What is the difference between fail-safe & fail-secure EM lock?
EM lock uses power to keep the door secured. When power is cut-off (eg. during a power trip), the door access system’s backup battery will keep the door system running for 2 to 4 hours. When the battery is flat and the electrical main power is not back to normal yet, a fail-safe EM will basically unlock. Anyone inside the office will be able to leave the office. For a fail-secure EM lock, once the battery is flat and the electrical main power is not back to normal yet, the fail-secure EM lock will stay locked. People inside the office must have access to another exit door. For safety reason, fail-safe EM locks are more commonly used and less expensive than fail-secure locks.
