my psu breaker keeps tripping when i power up . it's a 6 amp, C rated. i think it's either the relay or the push switch i'm using .when i bypass both of them and use the switch on the door to power up everything's fine . i'll have another go at it tomorrow. perhaps a safety relay might be getting a call from the bench sooner than planned. on reflection after some reading i'm sure i will be using an input on my BOB for an E/stop. Mach 3 tutorials reveal alot!!!!