The STI STI-7521 is a clear polycarbonate NEMA Type 4X protective cabinet with exterior thumb lock and a frosted polycarbonate back box. First, the installer mounts the back box on the wall. Then the hinged clear cover locks with the exterior thumb lock. As a result, the STI-7521 shields a wall-mounted device against vandalism while staying transparent for routine inspection.
What the STI STI-7521 is built for
Annunciators, fire alarm control panels, and similar electronic devices need physical and environmental protection. However, an opaque cabinet hides the device and complicates inspections. Therefore, the STI-7521 uses a clear cover for visibility and a frosted back box for cable concealment.
Verified STI STI-7521 specifications
- Type: NEMA Type 4X polycarbonate protective cabinet with backplate
- Cover: Clear polycarbonate, hinged
- Back box: Frosted polycarbonate
- Lock: Exterior thumb lock; additional opening for a secondary padlock or safety seal
- Standard: NEMA Type 4X; UL/cUL approved
- Materials: UV-stabilized polycarbonate
- Polycarbonate working range: -40° to 250°F (-40° to 121°C)
- Dimensions: 8.875" H x 10.875" W x 3.625" D
- Included: Mounting hardware and gasket
- Warranty: Three-year guarantee against polycarbonate breakage in normal use
When the STI STI-7521 is the right choice
Specifically, the STI-7521 fits installations where the protected device needs both NEMA 4X environmental protection and visibility. For example, a wall-mounted fire alarm annunciator in a public corridor. Also, the secondary padlock opening allows tamper-evident seals during sensitive maintenance windows.
Application context
If the installation needs heat (cold storage or exterior), step up to a heated NEMA 4X variant. Therefore, scope environmental conditions before specifying. In addition, the STI-7521 is a protective cabinet, not a listed fire alarm component itself.
Need help selecting the right STI cover or enclosure for your installation? Our team supports thousands of commercial fire alarm jobs every year. Call us at 1-888-557-0558 or email sales@lifesafetycom.com for application guidance, lead-time updates, or volume pricing.
Additional information
| Weight | 5 lbs |
|---|---|
| Dimensions | 12.5 × 12.5 × 5 in |
| Condition | New |
| Manufacturers | STI |
| Part Type | Replacement Part |
| Key Features | Search page, STI Global (Americas) Safety Technology InternationalCompareMy ListProductsFire Products, Alarms, Buttons &, Switches, Enclosures &, Covers, Wire Cages, Wireless Products, Build It Configurators |
| Dimensions | 1200×630. |
