For your 240 volt, you'll want a double pole normally open relay. The coil voltage you want could be 24. The relay contacts must be capable of carrying the load of the pump motor. There will be six connections on this type of relay. Two Line- where your 240 volt power go, Two Load- where the two wires go from your pump, and Two control wires- which when fed with 24 volts will pull in your relay. You'll need a 24 volt transformer which could be fed from your 240 volt power supply (look for a multi input voltage type) To wire the control circuit: run one wire from the 24 volt side of the transformer to one of the coil terminals on the relay. Run a two wire cable from the second 24 volt terminal of the transformer to your kitchen switch and back to the second coil terminal on the relay. The 240 volt stuff must be enclosed in an electrical box of some sort and you can't mix line voltage and low voltage wire in the same box unless there is a divider. You can however run low voltage through a line voltage cable and not have this situation
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18 years ago