STI SS2229EM-EN Stopper Station Push Button with Shield
Overview
The STI SS2229EM-EN is a push button assembly designed for emergency egress and access control applications requiring both security and rapid egress capability. This unit combines a push button actuator with an integrated protective shield and operates at 30VDC, making it compatible with magnetic lock strike systems. The NEMA Type 23 rated enclosure protects the internal mechanism from environmental exposure, supporting both flush and surface mount installations on standard door frames.
Key Features
- 30VDC Operating Voltage: Designed specifically for magnetic lock systems operating at 30VDC — matches most commercial-grade electric strike installations without requiring voltage conversion or step-down transformers.
- Integrated Protective Shield: Built-in shield guards the push button actuator from accidental damage, intentional strikes, and weathering — reduces maintenance calls in high-traffic or institutional environments.
- NEMA Type 23 Enclosure Rating: Protects against dust, rain, and light spray. Skip this model if you need full environmental protection against submersion or extreme corrosion — consider stainless steel variants for coastal or chemical-spray environments.
- Compact Footprint: Unit measures 6.36 inches wide by 3.22 inches tall with 1.25 inches installation depth (when anchors not used). Fits within standard door frame geometry without requiring structural modification.
- Flush or Surface Mount: Supports both mounting styles — flush installation sits recessed into the door frame for a clean aesthetic; surface mounting works when door thickness or frame type prevents recessed installation.
- Standard Fastening: Requires 3/16-inch diameter drill holes for mounting. Compatible with common threaded anchors and bolts found in industrial supply chains.
Installation and Integration
The SS2229EM-EN mounts directly to standard door frames using provided drill hole templates. Electrical connection links to the 30VDC power supply and the magnetic lock strike coil — a low-voltage DC loop that energizes the lock when the button is pressed. Installation kits with pre-drilled templates are available, reducing on-site drilling and frame damage risk. Wire the push button in series with the strike circuit; most integrators include a relay or electric strike controller to manage button debounce and hold time.
The unit does not require an external power supply of its own — it acts as a control interface between the button press and the existing 30VDC strike power circuit. Confirm your magnetic lock strike is rated for 30VDC operation before installation to avoid mismatched voltage and coil burnout.
When to Choose a Different Model
If your application requires IP67 (full immersion tolerance) or stainless steel construction for corrosive environments, contact the STI catalog for variants with enhanced materials. If you need wireless or smart credential integration (card reader, keypad, proximity), select an access control-grade push button with integrated electronics rather than this passive mechanical strike button.
Frequently Asked Questions
Q: Is the SS2229EM-EN compatible with 12VDC magnetic locks?
A: No. This unit is engineered for 30VDC operation only. Using it with a 12VDC system will not energize the strike. Confirm your strike coil voltage before purchase.
Q: Can I use the SS2229EM-EN outdoors?
A: The NEMA Type 23 rating protects against dust and light rain, but not prolonged submersion or salt spray. For coastal or full-outdoor installations, verify weather exposure and consider protective overhang or housing.
Q: What fasteners are included in the installation kit?
A: Installation kits typically include mounting templates and hardware for 3/16-inch anchor holes. Confirm specific fastener counts and materials when ordering the installation kit separately.
Q: Does the SS2229EM-EN require a separate relay or controller?
A: The button itself is a passive switch. Most integrators wire it in series with the strike circuit through an electric strike controller or relay to manage power sequencing, hold time, and safety interlocks. This is standard practice in ADA-compliant egress applications.
Q: Can I mount the SS2229EM-EN on aluminum door frames?
A: Yes. Standard 3/16-inch fasteners work with aluminum frames. Ensure the drill holes are sealed or bushed to prevent corrosion at the fastening points, especially in humid environments.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The STI SS2229EM-EN sits at the intersection of mechanical simplicity and voltage specificity — and that specificity is both its strength and its constraint. At 30VDC, this push button is built for environments where the magnetic lock strike is already running high-voltage DC, which means you avoid the cost and complexity of step-down transformers or dual-power-supply designs. That's real money saved on a 50-door installation.
Technical Highlights:
- 30VDC Direct Operation: Eliminates transformer overhead — your strike coil gets full voltage directly from the push button circuit. On a 20-door entry, avoiding transformers on each door saves roughly $400–600 in BOM and installation labor.
- NEMA Type 23 Enclosure: Protects against dust and light rain, but not chemical spray or salt fog. If your site is indoors or under cover, this rating is sufficient; outdoor coastal sites need stainless steel or additional weatherproofing.
- Integrated Shield: Takes the impact of a hard push or kick without compromising the actuator mechanism. In high-traffic hospitals, warehouses, or emergency egress corridors, this feature cuts replacement cycles from yearly to multi-year intervals.
Deployment Considerations:
- Confirm your magnetic lock strike is 30VDC before ordering — mismatch is the most common field failure. If your site is a retrofit with 12VDC strikes already in place, you'll need a voltage step-up, which defeats the simplicity advantage.
- The 1.25-inch installation depth assumes standard door frame thickness (1.75–2 inches). Thin glass or fiberglass frames may require surface mounting, which reduces the protected aesthetic and exposes more of the housing to traffic.
Deploy the SS2229EM-EN in institutional or commercial spaces where 30VDC magnetic lock infrastructure is already in place and egress speed is non-negotiable — schools, hospitals, office buildings with controlled emergency exits. Skip it if you're mixing voltage standards or need edge-case environmental ratings.
