in a control circuit that is powered through relay contacts. My trouble or inability is that I am unable to determine if breaking the circuit is possible without having a 120V DC contacts. Where if AC contact would easily break an AC current sine wave because it runs through 0 volts, would this DC circuit be able to be broken before the bridge rectifier as AC because it is using no capacitors for leveling the power That is: because the Voltage rises and falls at the same rate as AC?

 

I have a 120V DC winch and wanting to set it up it in a control circuit that is powered through relay contacts. My trouble or inability is that I am unable to determine if breaking the circuit is possible without having a 120V DC contacts.

I am not sure what exactly you are asking? OK you have a winch and the motor uses 120 VDC. My guess here is yes, you can open the AC line side using either a switch or relay. Either would need to handle the AC Line current. I have no clue wwhat your winch driver circuit looks like or your winch current draw?

Ron

 

Possible to also implement zero crossing switch with triac control

 

120V Direct Current through a set of contacts rated for 120V Alternating Current is not recommended. If the wench is drawing sufficient current then the contacts could arc and the motor keep running. A standard relay is not the correct device. You CAN get a relay with a blow-out magnet that will extinguish the arc should one occur.

Here's an article on it:
https://www.durakool.com/informatio...s/blowout-magnets-what-they-are-why-use-them/

 

"I have a winch that I am attempting to place in a holding circuit."
What does this mean? "Holding circuit?"

 

Indeed the TS has not provided details, NOR THE REASON for wanting "a holding circuit", or even what that "holding circuit" would do.
Winches often have BRAKES, and some of them also have dynamic braking options.
One big question is about the actual power source. Is the winch powered by batteries?? AC is also mentioned .
Some common, mains powered, smaller, winches use mains power and a rectifier system to drive the motor in both directions. We are not given any hint about the particular winch.
It seems that the TS should provide quite a bit more information about the desired control scheme.

 

He didn't stick around long, - 5 MIN !

 

Someone wake me if he comes back.

 

The phrasing of the request was a bit confusing, for sure. But none of the responses were at all unfriendly. Possibly the TS simply was not ready for a bunch of replies. TheTS might come back in a while.

 

According to the time line of each response, the OP never saw any!?.