Relay selection from RS please

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markymark2406

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I have a 12volt magnetic door lock which Is used at night time to secure a department in the building I'm working on unfortaintly there are door hold back in the door energised by 24volts, when the door is opened at night using a badge access system the person opens the door and then they are held back and the person can walk away leaving those doors open.

What I'm looking for is a relay with 12volt coil with a secondary side of N/C so when I pass 12volts through the coil it make the coil open and the door hold backs open circuit so they cannot be held back.

Looking for a RS relay which will do this please

HELP !
 
Last edited:
Is what your looking for just a 12v DPDT relay? Or did I misunderstand what your trying to do and a DPDT relay isn't suitable.
 
I'm a bit surprised that the door holdback is not turned off after working hours, to close the firedoors.

Presumably the fire alarm releases it.
 
Ok I will explain 12volt coming into a mag lock above the door I have to take that into a relay with 12volt coil then onto the door mag lock, in the daytime the maglock is not powered (controlled by a building management system) on the secondary side 24volt volts would flow through the relay on N/C to door hold backs, at night the building management turns the 12volt onto the mag lock then the 24volt would go N/C denenergising the hold backs.

Hope that helps just need a RS relay
 
From what your describing ANY 12v dc relay that can handle the power that is being used by the door holds will work.

Take power from the mag lock to the relay coil. When the mag lock isn't on the door hold circuit will be N/C and work as normal. When the mag lock is powered the door hold circuit will open and no longer hold the door. When the mag lock is de-energised to let someone in, the door hold will only be closed enough time that the mag lock is disabled anyway.

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Where the + & - go into the coil I will have my cable going from that point to the mag lock as when it is energised the mag locks will work and the secondary side of the relay will go N/o

The relay Bernardgreen kindly sujested says AC will that be a problem as it's DC on the 12volt side
 
AC powered relay will need AC in order to work, I'm failing to see why a standard 12v dv relay will not do what you want as I mentioned above. I apologies if I have not understood your request correctly, if so perhaps you can draw a diagram of what your trying to do?
 

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