Several normally closed electric shocks are connected in parallel and then connected in series with the coil

The contactor coil is de-energized only when several conditions are met . This can be achieved by connecting
several normally closed contacts in parallel and then in series with the coil
, as shown in Figure 1-3. To de-energize the contactor KM coil , the coils
of the intermediate relays KAi and KAz must be energized, and the normally closed contacts KA] and KA2 must be disconnected (meaning the stop button is not pressed).