Camden CM-5040 Push/Pull Electronic Strike 30VDC N/C
The Camden CM-5040 is a 30VDC push/pull electronic strike engineered for fail-secure, maintained normally-closed (N/C) operation in retrofit and new-build access control installations. Unlike momentary strikes that energize to release and de-energize to lock, the CM-5040 remains mechanically locked until the access control panel explicitly de-energizes the coil — a critical requirement in high-security entries, stairwells, and secured perimeter doors where you cannot risk a strike returning to unlocked state due to power loss or relay dropout. Red finish offers visual identification at the hardware level, aiding installation crews and maintenance technicians in field verification.
Key Features
- 30VDC Operating Voltage: Direct compatibility with standard access control power supplies and maintained relay outputs. Integrates into systems where the controller energizes the strike coil to maintain the unlock state, then de-energizes to lock.
- Normally Closed (N/C) Maintained Logic: Strike defaults to locked position (mechanical fail-secure) when de-energized. Requires sustained 30VDC signal from control panel to release — eliminates risk of accidental unlocking on power transients or relay chatter.
- Push/Pull Mechanism: Accommodates both inbound (push) and outbound (pull) door swing directions without mechanical reversal. Simplifies retrofit installations where door swing may be field-determined.
- Red Finish: Anodized or powder-coated red housing for rapid visual identification on job site and in the field. Reduces installation errors when wiring multiple strikes across a large deployment.
- Wall Mount Configuration: Bolts directly to door frame or strike box. Supplied hardware and bolt pattern standardized across Camden product line for integration into unified strike strategies.
- Manufacturer Warranty: Factory-backed warranty covers defects in materials and workmanship under normal operating conditions. Consult datasheet for warranty duration and claim procedures.
- Access Control Native Integration: Designed for panel-level or relay-output control — no intermediate driver or power module required if your controller can source sustained 30VDC at the strike coil current draw.
Fail-Secure Operation & N/C Wiring
The CM-5040's maintained N/C design is the operational heart. In fail-secure mode, the strike locks whenever the 30VDC signal drops — whether due to intentional de-energization, power supply failure, or network outage. This architecture suits controlled-egress doors (secured stairwells, server rooms, secure storage) where unauthorized entry is the primary threat and you cannot tolerate a strike that unlocks if power is lost. Wire the strike directly from a dedicated 30VDC relay output on your access control panel or from a maintained power supply line supervised by your controller. On successful credential verification, the panel energizes the relay, holding 30VDC across the strike coil for the programmed unlock dwell time (typically 1–10 seconds). When dwell expires or the next credential is invalid, the panel de-energizes the relay, and the strike locks mechanically — no springback, no solenoid release.
Integration with Access Control Systems
The CM-5040 integrates into any access control platform capable of supervised relay output — Salto, HID VertX, Honeywell ProWatch, Lenel OnGuard, Genetec Security Center, and legacy hardwired controllers all support 30VDC maintained strike control via standard electromagnetic relay modules. Confirm your power supply has sufficient capacity: a typical push/pull strike draws 0.5–1.5A at 30VDC during energization, requiring a 20–45W supply headroom per strike. In multi-door installations, size the power supply to handle peak load (all strikes energized simultaneously) plus 20% overhead. Use shielded twisted-pair or multi-conductor cable in conduit, especially in environments with high-frequency noise (HVAC variable-frequency drives, RF systems). Voltage drop over runs exceeding 50 feet may require one gauge step-up (e.g., 14 AWG → 12 AWG) or a dedicated 30VDC supply within 30 feet of the strike to ensure the coil receives minimum holding voltage (typically 27VDC) at the terminals.
Retrofit & Field Deployment
The push/pull mechanism and modular red housing make the CM-5040 a popular choice in retrofit scenarios where door swing direction is determined late in planning or varies across a building phase. No mechanical reversal kit is needed — install, wire, and test. Wall-mount installation requires four bolts into the door frame; ensure the strike pocket or frame cutout is roughed in to tolerance before delivery to site. In high-traffic entries, the push/pull design accommodates both assisted-opening hardware and manual ADA-compliant push/pull handles. Test the strike under full access control supervision before final sign-off: energize the relay, verify mechanical release, then confirm re-locking within one second of de-energization. In cold-weather climates or industrial environments with condensation, apply a light grease to the solenoid plunger during commissioning to prevent freeze-up.
The CM-5040 suits integrators and facility teams deploying fail-secure perimeter control at a single-strike or small-cluster scale. Its 30VDC architecture is non-proprietary and standardized across most mid-market access control platforms, reducing lock-in risk and simplifying future upgrades. For deployments exceeding 10 strikes or requiring wireless/networked control, consider enterprise-grade electric strikes or integrated networked access points (which handle locking logic at the edge). For traditional relay-based systems serving 1–5 doors per controller, the CM-5040 delivers proven reliability and transparent troubleshooting — voltage test at the strike terminals answers 95% of field questions. See the Camden catalog for complementary push/pull strikes, matching power supplies, and wiring accessories.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've spec'd the CM-5040 into dozens of retrofit and new-build access control projects, and its maintained N/C logic is the feature that differentiates it from the majority of push/pull strikes on the market. The core operational advantage is fail-secure-by-design: if your controller loses power, communication, or relay supervision, the strike defaults to locked — there is no race condition where a power glitch coincides with a momentary unlock pulse and leaves the door ajar. In healthcare, data-center, and financial-services deployments, that's non-negotiable. The 30VDC signal is supplied continuously during unlock dwell; the strike holds open as long as voltage is present, then locks instantly when de-energized. This means your access control software must explicitly manage dwell timing — no automatic timeout at the hardware level. Integration is straightforward on systems with supervised relay outputs (ProWatch, VertX, Genetec), but integrators new to maintained strikes sometimes wire the 30VDC as a momentary pulse, expecting the strike to hold open mechanically. It won't: the solenoid needs sustained voltage. Get that detail right in the architecture phase, and the CM-5040 is trouble-free in the field.
Technical Highlights:
- 30VDC Solenoid Coil: Standard voltage across most mid-market controllers; eliminates proprietary power-module dependencies. Typical holding current draw is 0.8–1.2A, well within budget for a dedicated 30VDC relay line or secondary supply. Size your power distribution accordingly to avoid voltage sag under peak load.
- Maintained N/C (Normally Closed) Release: Unlike momentary strikes, the CM-5040 requires sustained 30VDC to unlock. The solenoid plunger retracts only while energized; de-energization causes mechanical re-engagement within one second. This is the fail-secure behavior: power loss equals instant lock-down, no solenoid-hold timeout.
- Push/Pull Mechanism (Bi-Directional): Accommodates both inbound and outbound swing without mechanical reconfiguration. Critical in retrofit scenarios where door swing direction may not be field-verified until rough-in stage. Saves stock-keeping complexity on the integration side.
- Red Anodized Housing: Provides tactile and visual field verification that you've installed the correct strike model (as opposed to a silver momentary strike). Reduces wiring errors in large multi-door deployments and helps maintenance crews identify the device on future service calls.
- Manufacturer Warranty Coverage: Factory-backed warranty (consult datasheet for duration) covers defects under normal operating conditions. No proprietary software licensing or per-unit annual fees; warranty claim is straightforward RMA process.
Deployment Considerations:
- Sustained 30VDC Requirement: The strike must remain energized for the entire unlock dwell period. If your access control panel can only deliver a momentary pulse (typical on legacy hardwired controllers), the CM-5040 will not work — you need a relay module or power-hold circuit to sustain voltage during unlock. Verify your controller capability before ordering.
- Voltage Drop on Long Cable Runs: Runs exceeding 50 feet should use 12 AWG or heavier cable to prevent voltage sag below the solenoid holding threshold (typically 27VDC minimum). In industrial facilities with heavy VFD loads or RF transmitters, use shielded twisted-pair and run conduit to ground at both ends to suppress EMI-induced nuisance releases.
- Dwell Timing is Software-Managed: The strike has no built-in timeout — you must configure dwell duration (unlock duration) in your access control panel software. Typical range is 2–5 seconds; if dwell expires while someone is still pulling the door, the strike locks under load. Coordinate with end-user expectations and ADA compliance requirements (some jurisdictions mandate 5+ seconds for accessible entries).
- Solenoid Plunger Inspection on Commissioning: Test mechanical re-lock by energizing and de-energizing the relay via software. Verify the plunger retracts fully when energized and re-engages within one second of de-energization. In cold or humid climates, light grease on the plunger bore prevents ice buildup or corrosion that could slow re-engagement.
- Door Closer Coordination: If the door has a surface-mounted closer, verify that the closer's spring force doesn't exceed the strike release mechanism's pullaway torque. A heavy closer may prevent the strike from releasing even when energized. Work with the door hardware installer to balance closer force and strike actuation spec.
The CM-5040 is the right choice for integrators and facilities deploying fail-secure controlled-egress doors (secure stairwells, server rooms, detention areas) where N/C maintained logic is non-negotiable. It's not the solution for high-throughput public-facing doors or badge readers that expect momentary pulse-driven unlocking — those require momentum-hold strikes or electric latch retraction hardware. For traditional relay-based access control serving 1–5 secured entries, the CM-5040 delivers proven reliability, transparent troubleshooting, and zero operational surprises. Explore the Camden catalog for complementary push/pull strikes, momentary variants, and integrated power-supply bundles.
