Self holding contactor circuit for 3-phase motor control
![](http://neu.davidmuench.de/wp-content/uploads/2014/10/schuetz_selbsthaltung-294x300.png)
Due to limited space in the workshop, the suction device (Bernardo DC-400 400V) for the planer and table saw is placed one level above the workshop. The suction device is originally equipped with a zero-voltage switch (Kedu KOA7). The suction device should be modified, such that it can be turned on and off directly from…