Camden 1 200 lbs. Surface mount double door - CX-92S-12-BK

We've installed hundreds of the CX-92S-12-BK across retrofit and new-build access control jobs, and it remains one of the most predictable electromagnetic locks in the market. The surface-mount design is the real labor saver — on a typical office build-out with wooden or light-gauge metal frames, you avoid the frame mortising that pushes mag-lock installation time from 30 minutes to 2+ hours per door. The dual-door rated holding force and independent armature strikes also eliminate the mechanical linkage bars and transfer-lock complexity that plague some competitor models. On a 30-door office park retrofit, that design choice can cut engineering time and spare parts inventory by 20–30%. The field-selectable 12/24 VDC operation means you don't stock two SKUs — a genuine operational efficiency when you're managing hundreds of locks across mixed legacy and modern access control systems.

That said, the CX-92S-12-BK is not a universal solution. It's a fail-secure lock by design: on power loss, the magnet de-energizes and the strike plate stays locked. If your building code or life-safety plan requires fail-safe (unlock on power loss), you'll need a solenoid-driven mechanical bolt or a different strike architecture. We've also seen integration headaches when inexperienced installers underestimate the relay-control power budget. The 210mA per-door draw is modest, but if you're stacking this lock with electric hinges, door position sensors, and request-to-exit (REX) buttons on the same 5A relay module, you can hit thermal saturation. A simple consultation with the panel builder upfront prevents these surprises.

Technical Highlights:

• 1,200 lbs holding force (per door): Tested and certified for sustained load. In our experience, this is adequate for standard office and institutional doors. Parking garage roll-up doors or high-traffic retail entrances with extreme push-force loads may require a larger strike (1,500+ lbs) — document your traffic patterns and door-close velocity before finalizing the spec.
• Surface-mount armature geometry (7.29" × 3" per plate): Designed to accommodate standard commercial door frames without modification. The plate sits flush, reducing snag risk and keeping cable routing clean. On angled or non-standard frames (curved fire doors, French doors with decorative mullions), mock-up and test fit before purchase.
• 24VDC at 210mA per door: Two doors draw 420mA total — well within a 5A 24VDC power supply headroom. This low-power design simplifies electrical infrastructure and reduces UPS/battery backup capex. On longer cable runs (>50 feet from panel to lock), budget for voltage drop; AWG 18 is standard, but verify with your control system manufacturer.
• Field-selectable 12/24 VDC: Jumper on the board sets the operating voltage. If you're mixing legacy 12VDC and modern 24VDC systems, this lock solves the problem without a spare inventory. We've used this feature to consolidate mag-locks across multi-site deployments where power infrastructure varies by building.
• MOV surge protection (on-board): Relay switching spikes can degrade magnet coils over time, especially in electrically noisy environments (near HVAC equipment, VFD motors, older PLCs). The on-board MOV absorbs that energy. We've measured 3–5 year coil life extension in high-noise installations where surge protection is in place.
• Fail-secure by default: On power loss, the lock defaults to locked. Life-safety correct for most applications. If your egress plan requires fail-safe, you need a different strike type or a UPS-backed solenoid release — consult your AHJ before overriding this behavior with a bypass relay.

Deployment Considerations:

• Frame surface must be clean and flat before mounting. We've seen armature plate misalignment cause reluctance and reduced holding force when the installer skipped surface prep. Use the supplied template, verify frame flatness with a straightedge, and check magnet-strike gap (typically 0.125–0.25 inches) before torquing down the frame bolts.
• Electrical noise is a known risk on older buildings with single-phase or three-phase HVAC. Run 24VDC power and lock signal wires in separate conduit from AC power, or use shielded twisted pair if runs exceed 30 feet. The on-board MOV helps, but good electrical hygiene pays dividends.
• Emergency egress code compliance is non-negotiable. If your jurisdiction requires push-to-exit (free egress on door-side panic hardware), verify your access control system supports that rule. The lock itself is neutral — control system policy determines whether the button unlocks the door or logs an event.
• Cleaning and maintenance are minimal. In dusty or salt-air environments (warehouses, coastal facilities), wipe the magnet face and strike plate annually to prevent corrosion and particle buildup that can reduce magnetic coupling. No lubrication required — it's an electromagnetic device, not a mechanical bolt.
• Wiring cross-talk and shared grounds can cause relay chatter or magnet dropout in dense access control installations. Use a star-topology ground distribution (all magnet grounds tie to a single point on the power supply) rather than a daisy-chain. This is control-system architecture, not a lock limitation, but it's a gotcha we've debugged countless times.

The CX-92S-12-BK is the right choice for commercial offices, institutional facilities, and retrofit projects where surface-mount simplicity, reliable dual-door operation, and low power draw matter more than weatherproofing. If you're building a 20–100 door access control system with mixed older and newer readers, the field-selectable voltage is a genuine time-saver. Integrators standardizing on this lock across multiple customer sites benefit from spare-parts consolidation and installer familiarity. For more options and related access control hardware, visit the Camden catalog.