Camden CM-1220 Key Switch SPDT Momentary
Overview
The CM-1220 is a momentary SPDT (Single-Pole Double-Throw) key switch with both normally open (N/O) and normally closed (N/C) contacts, rated for 30VDC operation. Built in stainless steel with a heavy-duty one-piece cast assembly, it integrates into electric strike and electromagnetic lock circuits where authorized personnel need push-to-activate control. The switch accepts standard 1", 1 1/8", or 1 1/4" mortise cylinders and is engineered for high-frequency use in commercial door control, shunt/bypass applications, and access management circuits.
Compatibility
The CM-1220 works with electric strikes, electromagnetic locks, electric door openers, and overhead door operators rated for 30VDC switching. It pairs with standard mortise cylinders available separately from Camden Door Controls and is suitable for integration into access control systems where momentary contact activation (not sustained hold) is required. The dual-output SPDT configuration allows it to simultaneously control one load via the N/O contact while signaling or shutting down an alternate function via the N/C output—typical in installations that activate a strike while deactivating a solenoid bypass or monitoring circuit.
Installation Notes
The switch is supplied as a single-gang flush-mount unit (2 3/4" width) with a countersunk cylinder opening in the cast body. Package includes a brass cylinder lock ring, 2 socket/slotted screws for the cylinder, and 2 tamperproof screws with driver. Mounting into standard door frames or narrow vertical spaces is straightforward; the one-piece casting and tamper-resistant design make it suitable for all-weather and vandal-prone environments. Wire the N/O and N/C contacts into your strike or lock circuit at 30VDC—ensure your power source can handle the inrush current of the load (solenoid strike or electromagnetic lock) on key activation.
