System Sensor 5603 135F Fixed Temp Single-Circuit Mechanical Heat Detector is designed to provide dependable fixed-temperature fire detection in conventional alarm systems. Featuring a 135°F activation point, flexible mounting options, and easy visual identification, it delivers reliable performance across a wide range of residential and commercial applications.

• Fixed 135°F temperature activation provides dependable heat detection for conventional fire alarm systems
• Single-circuit mechanical design offers reliable operation in applications where smoke detection may not be suitable
• Compatible with single-gang, 3.5-inch and 4-inch octagonal, and 4-inch square back boxes with plaster ring
• Reversible mounting bracket supports both flush-mount and surface-mount installations
• Post-activation indicator and clearly marked housing simplify detector identification and maintenance