Wireless output triggering for sirens, strobes, and physical plant automation

The Verkada alarm relays family provides programmable physical output switching to orchestrate external hardware actions during active alarm events. An enterprise intrusion system rarely operates in isolation; an alarm trigger often demands immediate physical responses—such as energizing building-mounted visual strobes, sounding industrial horns, releasing emergency egress gates, or signaling building management systems to lock down elevators. The BX21 Wireless Relay bridges digital alarm logic with external electromechanical systems.

Engineered for international deployments utilizing the Classic Alarms architecture, the BX21 establishes a wireless, supervised link back to the Verkada BH61 Wireless Hub or BK21 Keypad/Hub. The hardware features two independent Form C dry contact relay outputs (rated up to 30V DC at 2A or 120V AC), allowing installers to switch low-voltage signaling circuits or interface directly with external contactors. In addition to output switching, the unit incorporates two programmable dry contact input terminals, enabling external sensors or legacy panel trigger outputs to feed event signals back into the Verkada alarm environment.

Because external signaling devices are critical to facility defense, the BX21 operates with continuous bi-directional supervision. If wireless communication with the primary hub degrades, or if the unit's enclosure is opened, an alert is logged immediately in Command and dispatched to security managers. Operating on low-voltage DC power with battery backup capabilities, the compact module can be mounted directly adjacent to external sirens or gate operators without running homerun cabling back to the headend. HTS confirms regional frequency compatibility and auxiliary contact ratings before quoting.