Camden CM-3220 Key Switch SPDT Momentary
Overview
The CM-3220 is a stainless steel key-activated switch designed for door strike control and access systems requiring momentary contact closure at 30VDC. It features single-pole double-throw (SPDT) configuration with both normally open (N/O) and normally closed (N/C) contacts — letting you activate a strike on key insertion and/or deactivate a competing circuit simultaneously. Flush-mount design fits standard 1", 1 1/8", or 1 1/4" mortise cylinders, making it a drop-in replacement for retrofit installations or new commercial door control builds.
Compatibility
The CM-3220 integrates into access control systems using 30VDC power supplies and momentary strike activation logic. It works with standard mortise cylinders (not included) and accepts one or two cylinders with up to four total switches in the CM-3200/3500 Series assembly. Compatible with any door strike, auxiliary relay, or solenoid lock that accepts momentary 30VDC contact closure. The color-coded 18 AWG soldered leads with heat-shrink sleeves connect directly to control logic or strike drivers — no special connectors or adapters required. Suitable for retrofit into existing systems where key-based authorization replaces or supplements card readers.
Installation Notes
The switch mounts flush in a double-gang stainless steel faceplate assembly. Heavy-duty construction with tamper-proof screws (driver included) and locators that prevent cylinder spinning — no set screws needed. UL/CSA approved. Suitable for indoor or outdoor environments. Left and/or right cylinder operation is available. Ensure 30VDC supply capacity matches your strike's holding/energize current; most commercial strikes draw 0.5–1.5A during momentary activation. Heat-shrink sleeves protect contact leads from moisture and corrosion — inspect before installation in high-humidity or salt-spray environments.
What's in the Box
- 1x CM-3220 key switch assembly (SPDT N/O & N/C momentary configuration)
- 1x Stainless steel double-gang faceplate
- 2x Brass cylinder lock rings
- 4x Socket/slotted screws
- 4x Tamper-proof screws with driver
