System Sensor APA151 Remote Annunciator with Piezo Alarm

Deliver audible and visual alarms exactly where you need them. The System Sensor APA151 Remote Annunciator with piezo alarm provides a compact, dependable remote annunciation solution for duct smoke detector installations and other monitoring points. Designed for use with 4‑wire conventional duct smoke detector applications without a central control panel, the APA151 helps you meet NFPA 90A requirements while offering clear on-site notification via a loud piezo alarm and dedicated red (alarm) and green (power) LEDs. Powered by standard 24V DC, this remote annunciator installs quickly and integrates seamlessly into security, fire monitoring and facility surveillance systems. Its shallow 0.5" depth and small footprint make it ideal for tight spaces and centralized annunciator locations. For contractors and facilities managers, the APA151 means faster commissioning, fewer service calls, and more confident compliance with fire and safety codes. Add a reliable System Sensor annunciator to your next duct smoke or security monitoring project to improve situational awareness and response times—order or specify the APA151 for your installation today.

• Provides clear audible and visual indication (piezo alarm plus red/green LEDs) for immediate on-site notification
• Enables NFPA 90A-compliant duct smoke monitoring when no control panel is used, simplifying code compliance
• Simple 24V DC power and 4‑wire compatibility for fast integration with conventional duct smoke detector installations
• Low-profile, compact design (4.6" x 2.9" x 0.5") that mounts easily in mechanical rooms or control closets
• Durable System Sensor construction reduces maintenance and supports reliable security and monitoring operations