Hi Every Body.. I am working on a 3-phase motor driven pump starter. A 480vac, 7.5kW, 60Hz motor is to be start when low pressure signal energized and stop when high energized. I am thinking of using a DPST latching relay in my control circuit. The problem that I should use a transformer and rectifier to safe my control circuit. I am confused with wiring these things. Could any one help in that... Thanking you..