Camden CM-4000/51N N/C Switch Block and Contact
Overview
The CM-4000/51N is a normally-closed switch block and contact assembly for integration with access control systems in the Camden CM-3000–8000 series. This component handles electrical switching between the controller and door strike or lock, rated at 30VDC — the standard supply voltage for electric locks and magnetic strikes. Deploy this where you need reliable contact switching without active power management of the switch itself; the N/C (normally-closed) configuration means the switch sits closed until the controller energizes the unlock command. Typical installations: standard office entry, secure storage rooms, or any door retrofit where a Camden controller already manages credential reading and strike firing.
Compatibility
The CM-4000/51N is designed specifically for Camden CM-3000, CM-4000, CM-5000, CM-7000, and CM-8000 series access control panels. It integrates with controllers that support DESFire, MIFARE, HID, SEOS, and 125kHz proximity credentials through compatible smart card reader modules. The assembly operates via TCP/IP network communication when deployed in networked controller setups. Confirm your existing controller model number matches the CM-3000–8000 range before ordering; this component is not compatible with other access control manufacturers' platforms.
Installation Notes
Mount the switch block directly to the controller's internal terminal block or external wiring interface, following the controller's terminal diagram. The 30VDC rating means it pairs directly with standard electric strike power supplies — no step-down transformer required. Wire the N/C contacts in series with your strike so that loss of power (or loss of the controller) defaults the door to locked. Test the contact closure under load (with the strike energized) before final commissioning to confirm no arcing or contact bounce under your specific current draw.
