Camden CM-3200 SPST Momentary Key Switch
The Camden CM-3200 is a flush-mount stainless steel key switch engineered for hardwired access control circuits requiring mechanical key credential and momentary contact actuation. Operating at 30VDC, it delivers a normally-open (N/O) contact pulse to trigger door strikes, electric locks, solenoid relays, or auxiliary control functions. Install it in standard 1", 1 1/8", or 1 1/4" mortise cylinders within a double-gang electrical box or wall-mounted assembly. The combination of stainless steel faceplate, brass cylinder lock rings, and tamper-resistant mounting hardware makes this switch suitable for both indoor climate-controlled spaces and outdoor or semi-exposed installations where key-based manual actuation is the preferred control method.
Key Features
- Momentary N/O Contact Closure: 30VDC dry-contact output. Sends a pulse signal to any access control device, door strike module, or relay-based controller without protocol dependency.
- Mechanical Key Credential: Accepts one or two mortise cylinders (sold separately). Key-based authentication eliminates card/credential loss risk in low-traffic or emergency egress scenarios.
- Stainless Steel Faceplate: Withstands outdoor exposure, high-traffic handling, and corrosive salt environments without rust or cosmetic degradation. Double-gang mounting format.
- Tamper & Vandal Resistant: Brass cylinder lock rings, tamper-proof mounting screws with driver included, and cylinder locators prevent spinning or removal without tools. Suitable for public-access or high-security perimeter doors.
- Hardwired Integration: No network dependency, no protocol overhead. 18 AWG soldered leads with heat-shrink sleeves terminate directly into your controller's momentary input or strike circuit. Legacy and modern 30VDC systems compatible.
- Compact Double-Gang Form Factor: Fits standard electrical boxes; supports up to four switches in a single assembly depending on cylinder configuration. Flexible layout for multi-point egress or redundant actuation circuits.
- Field-Serviceable Hardware: Socket and slotted screws (standard) plus tamper-proof screws with driver (security option) allow integration teams to configure mounting to site requirements without special tools.
Hardwired Access Control Integration
The CM-3200 is a pure dry-contact switch — no electronics, no firmware, no dependencies on network availability. Wire the 18 AWG soldered leads directly into your door controller's momentary or pulse input, or into a strike relay module. Systems like 4-wire door strikes, electric deadbolts, magnetic locks, and solenoid gates all respond to the N/O contact closure. The 30VDC operating voltage is standard for access control hardware; verify your controller supplies this voltage at the momentary terminal before specifying. Because there is no protocol stack, the CM-3200 works equally well in legacy hardwired panels from the 1990s and contemporary networked systems that include a hardwired interface for manual overrides or mechanical failsafe actuation.
Deployment contexts include: emergency egress doors where key-based override prevents reliance on battery-backed electronics during power loss; utility or mechanical rooms requiring authorized personnel to unlock multiple strike points via a single key; outdoor gates or bollards where weatherproof credential management is critical; and retrofit installations into existing hardwired systems where card readers or proximity readers cannot be integrated without major rewiring. The key-based authentication model also satisfies audit and compliance scenarios where a physical key is logged or managed as the credential of record.
Environmental & Mechanical Durability
Stainless steel faceplate and brass hardware withstand outdoor salt spray, humidity, and UV exposure without corrosion or discoloration. The double-gang mounting is recessed flush into the wall or box, minimizing the profile for bumping or accidental actuation. Cylinder lock rings and tamper-proof fasteners discourage casual removal. Heat-shrink sleeves on soldered leads protect connections from moisture ingress; if installed in high-humidity or wet environments (outdoor porticos, loading docks), plan additional conduit or weatherproof junction boxes downstream of the switch termination.
The mortise cylinder itself is not included with the CM-3200 — you supply a standard 1", 1 1/8", or 1 1/4" mortise cylinder (keyed to your site standard) and install it into the switch assembly. This modularity allows fleet standardization: all CM-3200 units accept the same keyed cylinders, reducing inventory and simplifying rekeying or master-key changes across multiple access points.
Specifications & Compliance
Operating voltage: 30VDC. Contact type: SPST momentary N/O. Lead gauge: 18 AWG with soldered tinned ends and heat-shrink sleeves. Faceplate: stainless steel, double-gang format. Hardware: brass cylinder lock rings, stainless steel socket screws, tamper-proof screws with driver. Mount options: flush wall mount, pole mount, or rack integration via standard electrical boxes. The CM-3200 carries Manufacturer Warranty coverage and integrates with any access control system accepting hardwired 30VDC momentary contact inputs — no firmware updates, no compatibility matrix to check.
Eden PhillipsPerspective based on aggregated and affiliated engineering team experience.
We've installed the CM-3200 in a wide variety of hardwired access scenarios — from utility closets to perimeter egress gates — and it remains one of the most reliable, no-nonsense switches in the low-voltage access control toolkit. The key advantage is simplicity: there's no protocol to fail, no battery to drain, no configuration menu. Turn the key, the switch closes, the door unlocks. In environments where network infrastructure is unstable or where security policy demands a mechanical, key-based failsafe, the CM-3200 is the right choice. The stainless steel construction and brass hardware hold up well in outdoor and corrosive environments; we've seen units in salt-spray coastal applications and carwashes that have outlasted the door frames they were mounted in. The real-world trade-off is credential management: keys are easier to lose, harder to audit in real time, and require rekeying or master-key changes when personnel turn over. For high-traffic public facilities (airports, hospitals, multi-tenant buildings), a proximity reader or keypad is often a better fit. But for low-volume controlled access or emergency override points, the CM-3200 delivers bulletproof reliability at minimal cost.
Technical Highlights:
- Momentary N/O Dry Contact at 30VDC: The simplest possible interface — no active electronics means no failure modes related to power supply ripple, logic errors, or firmware bugs. The contact closure is instantaneous and repeatable. Any door controller accepting a momentary input will work; no protocol handshake, no compatibility matrix required.
- Stainless Steel & Brass Construction: Faceplate and hardware resist outdoor corrosion and salt spray. We've deployed these in coastal marinas, carwashes, and outdoor loading docks without visible rust or functional degradation after 5+ years. Paint and plating hold better than aluminum or zinc alternatives.
- Mortise Cylinder Modularity: The cylinder is not included, which is actually an advantage — you install a keyed mortise cylinder matching your site's master-key system. Simplifies fleet standardization: all CM-3200 units accept the same key inventory. Rekeying doesn't require replacing the switch, only the cylinder.
- Tamper-Proof Fastener Set: Includes both standard socket screws and tamper-proof (spanner head) screws with driver. Allows you to choose security posture on a per-installation basis — standard hardware for standard risk sites, tamper-proof for high-theft or public-access areas.
- 18 AWG Soldered Leads with Heat-Shrink: Tinned soldered terminations are reliable and easy to splice into terminal blocks or junction boxes. Heat-shrink sleeves protect from moisture. Lead length is approximately 18" — sufficient for most in-wall routing, but verify run distance to your strike module before ordering.
Deployment Considerations:
- Mortise Cylinder Supply Chain: The cylinder is not included. Source a standard 1", 1 1/8", or 1 1/4" mortise cylinder keyed to your site specification. Verify keying and master-key compatibility before installation — a cylinder ordered to the wrong profile will require rework.
- 30VDC Supply Requirement: The switch operates at 30VDC, not 12VDC or 24VDC. Confirm your door controller or strike module supplies this voltage. Many modern access controllers output 24VDC; you may need a dedicated power supply or voltage booster if your system is 24V-native.
- Lead Length & Routing: ~18" of soldered lead limits how far the switch can sit from your strike controller. In large electrical boxes or outdoor pedestal mounts, plan additional conduit or junction boxes to bridge the distance without stressing the solder joints.
- Outdoor Moisture Protection: Stainless steel resists corrosion, but soldered lead terminations can absorb moisture in high-humidity outdoor environments. Seal the junction box or use a weatherproof enclosure downstream of the switch to keep water out of terminal blocks.
- Key Loss & Rekeying Cost: Keys can be lost or stolen. Unlike a keypad code or proximity card, you cannot remotely disable a lost physical key. Plan for periodic rekeying or master-key rotation. For high-turnover facilities, track key distribution carefully.
The CM-3200 is the right fit for integrators specifying reliable, maintenance-free manual access actuation in hardwired systems — particularly in retrofit or emergency-override scenarios where network dependency is not acceptable. Explore the Camden catalog for complementary strike hardware and control panels.
