just be able to control the ON/OFF of two wires, 0 V, 0 A.

 

What do you mean by OV, OA? That you want to turn off the connection completely?

Your 0Ω requirement, that is for the closed switch?

If that is what you mean, you might want to look at low loss reed relays like the ones used in high end multimeters.

 

What do you mean by OV, OA? That you want to turn off the connection completely?

Your 0Ω requirement, that is for the closed switch?

If that is what you mean, you might want to look at low loss reed relays like the ones used in high end multimeters.

Thank you. I mean just contact two wires, no power on the wires.

 

Thank you. I mean just contact two wires, no power on the wires.

How does it help to connect wires if there will be no current flow?

 

How is the contact to be made, manually? Automatically by some actuator?

If there's zero current, then the ohms don't matter and philosophically speaking, the wires are already connected.

 

Tell us exactly what type of signal you want to switch, instead of a solution that makes no sense.

 

just be able to control the ON/OFF of two wires, 0 V, 0 A.

A SPST switch, perhaps?

If you want to go fancy, you can go DPDT to disconnect two wires at once

 

Sorry my unclean description.

The control side still use whatever V need. The contact side now have a little contact resistance about 0.8 Ohm . it's no good for my use.

 

Sorry my unclean description.

The control side still use whatever V need. The contact side now have a little contact resistance about 0.8 Ohm . it's no good for my use.

And it is still unclear. Draw a schematic.

 

This should do it...

 

This should do it...

Ha, good idea.

 

Most mechanical switches will have an on-resistance of only a few milliohms.

 

Most mechanical switches will have an on-resistance of only a few milliohms.

There can be a problem with contact tarnish and/or oxidation in very low current applications. This gets very evident with dodgy electronic ignitions for the old kettering points if they don't put enough "wetting" current through.

A lot of modern power MOSFETs have RDSon somewhere in the milli Ohm range, and that characteristic is more stable.