SDC 491P Break Glass Emergency Door Release with Siren 3V-28V DC, 18mA

When seconds matter, the Security Door Controls SDC 491P Break Glass Emergency Door Release with Siren delivers fast, unmistakable emergency signaling and dependable egress control. This emergency & lockdown button combines a break-glass actuator with an integrated siren to provide immediate audible alerting while triggering access control or alarm systems for rapid lockdown and incident response. Built to work with a broad range of installations, the 491P accepts 3V–28V DC input and draws just 18mA in normal operation, making it energy-efficient and compatible with existing power supplies and control panels. The low‑power design and straightforward wiring reduce installation time and ongoing maintenance, while the durable actuator resists tampering and accidental activation. Ideal for schools, healthcare facilities, commercial buildings and mission-critical sites, the SDC 491P supports enhanced security, monitoring and surveillance workflows by delivering clear, actionable alarms to your security infrastructure. Add reliable, audible emergency signaling to your access control plan—specify the SDC 491P for your next lockdown or life-safety upgrade and contact your distributor to order or integrate it into your system today.

• Immediate, one-step emergency activation with audible siren to alert staff and trigger lockdown procedures
• Wide compatibility with 3V–28V DC systems, making integration with most access control and alarm panels straightforward
• Ultra-low standby current (18mA) minimizes power draw while remaining ready for critical events
• Robust break-glass actuator provides a clear, tamper-resistant emergency interface for personnel
• Designed for seamless monitoring and surveillance integration to feed alarms into building management and security systems