not PLC but MCC related

I've used a circuit like you describe in the past and if I recall, the designer had specified a mercury-wetted contactor whose drop out time dictated the reverse time.

The fact that he used a mercury contact tells me there's some big-time arcing happening here and a mechanical one won't hold up.

Incidently, when implemented with the proper components, this is a cheap-and-dirty way to stop small motors quickly. However, with today's gadgets, there's certainly better ways to do it.
 

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