Whats in a release - Electric Strike releases
Today I would like to write about strike releases, and just give customers a little more insight to what they do and the types that are available.
The basic function of a strike release is to allow a lock (mostly latching types) to slip their locking function by applying electricity to the release. This in turn operates a solenoid or and electromagnetic coil to open its jaw and allow the door to open.
The reason a latch (shape) is used is so when the door gets closed after the operation the latch will lift over the strike and spring back into the keep ready for the next operation. There are exceptions to using a latch type lock but we will try to keep it simple for the ease of the explanation.
There are normally two types of strike mortice and rim (see mortice and rim locks blog) ones that go into the frame and ones that sit on the frame.
Have a look at the example of locks and strikes that suite mortice applications
Have a look at the example rim type locks and their type of Rim electric strikes
Once you have decided what best suites your application Mortice or Rim you can then go on to consider what voltage you need, mostly strikes come in two voltages 12 Volt and 24 Volt and then AC or/and DC
12 Volt AC works with a multitude of intercom systems throughout the UK, one of the easy tests you can do to see if the strike is AC is simply press the release button and if the strike buzzes then pound for pound its AC. if it just clicks then its probably DC.
24 Volt is not that common for security applications but is more common for Fire Alarm Systems the reason behind this, is that Fire Alarm System work of 24V DC.
Once you have decided what voltage and type that you need finally you need to consider the option Fail Safe or Fail Secure.
Fail Secure or Fail Locked means that when no voltage is present the strike will not open to allow the door to open - this is typical of an AC strike, simply because if you had to have voltage present all the time, the constant buzzing will drive you crazy.
Fail Safe or Fail Unlocked means that voltage is present there all the time to keep the strike in the locked position. If there is a power failure the strike would open and therefore, the door will open or can be pushed open.
The latter is normally used in systems where in the event of an emergency the door will release or fail safe. This is typical with electric strikes connected to fire alarm systems to release emergency doors in the event of an alarm activation.
I very much hope this give you a basic understanding on electric strike releases, I know there are again variations on the theme like monitoring etc.
Feel free to give some feed back on what you have used a strike for or the best type. In the meantime many thanks for reading my blog. feel free to ask our sales team if you need more info or perhaps what you have read is enough info for you to make your choice.
Many thanks for reading
Head of the Tech Team @ LocksOnline
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