[Moon-net] Blower relay

[Oene Spanjer]

Hello All,

Maybe a bit off topic, but think surely one can help me with this.
I have a blower which runs at 150V AC for cooling the GS35b 
but want to let it run at normal 230V AC during transmit periods.
I already tried a conventional relay to switch the motor's both 
wires between the two voltages, but that leads to lots of sparks and
black contacts in the relay.
So I am in need of a circuit schematics of a solid state relais that
can switch between each voltage.

Thanks in advance 

73 Oene