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STI Protective Cabinets – Type 4X Polycarbonate Lockable Enclosures
STI Protective Cabinets are rugged, lockable enclosures designed to safeguard critical devices such as fire alarm panels, control equipment, and annunciators from damage, vandalism, and the environment. Constructed of UV-stabilized polycarbonate—the same tough material used in football helmets—these multipurpose cabinets offer a high level of visibility and durability. Available in a wide range of configurations, they include key or thumb lock options and models with siren or siren/strobe alarms. External mounting tabs and included hardware ensure easy wall installation. Many models are UL and Type 4X certified for industrial and commercial applications.
Key Features
- Constructed from UV-stabilized polycarbonate (Type 4X rated)
- Protects electronics from physical damage, dirt, and grime
- Internal steel mounting plate included (most models)
- Clear or white finish options depending on the model
- Mounts externally to walls with included hardware and gasket
- Alarm options: siren only, or siren with strobe
- Available with key lock or thumb lock
- Secondary eyelet for safety seal or padlock
- UL/cUL S7255 Listed, UL38, UL50, UL2017 certified (select models)
- Temperature range: -40°F to 250°F (-40°C to 121°C)
- 3-year guarantee on polycarbonate, 1-year on electronic components
| Model | Height (in) | Width (in) | Depth (in) |
|---|---|---|---|
| STI-7520 | 19" | 16.5" | 6.44" |
| STI-7520OB | 19" | 16.5" | 6.44" |
| STI-7520-OW | 19" | 16.5" | 6.44" |
| STI-7521 | 19" | 16.5" | 6.44" |
| STI-7521OB | 19" | 16.5" | 6.44 |
| STI-7521-OW | 19" | 16.5" | 6.44" |
| STI-7522 | 19" | 16.5" | 6.44" |
| STI-7523 | 19" | 16.5" | 6.44" |
| STI-7524 | 19" | 16.5" | 6.44" |
| STI-7525 | 19" | 16.5" | 6.44" |
| STI-7530 | 23" | 19.46 | 8.875" |
| STI-7531 | 23" | 19.46" | 8.875" |
| STI-7532 | 23" | 19.46" | 8.875" |
| STI-7533 | 23" | 19.46" | 8.875" |
| STI-7534 | 23" | 19.46" | 8.875" |
| STI-7535 | 23" | 19.46" | 8.875" |
Manufacturer Resources
VIEW SPEC SHEET
Product Specs
- Product Line:
- STI Protective Cabinets
- Material:
- UV-Stabilized Polycarbonate with Steel Mounting Plate
- Alarm Options:
- None, Siren, or Siren + Strobe
- Ingress Rating:
- Type 4X (STI-7520 & STI-7530 Series)
- Warranty:
- 3 Years (Polycarbonate), 1 Year (Electronic Components)
- Accessories:
- Mounting Hardware, Gasket, Optional Wire Shelf, Siren Replacement Kits
- Back Box Option:
- Frosted, Clear, Open, or White
- Flame Rating:
- 94V-2
- Lock Option:
- Key Lock or Thumb Lock
- Certifications:
- UL/cUL S7255, UL38, UL50, UL2017 (select models)
- Mounting Options:
- External Surface Mount (Includes Hardware and Gasket)
- Operating Temperature:
- -40°F to 250°F (-40°C to 121°C)
Parts & Accessories