Camden CM-1110 Key Switch SPST Maintained
The Camden CM-1110 is a single-pole, single-throw (SPST) maintained key switch designed for 30VDC access control circuits requiring manual key-based activation without networked credential dependency. Built into a one-piece die-cast aluminum housing, the CM-1110 provides latching contact closure as long as the key remains in the on position — making it ideal for emergency door strike override, electromagnetic lock manual bypass, or situations where authorized personnel need direct physical control independent of system integration failures.
Key Features
- SPST Maintained Contact: Holds activation signal until key is manually rotated back to off. No auto-reset—operator control remains explicit and verifiable.
- 30VDC Rated: Standard voltage for most access control strike circuits and electromagnetic locks. Compatible with any 30VDC power supply and relay-based door control systems.
- Die-Cast Aluminum Housing: 1/4" thick aluminum body rated for all-weather exterior mounting. Corrosion-resistant and tamper/vandal resistant for high-traffic commercial and industrial deployments.
- Mortise Cylinder Mount: Flush mounting into standard 1", 1 1/8", or 1 1/4" mortise cylinder openings. Installs directly into most commercial door frames without surface mounting hardware.
- No Network Requirement: Operates as a pure mechanical switch with electrical output—no IP connectivity, no configuration, no dependency on control system uptime or credential database.
- Tamperproof Hardware: Supplied with two tamperproof screws and driver to prevent unauthorized disassembly in unsecured environments.
The CM-1110 integrates seamlessly with any 30VDC access control system, electric strike, or electromagnetic lock circuit that accepts simple contact closure. The maintained contact design means the switch remains energized throughout the hold period—ideal for manual door release scenarios where the operator must stay at the control point. Unlike momentary switches, there is no timing-dependent release; the door stays unlocked as long as the key is turned.
Installation requires minimal electrical work: run 30VDC power and ground to the switch terminals, then wire the normally-open contact to the strike or lock control circuit. The brass cylinder lock ring, mounting screws, and tamperproof fasteners are included. The 1/4" aluminum construction withstands weather exposure, physical abuse, and environmental stress common to exterior entry points, loading docks, and industrial perimeter doors.
This key switch is often paired with electric strikes or mag locks as a manual fail-safe override in buildings where power loss or system malfunction must not trap occupants. Because it operates independently of the access control network, it provides an always-available physical escape route — a critical requirement in life-safety code applications. It's also used in industrial settings where machinery interlocks or equipment shutdown need manual authorization by a keyholder, regardless of supervisory system status.
The CM-1110 carries Manufacturer Warranty. It is not networked and requires no VMS integration or management platform compatibility—it's a standalone electromechanical device. For deployments requiring remote logging of key-switch activation, pair it with an access control panel that can monitor the contact closure and report the event to a central management system.
Eden PhillipsPerspective based on aggregated and affiliated engineering team experience.
We've installed the CM-1110 in dozens of access control retrofits where building code requires a manual override that does not depend on the security system's operational state. What sets this switch apart is its simplicity and independence—there's no network to fail, no credential database to corrupt, no firmware to patch. It's pure mechanical switching with 30VDC control. In life-safety applications (stairwell doors, emergency exits), that means you're meeting code requirements without adding network-dependent infrastructure. We've seen it used most often as a final-release switch on mag-locked emergency exits, keyed by building management or security staff, and monitored by the access control panel through a simple door-strike status input. The maintained contact behavior is critical: a momentary switch would require the operator to hold a button continuously; the maintained design lets them turn the key and walk away, with the lock remaining active until someone rotates the key back.
Technical Highlights:
- 30VDC 1/4" Die-Cast Aluminum: Standard voltage in access control circuits means minimal wiring changes in retrofit work. The 1/4" aluminum body, combined with corrosion-resistant brass fittings, survives exterior salt spray and wash-down environments without degradation or replacement.
- Maintained vs. Momentary Contact Design: A held contact is operationally safer in manual override scenarios—the operator doesn't have to maintain button pressure, reducing fatigue and the chance of accidental release during an emergency evacuation.
- Mortise Cylinder Integration: Flush mounting into standard mortise openings means no surface-mounted lever hardware to catch on clothing or equipment. Clean, recessed appearance and no protrusions in high-traffic zones.
- No Network Dependency: This is the differentiator. When your access control system is down, this switch still functions. We've used it as a deliberate break-glass control in sites where network redundancy was not available or cost-prohibitive.
- Tamperproof Assembly: The included tamperproof screws and driver prevent casual disassembly in unsecured locations. Not a high-security lock, but sufficient deterrent for most commercial and light industrial settings.
Deployment Considerations:
- The 30VDC circuit must be well-regulated and protected with circuit breakers. Voltage spikes or inadequate power conditioning can damage the contacts over time. Always verify your power supply can deliver clean 30VDC before field installation.
- Mortise cylinder depth varies by door frame and frame material. Confirm your frame can accommodate a 1", 1 1/8", or 1 1/4" mortise opening before ordering. No universal adapter is available—the switch is sized for standard commercial mortise locks.
- Maintained contact circuits require a load (strike or lock) that can safely hold energized indefinitely. If your circuit is designed for momentary pulses only, the switch may overheat the coil. Verify strike/lock duty rating with the hardware manufacturer.
- Key security is operator responsibility—no audit trail of who held the key or when. Pair this switch with a panel input that logs the activation event if logging is required for compliance or post-incident investigation.
- Installation in wet or corrosive environments (coastal facilities, food-processing plants) requires regular inspection of the brass cylinder ring and screw heads. Schedule annual maintenance to prevent seizing from salt or mineral buildup.
The CM-1110 is ideal for building managers, integrators, and security teams who need a fail-safe manual override that does not depend on system uptime, network connectivity, or credential infrastructure. If your deployment requires a key-based, always-available emergency release that survives power loss and system failures, this is the right choice. Explore the full Camden catalog for complementary strike hardware and control solutions.
