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Question:

Interlocking principle between relays? who knows

Interlocking principle between relays? who knows

Answer:

The simplest is that the relay 1 in front of the relay before the closure of the relay 2 in turn the same relay 2 before the relay plus the beginning of the relay 1
The above answer is too much trouble, simply put the two relay normally closed contact in series with each other in the coil circuit, to ensure that only one relay at the same time work.

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