Engine 2014: Electricity

1. A Electrical interlocking by means of normally open "1S" and "R" auxiliary contacts.
2. B Electrical interlocking by means of normally closed "1S" and "R" auxiliary contacts.
3. C Electrical interlocking by means of the normally closed, timed open and the normally open, timed closed "2S" contacts.
4. D Mechanical interlocking is the only means by which simultaneous pulling in of the "1S and "R" contactors is prevented.

Tip: press A-D to answer