As shown in the illustration, in addition to mechanical interlocking of the contactors, how is simultaneous pulling in of both the "1S" and 'R" contactors prevented? See illustration EL-0012.

Question

Accepted Answer

Electrical interlocking by means of normally closed "1S" and "R" auxiliary contacts.

Answer

Electrical interlocking by means of normally open "1S" and "R" auxiliary contacts.

Answer

Electrical interlocking by means of the normally closed, timed open and the normally open, timed closed "2S" contacts.

Answer

Mechanical interlocking is the only means by which simultaneous pulling in of the "1S and "R" contactors is prevented.

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