When a lock is Fail-Safe it means that when power is dropped
it will be unlocked. During normal operation it requires power applied at
all times and a Normally Closed (NC) and Common (C) connection to a relay.
An example of this is mag lock.
When a lock is Fail-Secure it means that when power is
dropped it will be locked. During normal operation it will not have power
applied and is unlocked with a momentary closure. This can be
accomplished with a Normally Open (NO) and Common (C) connection to a relay. A
strike is an example of a lock that can be Fail-Secure, or can be ordered as
Fail-Safe.
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