STI STI-7511A-HTR Heated Polycarbonate Enclosure Thumb Lock
Overview
The STI-7511A-HTR is a heated polycarbonate enclosure with thumb-lock access designed to protect electronic equipment in outdoor, cold-storage, and harsh-environment deployments. NEMA 4 rating handles wet, corrosive, and dusty conditions without degradation. The integrated radiant heating element maintains enclosure temperature above freezing—critical where LCD displays, solenoid strikes, or control boards would otherwise become sluggish or fail in sub-zero climates. Polycarbonate construction resists vandalism and impact damage while the thumb lock provides manual override access when power is unavailable. This is the correct choice when you need weatherproof equipment protection combined with freeze-prevention in unheated warehouses, outdoor gate controllers, or remote access-control installations.
Compatibility
The STI-7511A-HTR integrates with door strike assemblies and standard electromechanical access control systems where manual thumb-lock override or scheduled heating is required. Compatible with 12, 16.5, or 24 VAC/VDC power supplies—verify your supply voltage before installation. Fits standard door frame mounting locations for both inset and surface-mounted strike configurations. The thumb lock operates independently of electronic control, making it suitable as a fail-safe manual access point in integrated security systems or standalone barrier installations.
Installation Notes
Mounting hardware and weatherproof seals are included. The radiant heating plate is factory-installed and operates across a polycarbonate temperature range of −40° to 250°F (−40° to 121°C). The enclosure houses three independent thermostats: a control thermostat, a safety (overheat) thermostat, and a thermal warning indicator—verify proper thermostat calibration during commissioning to prevent overcycling or element failure. Ensure power supply connections are made to a dedicated, protected circuit to avoid nuisance heating shutdowns from voltage fluctuation. No field modification of the heating element is recommended.
What's in the Box
- 1x STI-7511A-HTR heated polycarbonate enclosure with thumb lock
- Mounting hardware and weatherproof seals
- Installation documentation
