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. More.

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