SDC 30-4-24U Stainless Steel Electric Strike
The SDC 30-4-24U is a 3/4" Pullman latchbolt electric strike engineered for institutional and commercial high-traffic door installations. Operating at 12VDC or 24VDC, the strike energizes to release the keeper on credential presentation, then locks automatically on power loss — a failsecure design mandated for fire-rated egress doors. All stainless steel housing and internal components resist corrosion and repetitive switching wear; the integrated spacer plate shim accommodates varying faceplate thicknesses without field shimming labor. At 510 mA @ 12VDC draw, the 30-4-24U integrates directly with standard access control system power supplies and monitoring circuits.
Key Features
- Failsecure 12VDC Operation: Energize to unlock; de-energize to lock. Eliminates the capex and configuration complexity of failsafe solenoid selection — one strike fits fire-code requirements across institutional campuses.
- Stainless Steel Construction: 300-series corrosion resistance in harsh or humid environments. No coating degradation, no rust bloom on faceplate or keeper — critical for exterior vestibules and wet zones.
- 3/4" Pullman Compatibility: Works with rim-mount exit devices (pull handles, touchbars) featuring Pullman-type latchbolts or top Pullman latches on vertical-rod exit devices. Confirm exit device model before spec — SDC S6000 series requires alternate strike.
- Non-Handed, Integrated Spacer Plate: Single SKU installs on left or right doors. Shim adjusts faceplate to frame thickness — set screws lock alignment, eliminating on-site metal shim stacks.
- 500,000 Cycle Endurance Rating: UL fire door accessory listing; rated 1,500 lbs static, 70 lbs dynamic. Survives 10+ years of 200+ daily unlocks in high-traffic corridors without mechanical degradation.
- SPDT Status Monitoring: 3 Amp @ 30 VDC contacts report strike state to access control panel or alarm circuit. Integrates with HID readers, Salto, Kaba, or any 12/24VDC system with conventional wiring.
- Dual Voltage Flexibility: 12VDC or 24VDC ± 10% input. Current draw 510 mA @ 12VDC, 250 mA @ 24VDC — allows power budget optimization on large deployments or retrofit to existing infrastructure.
- Pigtail Connector Field Wiring: Terminal block and pigtail connectors reduce in-frame assembly time. No soldering, no terminal crimping — standard electrician labor.
The 30-4-24U is purpose-built for rim-mount exit devices with Pullman-type latchbolts. Confirm that your specified exit device (Panic Bar, Touchbar, or Push Handle) is equipped with a Pullman mechanism and uses a 3/4" throw keeper. SDC publishes compatibility matrices on its datasheet — cross-reference your exit device model before ordering. The strike's non-handed design and integrated spacer plate eliminate SKU proliferation across a multi-building campus; one part number covers left-hand, right-hand, and reverse-bevel installations.
Failsecure operation means the strike locks automatically on power loss, fire alarm trigger, or access control system fault. This is the default requirement for ADA-compliant fire exits, institutional egress routes, and secure perimeter doors. Unlike failsafe strikes (which unlock on power loss), failsecure removes the burden of proving that your access control system is in a "safe" state — it is safe by default. The UL fire door accessory label confirms the strike meets fire-rating endurance and material standards; specify this strike with confidence on fire-rated frame assemblies.
Power consumption (510 mA @ 12VDC, 250 mA @ 24VDC) is moderate; most institutional access control systems provide 12 or 24 VDC loops with 1-2 amp capacity. On large campuses with 40+ doors, verify that your power supply has sufficient amperage budget — a dedicated circuit per 3-4 strikes is standard practice. Pigtail connectors and SPDT contacts simplify wiring to existing HID readers, Salto locks, or conventional Honeywell / Tyco / Genetec panels. The 500,000 cycle endurance rating and stainless steel construction mean minimal lifecycle maintenance — no solenoid coil replacement, no corrosion touch-up.
The SDC 30-4-24U integrates with any access control system that outputs 12 or 24VDC to a relay coil. HID readers, card readers, PIN pads, mobile credential apps (via HID Mobile Access or similar) all work equally well — the strike is hardware-agnostic. SPDT monitoring contacts allow alarm circuits to report strike position (locked/unlocked) back to the access control panel for audit trails and tamper detection. On institutional campuses, this integration is typically handled by the integrator's control system engineer; SDC provides terminal assignments and voltage specs, but the actual wiring and logic configuration belong to the control system design.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the SDC 30-4-24U across dozens of institutional campuses — universities, hospitals, government buildings — where high-traffic egress control and fire code compliance are non-negotiable. The failsecure design alone eliminates an entire class of design questions: "What happens if the access control system goes down?" Answer: doors lock. You don't need a battery backup, a redundant power supply, or a complex failover logic. That simplicity translates to lower capex, simpler commissioning, and fewer end-user phone calls about unexpected door behavior. The stainless steel construction is not cosmetic — in humid loading docks, exterior vestibules, and salt-spray environments, we've seen painted strikes rust through in 3-5 years. Stainless means the faceplate and keeper still look factory-new after a decade. On the compatibility side, confirm your exit device model before you order. Pullman latchbolts are standard on panic bars and touchbars, but some older institutional exit devices use different keeper profiles. A 10-minute cross-reference with the exit device datasheet prevents a site callback. The integrated spacer plate is a real time-saver on retrofit jobs where door frame thickness varies building-to-building — no need to source and install metal shims; the slide-in shim does the job.
Technical Highlights:
- Failsecure 12/24VDC Solenoid: Energize to release, de-energize to lock. No moving parts between the power input and the solenoid latch — extremely reliable. The spike protection circuit handles repetitive switching from momentary relay contacts without coil damage. We've seen units run 500k+ cycles without a solenoid replacement.
- SPDT Monitoring Contacts (3A @ 30VDC): Reports strike position to the access control panel. Integrates with alarm loops, audit trails, and tamper detection circuits. Allows the system to verify that the strike actually released when a credential was presented — critical for compliance and incident investigation.
- Stainless Steel Housing, Keeper, and Internal Components: 300-series steel resists salt spray, humidity, and cleaning chemicals. Faceplate and keeper maintain finish integrity for 10+ years without touch-up. We've seen painted models require repainting every 3-4 years in wet environments; stainless eliminates that labor.
- Non-Handed with Integrated Spacer Plate: One SKU, left or right install. The spacer plate shim adjusts faceplate depth to match door frame thickness — critical on retrofit jobs where frames vary by 1/4" to 1/2" across a building. Eliminates on-site shimming labor and parts staging.
- UL Fire Door Accessory Label, 500k Cycle Endurance: Rated for ADA-compliant fire exits and high-traffic institutional doors. The 1,500 lbs static, 70 lbs dynamic rating reflects real-world loading — users hanging on panic bars, emergency egress pushing through the door. We've never seen a 30-4-24U fail due to mechanical overload.
Deployment Considerations:
- Confirm Pullman Latchbolt Compatibility Before Spec: The 30-4-24U works with rim-mount exit devices that have Pullman-type keepers (panic bars, touchbars, push handles). Some older vertical-rod exit devices use different keeper profiles. SDC provides a compatibility matrix — cross-reference your exit device model number. A wrong keeper means on-site rework and retrofit labor.
- Power Budget Planning on Large Deployments: 510 mA @ 12VDC or 250 mA @ 24VDC per strike. On 40+ door campuses, dedicated circuits per 3-4 strikes are standard. Verify your power supply can handle the load before installation. Under-powered supplies cause solenoid chatter and slow release.
- Fire-Rated Door Frame Installation: The UL label applies only when the strike is installed on a fire-rated frame assembly. If your frame is not fire-rated, the label is moot. Confirm frame rating with the frame manufacturer or inspector before commissioning.
- SPDT Contacts for Audit and Tamper Detection: Wire the monitoring contacts to your access control panel if you need strike position reporting. Without the contacts wired, you have no feedback that the strike actually released — a minor point in low-risk environments, critical in secure facilities.
- Pigtail Connector Routing: The pigtail connectors exit the strike housing at fixed angles. Plan conduit and raceway routing to avoid sharp bends or pinch points that could stress the connector over time.
The 30-4-24U is the right choice for institutional and commercial high-traffic doors where failsecure operation, fire code compliance, and corrosion resistance are mandatory. If you're building a campus-wide access control system, one strike model covers 95% of your rim-mount exit devices. See the SDC catalog for failsafe alternatives and specialty strike models.
