Access control devices typically receive power from a dedicated power supply or charger that converts incoming AC power to regulated 12 VDC or 24 VDC for locks, readers, and accessories. Power distribution modules and controllers then route that power through individually protected outputs, using reader, keypad, push-button, or fire alarm inputs to control lock operation and support fail-safe or fail-secure configurations.

When choosing access control devices, select fail-safe operation when the lock should release during power loss or an emergency, and fail-secure operation when the lock should remain locked without power, subject to applicable life-safety requirements. Check the lock type, available 12 or 24 VDC power, trigger method, battery backup, and fire alarm disconnect options, since many access power controllers support individually selected fail-safe or fail-secure outputs.

Access control devices can connect to a fire alarm control panel through a power controller’s fire alarm interface, allowing the panel to trigger emergency egress, alarm monitoring, or auxiliary devices. Installers can select fire alarm disconnect behavior for individual lock outputs, supporting fail-safe or fail-secure operation based on the site’s access and life-safety requirements.

Multi-output access control devices support multiple doors with independently controlled, fused or PTC-protected outputs that can operate in fail-safe or fail-secure modes and route power to locks, strikes, and door holders. Selectable dry contacts, separate power-source options, fire alarm disconnects, and configurations with four, five, or eight outputs can help integrators accommodate varied door requirements and plan for future expansion.