STI Break Glass Protective Cov...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$58.07
STI Break Glass Protective Covers – Fire & Security Access Models

STI Break Glass Protective Covers – Fire & Security Access Models

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Model: STI‑4100

In Stock (leaves warehouse same day if ordered before 3pm ET)

$58.07
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STI Break Glass Protective Covers – Fire & Security Access Models

The STI Break Glass Stopper® Series provides secure yet accessible storage for emergency keys, fire alarm pull stations, and similar devices. Constructed from durable polycarbonate or ABS, these covers deter theft and false activation by requiring the glass to be broken for access. Available in multiple sizes and languages, with surface or flush mount options, the Break Glass Stopper is a cost-effective, fast-install solution for safety and security in schools, businesses, and public buildings.

Key Features

  • Keeps emergency keys or fire alarms visible but secure
  • Durable polycarbonate or ABS housing for long-lasting protection
  • Requires breaking the glass for access – strong theft deterrent
  • Fast installation with included screws and anchors
  • Optional gaskets for weather resistance (outdoor use)
  • Multiple sizes (small or large) and mounting types (flush or surface)
  • Available with English, French, or Spanish glass labels
  • Three-year guarantee against breakage of the housing in normal use

Product Specs

Accessories:
Spacers, Gaskets, Replacement Glass & Tools
Application:
Fire Alarm Pull Stations, Emergency Keys, Generic Break Glass Usage
Certifications:
UL Listed (select models)
Functions/Labels:
Standard Cover, Emergency Cover, Keys Under Glass, Generic Break Glass
Parent SKU:
STI-BREAK-GLASS-STOPPER-SERIES
Product Line:
STI Break Glass Stopper® Series
Warranty:
3 Years on Housing (Normal Use)
Cover Design:
Break Glass Protective Cover
Sizes Available:
Small (STI-6100, 6700, 6720) / Large (STI-4100, 4100EM, 4130)
Product Group:
Safety
Product Subgroup:
Protective Covers
Product Type:
Break Glass Protective Covers – Fire & Security Access Models
Department:
Safety
Glass Specification:
Breakable Glass (replacement available)
Installation Options:
Flush Mount or Surface Mount (varies by model)
Product Material:
UV-Stabilized Polycarbonate Housing

Parts & Accessories

Parts & Accessories Diagram

    Safety Technology International STI‑4100 – Frequently Asked Questions

    1) What is the difference between the small and large STI Break Glass Stopper covers?
    The STI Break Glass Stopper Series splits into two size families: small covers are the STI-6100, 6700 and 6720, and large covers are the STI-4100, 4100EM and 4130. The large covers are the ones used over fire alarm pull stations, including a version with EMERGENCY text on the glass. The small covers are used both over pull stations and for keys-under-glass or generic break glass applications. Pick the family by what you are covering, then pick flush or surface mount.
    2) Is the STI Break Glass Stopper UL Listed?
    UL Listing applies to select models in the Break Glass Stopper Series, not to every part number in the family. If your fire marshal or AHJ is requiring a listed cover over a pull station, specify the listed model when you order rather than assuming the whole series carries it.
    3) I want to store a master key or an elevator key behind glass in a stairwell. Which model do I use?
    That is the keys-under-glass application, and it uses a small flush mount cover rather than a large fire alarm cover. Small keys/generic covers are offered with standard breakable glass and also in a plexiglass version. The point is the same either way: the key stays visible so staff can see it is there, and access requires breaking the pane, which makes unauthorized use obvious.
    4) Can these break glass covers be used outdoors or in a wash-down area?
    Outdoor use is handled with the optional gasket. The housing itself is UV-stabilized polycarbonate, so it holds up to sunlight, and gaskets are listed among the accessories for weather resistance. Order the gasket with the cover if the opening is exterior or exposed.
    5) What wording can I get on the glass, and does it come in Spanish or French?
    Glass labels are available in English, French or Spanish, so bilingual buildings and Canadian sites can be matched. On the cover itself the label options are standard cover, an EMERGENCY version, keys under glass, and a generic break glass version with no application-specific wording.
    6) Do I need to buy mounting hardware separately for an STI break glass cover?
    No. Screws and anchors ship with the cover, so a single unit goes up on drywall or masonry without a separate hardware pickup. What you may still need to add is a spacer if conduit stands the station off the wall, or a gasket for an exterior location.
    7) Will a break glass cover stop students pulling the fire alarm?
    It is a deterrent, not a lock. Because access requires breaking the glass, a nuisance pull becomes deliberate, noisy and leaves physical evidence, which is why schools and public buildings use them. If you want an alarm that sounds the moment the cover is lifted, that is a different STI product line; the break glass models rely on the broken pane itself.
    8) Should I pick the glass or the plexiglass version of the small cover?
    Glass is the standard pane and breaks cleanly with the supplied tool, which is what most fire and key applications specify. A plexiglass version is offered on the small keys/generic cover for places where broken glass fragments are a concern, such as corridors with heavy foot traffic or areas serving children. Replacement panes are ordered by the kit number matching the model.
    How fast can I get the Safety Technology International STI‑4100 delivered?
    Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
    Can I return it if it doesn’t work for me?
    Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
    Does the Safety Technology International STI‑4100 come with a warranty?
    Absolutely. The Safety Technology International STI‑4100 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
    How do I get technical support or installation help for the Safety Technology International STI‑4100?
    You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
    Why buy the Safety Technology International STI‑4100 from ZenSupply?
    ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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