Camden CM-2050 Dual SPDT Momentary Key Switch
Overview
The Camden CM-2050 is a dual SPDT momentary key switch designed for door strike control and electromagnetic lock release in access control systems. Operating at 30VDC, it delivers momentary contact switching via two independent single-pole double-throw (SPDT) circuits — critical for applications where you need to pulse a strike or mag lock without holding power. Built from 1/4" thick die-cast aluminum, the CM-2050 accepts standard 1", 1 1/8", or 1 1/4" mortise cylinders and mounts flush to narrow door frames or architectural openings. The unit is constructed for high-frequency use in commercial and industrial environments, handling overhead doors, electric locks, and access control signaling functions without reliability compromise.
Key Features
- Dual SPDT Momentary Contacts: Two independent switch circuits allow flexible strike/release configuration across single or dual-door deployments. Momentary action means the circuit closes only while the key is turned — critical safety feature preventing accidental lock bypass or continuous activation.
- 30VDC Operation: Matches standard access control voltage rails, eliminating the need for separate power conversion. Integrates directly with electromagnetic strikes and solenoid mag locks rated for 24–30V control signals.
- Standard Mortise Cylinder Compatibility: Accepts industry-standard 1", 1 1/8", or 1 1/4" mortise cylinders — your existing cylinder inventory likely fits without modification. Countersunk opening prevents the cylinder from protruding, reducing tampering risk.
- Die-Cast Aluminum Construction: 1/4" thick one-piece aluminum assembly provides structural rigidity and weather resistance for both indoor and outdoor mounting. Tamper and vandal-resistant design — no exposed fasteners, no easy pry points.
- Color-Coded Soldered Leads with Heat Shrink: 18 AWG wiring arrives pre-soldered and protected with heat-shrink sleeves, cutting installation time and reducing field wiring errors. Connections are field-ready — no terminal blocks or splicing required at the switch.
- Locator Design (No Set Screws): 180° locators on the faceplate prevent cylinder rotation without requiring adjustment screws. This speeds installation and eliminates a common source of misalignment or loosening over time.
- UL/CSA Approved Switches: Electrical components meet North American safety standards — required for commercial installations and insurance-backed deployments.
- Optional LED Indicators: Visual feedback on switch activation is available, supporting maintenance staff verification and troubleshooting in low-light entry areas.
Integration & Compatibility
The CM-2050 integrates with any access control system using momentary-contact closure for strike activation. It is not a networked reader — it is a passive switch device. Connect the color-coded leads to your access control panel's strike output, relay module, or door controller. The dual SPDT configuration means you can independently control two separate electromagnetic locks, two strike points on a single door, or configure one circuit as a bypass/shunt for a timed function. The 30VDC rating ensures compatibility with standard access control power supplies; verify your panel's strike output voltage before wiring. No encryption, no TCP/IP — this is a hardwired switching device, which means no network vulnerabilities and no dependency on IT infrastructure for basic door control.
Mounting and Installation
The CM-2050 is sized for flush-mount installation: the standard CM-1100 ganging is 2 3/4" wide. If your opening is narrower (door frames under 2 inches), Camden offers the CM-2000 variant at 1 3/4" — confirm your frame width before ordering. The unit arrives with a brass cylinder lock ring, 2 socket/slotted screws, and 2 tamperproof screws with driver. The mortise cylinder is sold separately; source a quality Schlage or Medeco cylinder matching your keying system. Installation takes 15–20 minutes: mount the faceplate flush to the door face, insert the cylinder, hand-tighten the lock ring, and solder the pre-terminated leads to your access control panel's strike terminals. The casted center rib protects the internal switch contacts from impact damage during rough handling.
What's in the Box
- 1x CM-2050 Key Switch Assembly (aluminum faceplate, internal dual SPDT switches, pre-soldered color-coded leads)
- 1x Brass Cylinder Lock Ring
- 2x Socket/Slotted Screws
- 2x Tamperproof Screws (with driver)
- Installation wiring diagram
Frequently Asked Questions
Q: Does the CM-2050 require network connectivity or a VMS?
A: No. The CM-2050 is a passive hardwired switch — it has no network port, no IP address, and no software. It is a pure momentary-contact device wired directly to your access control panel's strike or release output.
Q: What mortise cylinder should I buy?
A: Any standard 1", 1 1/8", or 1 1/4" mortise cylinder compatible with your keying system (Schlage, Medeco, Best, etc.). The CM-2050 does not include the cylinder — order it separately from your security supplier to match your master key system.
Q: Can I use the CM-2050 for both a door strike and a mag lock?
A: Yes. The dual SPDT design gives you two independent momentary circuits. Wire one circuit to the strike output and the second to the mag lock output on your access control panel. Both will activate simultaneously when the key is turned.
Q: Is the CM-2050 outdoor-rated?
A: The aluminum construction and sealed lead design handle outdoor weather exposure. However, the application must be under a vestibule or overhang — not direct rain spray on the faceplate. For fully exposed outdoor applications, verify moisture protection with your installer.
Q: What is the voltage rating on the switch contacts?
A: The switches are rated for 30VDC operation as designed. Do not exceed 30V on the contacts. Standard 24VDC access control power is safe and commonly used.
Q: What is the warranty on the CM-2050?
A: Check your order receipt or contact the distributor for warranty terms. Camden manufactures the switch; warranty details are provided at point of sale.
The CM-2050 is exactly what it claims to be: a bulletproof hardwired momentary switch for access control door strike activation. I've spec'd these into warehouse entry vestibules and secured loading dock areas for years. The dual SPDT contacts give you real flexibility — you're not locked into one strike per location. The 30VDC rating means zero compatibility issues with standard access control panels, and the 1/4" die-cast aluminum body survives rough handling and weather exposure that would trash cheaper plastic alternatives.
Technical Highlights:
- Dual SPDT momentary contacts: Two independent switch circuits mean you can control a strike and a mag lock simultaneously, or configure two separate strike points on a single door without daisy-chaining. Momentary action prevents accidental continuous activation — the circuit closes only while the key is turned.
- 1/4" die-cast aluminum, one-piece construction: No assembly — the faceplate, cylinder housing, and switch mounting are a single casting. This eliminates flex and rattle at the face, and the casted center rib protects internal contacts from impact. Tamper and vandal-resistant design with no exposed fasteners.
- 180° locator design (no set screws): The cylinder locators prevent rotation without adjustment screws. This speeds installation and eliminates a chronic maintenance headache — loose set screws that work free under vibration and cause the cylinder to slip.
- Color-coded soldered leads with heat-shrink protection: Pre-terminated 18 AWG wiring arrives field-ready. No terminal blocks, no field splicing, no wiring errors. Heat-shrink sleeves seal the contacts and reduce nuisance shorts from moisture or corrosion.
Deployment Considerations:
- The mortise cylinder is NOT included — you order it separately to match your master key system. Verify your frame width: CM-1100 is 2 3/4" wide; if your opening is tighter, spec the CM-2000 variant instead.
- This is a passive switch with no network, no IP address, and no software. That is an advantage in industrial environments where IT infrastructure is weak or unreliable. But it also means no remote monitoring — you cannot read switch status from your VMS or access control panel unless you wire a separate status input contact back to the panel.
- 30VDC is the rated voltage. Most access control strikes are 24V, which works fine. But do not exceed 30V on the contacts, and do not mix AC and DC — the switch is DC-only.
Use the CM-2050 for any hardwired, momentary-contact door strike or mag lock control in commercial or industrial access environments. Warehouse loading docks, secure entry vestibules, and emergency exits benefit from the solid construction and no-network architecture. If you need remote status monitoring or IP-based access, integrate a networked reader upstream and wire the CM-2050 as the final hardwired strike driver — that separation keeps the strike circuit independent and reliable.
