Honeywell Home 502 Combination Fixed Temperature Thermostat at 135° - Normally Open

Built to provide dependable heat detection where consistent performance matters, the Honeywell Home 502 Combination Fixed Temperature Thermostat is ideal for security, fire detection and equipment monitoring applications. As a fixed-temperature thermal detector set to 135°F with a normally open configuration, it offers predictable activation behavior that simplifies integration into alarm panels, surveillance systems and building management setups. Installation is efficient thanks to a 0.251" reamed ram end for tooling attachment and a reversible 0.75" square ram (5.875" long) capable of exerting up to 1/4 ton (500 lb), while four adjustable nylon gibs maintain smooth mechanical movement and long service life. Designed by Resideo under the Honeywell Home brand, the 502 model blends rugged construction with installer-friendly features so you can maintain reliable temperature monitoring across facilities. Choose the Honeywell Home 502 to strengthen your security and monitoring strategy—perfect as a direct replacement or a durable addition to control panels and surveillance-driven safety systems.

• Dependable 135°F fixed activation delivers consistent heat detection for security, fire monitoring and industrial temperature control
• Normally open contact for straightforward integration with control panels, surveillance and alarm systems
• 0.251" reamed ram end simplifies tooling attachment and on-site installation, reducing setup time
• Reversible 0.75" square ram with up to 1/4 ton (500 lb) capacity and four adjustable nylon gibs ensures smooth, reliable mechanical operation
• Rugged Honeywell Home construction designed for long-term reliability in commercial and industrial environments