SDC Z7252 Failsecure Strike with REX Output

SDC Z7252 Failsecure Strike with OSDP and REX Output

The SDC Z7252 is a failsecure electrified cylindrical lockset designed for access control integration in commercial, industrial, and institutional facilities. Operating at 24VDC (field-selectable 12/24 VDC), it combines solenoid-controlled locking with integrated request-to-exit (REX) signaling in a single unit, eliminating the cost and complexity of separate electric strikes or standalone REX modules. OSDP (Open Supervised Device Protocol) connectivity enables seamless integration with third-party access control panels and readers, while mechanical latch retention ensures fire-code compliance and secure door closure during power loss.

Key Features

• OSDP Protocol Support: Open Supervised Device Protocol integration enables supervised communication with any OSDP-capable access control system. Reduces wiring complexity and improves fault detection versus unsupervised relay outputs.
• 24VDC Failsecure Operation: Energize-to-unlock design — door remains locked and latch engaged during power loss or system fault. Field-selectable 12/24 VDC voltage accommodates existing power supplies.
• Integrated REX Output: Built-in request-to-exit signaling eliminates separate REX button/module hardware. Supports emergency egress and fire-code compliant door release without external components.
• Solenoid Strike Control: Works with any access control panel or reader that outputs a solenoid strike signal (supervised relay or OSDP command). No proprietary control boards required.
• Mechanical Lockset Replacement: Retrofit-compatible — replaces most brands of standard cylindrical locksets. Retains mechanical latch operation and fire-door integrity even when electrically unlocked.
• Credential Flexibility: Compatible with proximity cards, keypads, biometric readers, and any credential type supported by your access control panel. Panel determines authentication method, not the strike.
• Vandal-Resistant Clutch: Proprietary solenoid clutch design withstands tamper attempts and forcible entry without functional degradation.
• Standard Cylinder Prep: Accepts 6-pin standard cylinders (keyed alike or different) or SFIC 7-pin I-Core cylinders. Mechanical override capability for emergency access and rekeying.

The Z7252 is part of SDC's Electra 7200 Series, engineered for retrofit and new-construction deployments where access control reliability, code compliance, and operational simplicity converge. Its failsecure design means the door defaults to locked when power is unavailable — a critical safety requirement in healthcare, government, and secure facilities. The integrated REX function eliminates the cost and installation labor of standalone request-to-exit modules, reducing total system capex and simplifying maintenance cycles.

OSDP connectivity is the architectural advantage here. Unlike legacy relay-based strikes, OSDP provides bi-directional communication — your access control panel can query lock status, detect forced-door conditions, and supervise the entire communication path to the strike. This enables audit trails, real-time fault alerts, and integration with modern VMS platforms that consume access events and door-sensor data. Standard relay wiring also remains supported for backward compatibility with older panels.

Installation is straightforward in retrofit scenarios. The Z7252 replaces the existing mechanical lockset without frame or door modification. A 24VDC power supply and regulator module are included; you simply terminate the strike control wire and optional REX input wire into your access control panel's relay outputs or OSDP network. For new construction, it integrates directly into door hardware schedules alongside standard trimwork options — available in Eclipse Rose or Galaxy Rose designs, finished in dull chrome, bright chrome, dull brass, bright brass, dull bronze, bright bronze, or dark oil-rubbed bronze.

Fire-code compliance is inherent: the mechanical latch remains functional even when the solenoid is de-energized, preserving door self-closing behavior and egress route integrity during power loss or emergency evacuation. Facilities requiring ADA-compliant accessible egress will appreciate the integrated REX output — it eliminates the need for a separate push-button or door sensor.

Jerry Tildsen

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

We've deployed the SDC Z7252 across a range of retrofit and new-build access control projects — office campuses, healthcare facilities, government buildings, and data centers. What stands out is how it consolidates three functions (electrified strike, solenoid control, and REX signaling) into a single mechanical lockset form factor. On a 50-door retrofit, that's a real win: no separate electric strike frames to install, no additional REX modules to wire and power, and no proprietary control boards sitting in a closet. The OSDP support means you're not locked into a single access control vendor's architecture — any panel that speaks OSDP can supervise it directly. We've seen integrators pair this with everything from legacy Salto X-Series readers to modern cloud-connected platforms like Genetec Synergis and Openpath. The failsecure behavior is non-negotiable for secure facilities: if power goes down or someone severs the control wire, the door is locked. That's the opposite of a fail-to-open system, and it's what you want in any high-security application.

Technical Highlights:

• OSDP Bi-directional Supervision: Unlike supervised relay circuits, OSDP provides command/response acknowledgment and real-time lock status polling. Door-forced alerts, tamper detection, and audit-trail integration drop in automatically when paired with OSDP-capable panels.
• 24VDC Failsecure with Mechanical Latch Retention: Energize-to-unlock means the door cannot be held unlocked in a power-loss scenario. Mechanical latch stays engaged, preserving fire-rating and egress compliance without reliance on UPS or battery backup on the strike itself.
• Integrated REX Signaling: Eliminates standalone REX button, wireless REX, or motion-sensor dependencies. A simple normally-open contact from a request-to-exit button or card reader triggers the panel to de-energize the solenoid. Reduces BOM and service calls on REX failures.
• Field-Selectable 12/24 VDC: Retrofit installers can match voltage to existing power infrastructure without replacing panels or supplies. We've used this flexibility to simplify mixed-voltage deployments across multi-building campuses.
• Solenoid Clutch Design: The proprietary clutch mechanism withstands repeated tamper attempts (pick attempts, wrench attacks) without losing function. Not a guarantee of forced-entry resistance, but it outlasts cheaper electromagnetic latches on high-traffic or hostile doors.

Deployment Considerations:

• Verify your access control panel provides a solenoid strike relay output (24VDC supervised or OSDP-controlled) before specifying. Older panels without strike outputs require a separate controller or relay module — that adds cost and complexity.
• REX input is optional but highly recommended for ADA and life-safety compliance. Budget a NO contact from a push-button, card reader, or motion sensor to the panel's REX input. Without it, you're back to a manual key-turn for emergency egress.
• Mechanical rekeying capability is built-in (6-pin or SFIC cylinders), but the solenoid control is not field-serviceable. If the solenoid fails, the entire lock assembly must be replaced — factor that into lifecycle cost planning.
• Power consumption is low (typically <1A at 24VDC during unlock), so most access control power supplies can handle 8-12 Z7252 strikes on a single 24VDC circuit. Verify your panel's strike relay rating and draw budget before parallel-wiring multiple doors.
• On retrofit projects, confirm door frame geometry (backset, bore size) before ordering. Standard cylindrical lockset trim must physically fit existing door prep — measure twice, order once.

The Z7252 is the right choice for integrators and facility managers who want to move beyond standalone electric strikes and simplify access control architectures. If you're deploying a new OSDP-based system or upgrading an aging relay-based setup, this product eliminates a meaningful amount of hardware and wiring complexity. For more options across SDC's electrified lockset portfolio, visit the SDC catalog.