Electrical Wiring in the Home/switched receptacles

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QUESTION: We are working with 220-240 volt 20 amp receptacles.
There is a small switched version of a 120-240 volt 20 amp duplex receptacle where the top half is a switch and the bottom half is a receptacle but I believe the switch is only to control a light and does NOT control the lower receptacle itself ??
First .... could this 120-240 volt switch/receptacle combo be re-wired to make the switch control the power to the receptacle and if yes, would it only work on 120 because I assume the switch would be single pole ?  ... or could it be wired to control 240 volts through the switch to the receptacle
Second ... If you can't run 220-240 thought the switch, is there a different heavy duty version ( but the same physical size ) available that will let you run the receptacle half through the switch half. ? .... a Nema 6-20R on the bottom with a controlling switch on the top half.
I'm trying to keep this switch plug combo contained in a standard knock-out box rather than having to go to a large wall mounted switch.
Thanks

ANSWER: No, because the switch is single pole, you can not use it for 240 volts.

---------- FOLLOW-UP ----------

QUESTION: o.k.  so a standard 120-240 volt single pole switch won't work but "if" I can find 2 pole switch in combination with a receptacle will that work ?
.... and do you know of such a combination ?
I currently have a system that seem to work but I don't understand why.
I have one leg of a 240 line going through a separate detached switch ( I think it's a single pole ) and that leg is connected to one side of a 120-240 receptacle. The 2nd leg of the 240 volts by-passes the switch and goes directly to the other side of the receptacle.
When the switch is in the off position, I have 56 volts at the receptacle which is not enough to even turn the small 240 motor that I have plugged into the receptacle.
When I turn the switch to the on position I have 240 volts at the receptacle and the motor runs fine.
Not sure why this is.
However I am trying to change this to a single duplex receptacle with the top half being the switch and the lower half being the receptacle.
Can you explain this phenomena and how to set it up the way I want

Answer
No, I don't know of a switch in combination that is double pole.  By code, anything that is 240 volts has to have both sides turned off.  For example, a 240 baseboard heater must use a double pole thermostat.  This is because someone can get shocked thinking something is off, when it still has current in it.
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Bob Sponaugle

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Just about any home wiring question. (not appliance repair) I have done all kinds of home wiring for myself, including adding a new breaker box, etc. Please, questions from North America only. Please be specific with details.

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