System Sensor 5603 135F Fixed Temp, Single-Circuit Mechanical Heat Detector

Deliver consistent, reliable fire detection where it matters most with the System Sensor 5603 fixed-temperature mechanical heat detector. Designed for security and monitoring applications, this single-circuit heat detector activates at 135°F to provide early, tamper-resistant indication of thermal events without the complexity of electronic sensing. Installers benefit from a reversible mounting bracket and compatibility with single-gang and octagonal back boxes, plus easy-to-use terminal screws that cut labor time on site. The unit’s mechanical collector drops after activation for fast visual identification during inspections or service calls, helping maintenance teams restore protected areas quickly. With a discreet white housing, wired connectivity and a 3-year limited warranty, the 5603 integrates smoothly into fire detection, security and surveillance systems for commercial and residential properties. Specify the System Sensor 5603 for dependable heat sensing in sprinklered or non-sprinklered environments — order now to streamline your next monitoring or security deployment.

• Provides dependable fixed-temperature fire detection to protect people and property, minimizing false alarms and ensuring rapid response
• Single-circuit mechanical design with a visible post-activation collector for quick identification and simple maintenance
• Engineered for easy installation — fits single-gang and octagonal back boxes with reversible bracket for flush or surface mounting
• 135°F fixed activation (also available in higher temperature ranges) for application-specific sensitivity in commercial and residential security systems
• Low-profile white housing and simple terminal screws reduce install time and blend into monitored environments