STI STI-4100EM Break Glass Stopper Large Emergency Key Protection
Overview
The STI-4100EM is STI's large-format Break Glass Stopper — a wall-mounted enclosure designed to keep emergency keys, fire alarm keys, and exit door keys both secure and immediately accessible when it counts. The glass panel acts as a visible deterrent: anyone reaching for the key has to break the glass first, creating a clear record of unauthorized access. This is the large model in the STI keybox range, sized at 173mm wide × 229mm tall × 38mm deep — larger than the medium STI-6700 and small STI-6720, making it practical when you need to store longer keys, access cards, or small documents alongside critical keys.
Key Features
- Break-glass deterrent panel: The glass front creates a meaningful barrier against casual theft or misuse. Anyone who breaks it to access the keys leaves obvious physical evidence — useful for incident documentation in commercial and institutional settings.
- Large enclosure (173mm × 229mm × 38mm): At 229mm tall and 173mm wide, the STI-4100EM (often searched as STI 4100EM) accommodates larger key sets, longer key fobs, and small access documents that won't fit the smaller models in the range. If your fire panel or elevator keys are oversized, start here.
- Keys remain visible through the panel: Staff can confirm the keys are present without opening or touching the box — important in daily walk-through compliance checks or fire warden routines.
- Inexpensive replacement glass: The KIT-10 replacement glass is available separately, so a break-in event doesn't require replacing the entire unit. Reset cost is low, which matters in high-incident or high-traffic environments.
- Complete fixing kit included: Comes supplied with a full wall-mounting kit, so installation doesn't require sourcing separate hardware. Wall-mount the unit to any solid surface where the keys need to be accessible without delay.
- Three-year enclosure warranty (ABS housing): The ABS housing carries a three-year warranty against breakage under normal use conditions — confirmed across the STI keybox product line documentation.
Integration and Compatibility
The STI-4100EM is a passive, non-electronic device — no wiring, no power, no network integration required. It fits into any emergency preparedness plan, fire safety compliance setup, or physical security deployment without any system dependencies. Pair it alongside your access control hardware or near exit routes where fire alarm keys or panic hardware keys need to be staged. For facilities already using STI's break-glass call point covers or alarm protectors, the STI keybox range extends that same deterrent logic to key management. Replacement glass (KIT-10) is available as an accessory and should be kept on-site for fast reset after any break-in event.
Frequently Asked Questions
Q: What size is the STI-4100EM enclosure?
A: The STI-4100EM measures 173mm wide × 229mm tall × 38mm deep (front view dimensions). It is the largest model in the STI keybox range.
Q: Is replacement glass available for the STI-4100EM?
A: Yes. The KIT-10 replacement glass is designed specifically for the STI-4100EM (STI-4100 series). Keeping a spare on-site lets you reset the unit quickly after any break-in event.
Q: Does the STI-4100EM require any wiring or power?
A: No. The STI-4100EM is a fully passive, non-electronic device. It mounts to a wall using the included fixing kit and requires no power supply or network connection.
Q: What is the warranty on the STI-4100EM?
A: STI provides a three-year warranty against breakage of the ABS housing under normal use conditions, as documented across the STI keybox product line.
Q: How does the STI-4100EM differ from the STI-6700?
A: The STI-4100EM is the large model (173mm × 229mm × 38mm). The STI-6700 is the medium model (137mm × 168mm × 32mm). Choose the STI-4100EM when you need to store larger or longer keys that won't fit the medium enclosure.
The STI-4100EM is the one to specify when the medium keybox just doesn't cut it — at 173mm × 229mm × 38mm, it's the largest enclosure in the STI keybox range and the right call for facilities storing oversized fire panel keys, elevator keys, or multi-key rings that would be a tight fit in the STI-6700. The break-glass mechanism is simple but operationally meaningful: it creates an undeniable physical record of unauthorized access, which matters when you're running incident reports or managing compliance audits.
Technical Highlights:
- Large format (229mm tall): At 229mm in height, this enclosure handles longer keys and bulkier key fobs that the medium (168mm) and small (105mm) models can't accommodate — size the box to your largest key, not your smallest.
- KIT-10 replacement glass: Purpose-matched replacement glass for the STI-4100 series keeps reset cost low after a legitimate or unauthorized break-in. Stock one on-site; it's a fast swap and avoids a full unit replacement.
- ABS housing, 3-year warranty: The enclosure carries a three-year warranty against housing breakage under normal conditions — a practical assurance for a device that's expected to take occasional physical contact in busy corridors or plant rooms.
Deployment Considerations:
- Mount at a height accessible to all staff who may need emergency access — the keys remain visible through the glass panel, which supports daily compliance walk-throughs without opening the unit.
- This is a passive device with no electronic integration. If your site requires monitored key access (tamper alerts, audit logging), you'll need to pair it with a separate alarm contact or electronic key cabinet — the STI-4100EM on its own provides physical deterrence only.
Best fit for commercial buildings, industrial facilities, and institutional sites — schools, hospitals, manufacturing plants — where fire exit or alarm keys must be staged at specific locations and protected from casual misuse without being locked away from emergency responders.
