Camden CM-2000 Key Switch SPST Momentary N/O
The Camden CM-2000 is a flush-mount key switch designed for 30VDC door strike activation and access control signaling. Cast from 1/4" aluminum in a single die-cast body, the CM-2000 delivers momentary normally-open (N/O) contact closure rated for high-frequency use in commercial and industrial access control installations. At 1.75" width, it fits retrofit applications where the wider CM-1100 (2.75") cannot; the compact footprint eliminates rework to door frames during replacement cycles. Built for electromagnetic locks, electric strikes, timed bypass functions, and authorized personnel manual override — the SPST architecture requires no relay logic or intermediate signaling.
Key Features
- 30VDC Momentary N/O Contact: SPST switch rated for 30VDC operation. Direct wiring to door strike or electromagnetic lock coil; no separate relay required.
- 1.75" Flush-Mount Profile: Significantly narrower than CM-1100 (2.75"). Fits tight door jamb installations and retrofit replacements without frame modification.
- 1/4" Die-Cast Aluminum Body: Single-piece casting resists vandalism, corrosion, and all-weather exposure. Countersunk mortise cylinder opening accommodates standard 1", 1 1/8", or 1 1/4" cylinders.
- Mortise Cylinder Credential: Accepts universally sourced mortise locks (not included). Brass lock ring and tamper-proof mounting hardware supplied.
- Institutional/Industrial Grade: Deployed in commercial buildings, facilities requiring authorized egress override, and high-traffic access control where manual key-operated release is mandated or required for emergency bypass.
- Field-Serviceable: Two simple switch terminals for N/O wiring. Installation is flush into door frame or jamb; typical integration runs 30VDC supply → switch → strike/lock solenoid.
The CM-2000 is optimized for retrofit installations in facilities where door-frame geometry or space constraints prevent use of larger key-switch profiles. The momentary contact closure is ideal for timed electric strikes, magnetic locks with solenoid release, and access control systems requiring a key-actuated manual override. Because it delivers a direct momentary pulse rather than sustained contact, it pairs naturally with door controllers and access panels that expect a momentary input trigger.
Installation involves flush-mounting into the door frame or jamb; the package includes socket and slotted mounting screws, tamper-proof fasteners with driver, and the brass cylinder lock ring. The 30VDC rating keeps it compatible with standard access control power supplies — no special 24VAC-to-DC conversion required. Wiring terminals are conventional and require no programming; field integration is straightforward for integrators familiar with electrified hardware.
Typical deployments span institutional facilities (universities, hospitals, government buildings), commercial office and retail secure areas, and industrial manufacturing plants where authorized personnel need manual egress override independent of networked access control. The mortise cylinder requirement (sourced separately) means the credential hardware can be keyed to match existing door and lock cylinders on the facility, reducing key management complexity.
The CM-2000 carries manufacturer warranty and is built to withstand high-cycle use in 24/7 access control environments. Integrators should verify 30VDC supply availability at the installation point and confirm strike or lock solenoid voltage rating before ordering. Datasheet and wiring diagrams are available to confirm compatibility with specific door controllers and access panels.
Eden PhillipsPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the CM-2000 across retrofit and new-build projects where door-frame geometry or design aesthetics demand a narrow key-switch profile. The 1.75" width is the real differentiator — on retrofit work where the door frame is already hung and the wider CM-1100 would require structural rework or strike-plate relocation, the CM-2000 slides in without modification. On new construction, it's the go-to when architects spec a tight aesthetic and the integrator doesn't have the luxury of wider jamb space. The momentary N/O contact is clean — one input trigger to the access controller and the strike or lock releases for the programmed duration (typically 500–800ms). We've paired it with Salto, Honeywell, and Allegion platforms without issue; the simple two-terminal wiring architecture means zero firmware or configuration overhead. The trade-off is obvious: you're sourcing the mortise cylinder separately, which adds a SKU and a coordination step with the locksmith. On large multi-door deployments (20+ CM-2000 units), we've seen projects bundle mortise cylinder sourcing through the main lock supplier to reduce lead times and key-management headaches.
Technical Highlights:
- SPST Momentary N/O Architecture: Direct pulse trigger to electromagnetic lock or electric strike solenoid coil. No relay logic, no sustained contact noise, minimal wiring footprint. Ideal for timed-release integration on access controllers that natively expect momentary input.
- 30VDC Rating: Aligns with standard access control power supplies and door-controller outputs. On retrofit work, verify the existing 30VDC bus capacity; a single CM-2000 draw is minimal, but bundling 8+ strikes on one supply can exceed capacity on undersized power units.
- Die-Cast Aluminum vs. Painted Steel: The 1/4" aluminum casting shrugs off corrosion and physical vandalism better than painted steel. In humid or coastal environments, the long-term maintenance story is cleaner; no rust-out risk on the housing itself. Cost per unit is slightly higher, but lifecycle math favors aluminum on multi-year deployments.
- Mortise Cylinder Flexibility: Standard 1", 1 1/8", or 1 1/4" mortise cylinders fit. You can key them to match existing facility cylinders, reducing keyring bloat and training overhead. Downside: the cylinder sourcing step adds lead time if the integrator is not bundled with the door/lock procurement.
- Flush-Mount Installation: Requires clean jamb access and drill-out for the mortise pocket. On retrofit work where the door is hung and the frame is tight, confirm the rough opening accommodates the 1.75" width before ordering; a door stop or trim molding occasionally needs relocation.
Deployment Considerations:
- Mortise Cylinder Sourcing Overhead: The CM-2000 does not ship with a mortise cylinder. Coordinate cylinder sourcing with the door hardware supplier or a local locksmith. On large deployments, bundle the mortise cylinder procurement through the main lock supplier (Allegion, Salto, etc.) to consolidate lead times and avoid shipping delays.
- 30VDC Supply Capacity Verification: Before wiring multiple CM-2000 units, confirm the access control power supply or door controller output can deliver the aggregate current. Solenoid inrush current is brief (typically 200–500ms), but steady-state coil draw on an electromagnetic lock can approach 1A per strike. A 24VDC/5A supply can handle 4–5 simultaneous strikes; don't oversubscribe without a dedicated power feed.
- Momentary vs. Sustained Wiring Context: Confirm the access controller output is configured for momentary-pulse operation (typically 500–800ms dwell). If the panel expects sustained contact closure, the strike will stay energized indefinitely, creating a security vulnerability and potential solenoid overheating. Review the panel logic before commissioning.
- Frame Preparation and Mortise Pocket: The countersunk mortise opening is standard, but door-frame material (wood vs. metal) affects drilling difficulty. On metal-frame doors, pilot-hole centering is critical to avoid cracking the aluminum housing. Request or provide detailed installation drawings to the installer before the job commences.
- Cylinder Key Management: Mortise cylinders can be keyed differently from the main entry lock on the same door. On multi-door facilities, establish a key matrix early: is the CM-2000 cylinder keyed to a master key? Restricted key? Same as the main lock? Locksmith coordination prevents on-site rework and improves handoff to facilities management.
The CM-2000 is the right choice for retrofit and tight-space access control installations requiring a key-operated manual override. Integrators managing institutional or commercial multi-door deployments will benefit from bundling mortise cylinder sourcing with the main lock supplier. For deeper guidance on 30VDC supply sizing and momentary-contact controller configuration, review the technical datasheet and consult the Camden catalog.
