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If you do need a disconnect, then it would be possible to use a general-use snap switch suitable for use on AC current only, where the full load current of ther motor does not exceed 80% of the ampere ratiing of the switch. In my opinion, a 2 pole 20 amp switch will be fine for this application.
Also, I feel that your circuit breaker size is too big. Unless the nameplate on your pump calls for a 20 amp breker, a 1/2 horsepower motor at 230 volts should be on a 15 amp breaker.
[This message has been edited by Tom O (edited September 17, 2003).]