Honeywell Home Intrusion 503 Fixed Temp Thermal Detector

Product Description

The Honeywell Home Intrusion 503 is a fixed-temperature thermal detector designed to trigger an alarm when ambient temperature reaches 135 degrees F. Fixed-temperature heat detectors are a fundamental component of fire and intrusion alarm systems, activating at a predetermined threshold rather than tracking rate of temperature rise. The 503 is sold as an individual unit and is typically installed by licensed alarm technicians or electricians working on low-voltage fire alarm and security system circuits.

Fixed-temperature thermal detectors like the 503 are used in residential and light commercial applications where smoke detectors are not suitable due to dust, humidity, or airborne particulates — such as garages, attics, utility rooms, and kitchens. The 135-degree F trip point is a standard rate for areas with normally elevated ambient temperatures where a lower-threshold device would produce nuisance alarms.

Key Features

• Fixed activation temperature of 135 degrees F for predictable, threshold-based detection
• Sold as a single unit (each) for straightforward system additions or replacements
• Designed for integration into fire alarm and intrusion detection system circuits
• Suitable for environments where smoke detectors are prone to false activations

Compatibility

Designed as an OEM-style replacement or addition for compatible fixed-temperature thermal detector circuits in residential and light commercial fire alarm and intrusion systems. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a licensed low-voltage alarm technician or electrician in accordance with NFPA 72 and applicable local fire codes. De-energize the alarm control panel and associated circuits before wiring or removing any detector. Follow the control panel manufacturer's wiring diagram for proper zone connection. Verify the detection zone is tested and functionally confirmed after installation.