STI 7521-HTR Heated NEMA 4X Protective Cabinet with Backplate and Thumb Lock, Clear

Protect sensitive fire protection, security and monitoring equipment in harsh environments with the Safety Technology International STI 7521-HTR heated NEMA 4X protective cabinet. This heated enclosure is engineered to maintain an above-freezing internal temperature, allowing smoke detectors, control modules and other devices to operate reliably outdoors, in unheated warehouses or freezer-adjacent locations.

The clear Type 4X polycarbonate cover provides impact and corrosion resistance while enabling quick visual checks without opening the box. Built-in heating supports 12, 16.5 or 24 V power supplies and is governed by three thermostats for precise temperature control and energy efficiency. The wall-mount backplate and exterior thumb lock secure components from vandalism and unauthorized access, simplifying service and reducing downtime.

Designed for low maintenance and long service life, the STI-7521HTR is an ideal enclosure for fire mounting, surveillance cameras, access control electronics and environmental monitoring equipment. Specify this heated cabinet to protect critical assets — contact your distributor or order today to safeguard your systems.

• Keeps critical fire, security and monitoring devices above freezing with an integrated heater and three thermostats for reliable outdoor and unheated-space operation
• Durable Type 4X polycarbonate cover resists vandalism, dust and moisture while allowing quick visual inspections through the clear lid
• Flexible power options (12, 16.5 or 24 V) for easy integration with existing control systems and low maintenance operation
• Secure wall-mount design with enclosed deep backbox and exterior thumb lock to protect equipment from tampering
• Compact, lightweight construction simplifies installation in surveillance, fire protection and industrial monitoring applications