I think they may be internal window shutters? very basic on the control side of things?

Also if the mcb failed you would not be getting in the building?

For the failing coil, just use a normally closed contact?

Then if the supply to the coil failed the show would kind of "auto open" itself at 3am

Lol that would really mess with the drunks minds!!
 

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Title
HELP with electric roller shutters in a shop
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Electrician Talk | All Countries
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Damo666,
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Steve1412,
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