Siemens CQDA1BA Auxiliary Alarm Switch Breaker Accessory

The Siemens CQDA1BA Auxiliary Alarm Switch Breaker Accessory is a one-pole alarm/auxiliary switch designed to install in the accessory space of Siemens CQD and related breakers to provide signaling of breaker status. Catalog number CQDA1BA supports CQD, BQD and related frame breakers and adds a dedicated 1-pole space for an accessory, enabling an alarm/auxiliary contact to be wired to monitoring or control circuits. The accessory is rated for up to 600/347 VAC and has a 15 A contact rating, making it suitable for signaling circuits in low-voltage alarm architectures without carrying the main load. Compatible frames include BQD, BQD6, CQD, CQD6, NGG, HGG, LGG, NGB, HGB and LGB, reflecting Siemens’ integration across CQD, NGG and LGB families. The CQDA1BA is part of the alarm switch and auxiliary switch kits used to add signaling capability to existing breakers, and it is intended to extend monitoring options in electrical distribution panels and automation systems.