Camden CM-1000/45 SPDT Maintained Contact Switch
The Camden CM-1000/45 is an SPDT (single pole, double throw) maintained contact switch engineered for access control systems, electromagnetic strikes, and auxiliary electromechanical loads. Rated 6A @ 125V AC and 3A @ 30VDC, this switch provides stable, reliable contact closure in both continuous and intermittent duty cycles — the maintained contact topology ensures contacts remain in the last commanded state without continuous coil power. TCP/IP network integration allows the switch to operate as an intelligent node within modern access control platforms, enabling remote status monitoring and control without dedicated hardwired supervision lines.
Key Features
- SPDT Configuration: Single pole, double throw contact arrangement. Allows simultaneous control of two independent circuits (e.g., strike + auxiliary alarm notification) from a single control signal.
- Maintained Contact Design: Contacts hold their last commanded state without continuous power draw. Eliminates coil heating in idle state and simplifies door-unlock sequencing logic in access control workflows.
- Dual Voltage Rating: 6A @ 125V AC; 3A @ 30VDC. Covers both legacy 24VDC strike systems and standard 120VAC auxiliary circuits (solenoid locks, alarm relays, indicator lights).
- TCP/IP Communication: Network-addressable endpoint. Integrates directly with access control panels and building management systems; eliminates need for hardwired relay racks in remote door locations.
- Wall and Pole Mount Options: Flexible installation geometry. Wall mounting suits recessed electrical boxes; pole mounting accommodates remote access points (exterior vestibules, parking-structure gates) where conduit runs are impractical.
- Manufacturer Warranty: Factory-backed warranty coverage. Sourced direct from the manufacturer or US channel partner — no grey-market, no parallel imports.
The SPDT contact topology differentiates the CM-1000/45 from simple relay modules. In a typical access control deployment, one pole activates a magnetic strike while the second pole triggers an auxiliary notification — a door sensor latch alarm, a buzzer, or a badge-reader feedback circuit. Because the switch is maintained (contacts latch), the control panel can drop the activation signal and the contacts remain in the energized state until an explicit de-energize command is sent. This reduces polling overhead in networked panels and simplifies timer-based door-unlock sequences.
TCP/IP integration eliminates the cost and installation labor of hardwired relay panels at satellite doors. In a multi-tenant office or university campus, a single access control server can supervise dozens of CM-1000/45 nodes across different buildings using standard Ethernet cabling and PoE power injection (where applicable). Status feedback — strike activation, contact closure confirmation, fault detection — flows back over the network in real time, enabling dashboard alerts and audit logging without additional hardwired feedback loops.
The dual voltage rating (6A @ 125V AC; 3A @ 30VDC) bridges legacy and contemporary access control architectures. Older magnetic strikes often operate at 24VDC with 3A nominal draw; the CM-1000/45 handles that load directly. Newer fail-safe solenoid locks may use 120VAC at higher amperage; the 6A @ 125V AC rating provides headroom. Field verification of load current and voltage is essential before installation — confirm strike or solenoid specifications against the switch rating to avoid nuisance dropout or contact erosion from over-current.
The Camden CM-1000/45 is suited for integrators deploying medium-scale access control systems where networked relay distribution simplifies electrical infrastructure and operational support. Consult the product datasheet for detailed electrical specifications, contact material composition, and environmental operating limits.
Eden PhillipsPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've specified the Camden CM-1000/45 across a range of campus and commercial deployments, and it occupies a practical middle ground between hardwired relay cabinets and modern IP strike controllers. The maintained contact design is the workhorse feature — it decouples the access control panel's activation pulse from the strike solenoid's energization duration, which simplifies door-unlock logic and reduces firmware complexity on the controller. In practice, that means fewer firmware revisions chasing race conditions in door-open sequences, and fewer field technician callbacks for timing-dependent lock cycling failures. The TCP/IP network interface is straightforward ONVIF-adjacent (not full ONVIF, but REST/modbus-over-TCP variants are common), and integrates cleanly into building management systems like Genetec Security Center or Milestone Husky VMS platforms via native relay modules or third-party gateway plugins. Against pure IP strike controllers (Salto, Abloy, Assa Abloy IP locks), the CM-1000/45 is lower capex — you're adding network smarts to existing electromechanical hardware instead of replacing the entire lock ecosystem. Against hardwired relay racks, you save conduit, labor, and panel real estate. The trade-off is that you're limited to the contact rating (6A @ 125V AC), so dual-solenoid fail-safe / fail-open scenarios or high-inrush loads (some older striking hardware draws 8-10A on closing) require careful specification. We've also encountered legacy sites where the TCP/IP backchannel is unreliable (WiFi dropout, network congestion, firewall rules conflicts) — in those cases, the switch defaults to the last commanded state, which is correct failsafe behavior, but it means your access logs go dark until network recovery. Plan for that operationally.
Technical Highlights:
- SPDT Maintained Contacts: Two independent contact circuits remain latched in the last commanded state without continuous coil power. Operational consequence: the access control panel sends a brief pulse to toggle the strike, then cancels the command signal — no sustained relay chatter, no coil heating, and cleaner current profiles on the power distribution. Saves ~500 mW per door on continuous duty compared to momentary-contact designs.
- Dual Voltage / Current Rating: 6A @ 125V AC or 3A @ 30VDC. Handles both 24VDC magnetic strikes (older installations) and 120VAC solenoid locks (newer hardware) from a single device. Reduces SKU complexity and field logistics — one switch covers legacy and modern deployments.
- TCP/IP Networked Control: Remote activation and status feedback over standard Ethernet. Eliminates hardwired relay cabinets at satellite doors; status data (strike energized, contact confirmed closed, fault detection) flows back to the access control server in real time for dashboard alerts and audit trails.
- Wall and Pole Mount Flexibility: Accommodates both recessed electrical box installation (interior doors, office suites) and exposed pole mounting (exterior access points, parking gates). Reduces site-specific engineering variation and enables standardized procurement across diverse building types.
Deployment Considerations:
- Verify strike and solenoid load current before commissioning. The 6A @ 125V AC and 3A @ 30VDC ratings are ceilings — contact erosion and dropout risk increase if in-rush current exceeds 7A or sustained draw exceeds rated amperage. Measure actual strike current with a clamp meter during closing; if it exceeds 80% of the switch rating, specify a higher-capacity relay or a separate strike controller.
- Network reliability is critical. If the TCP/IP link drops, the switch maintains the last commanded state (correct failsafe), but status feedback stops. On sites with unreliable WiFi or congested Ethernet, plan for manual supervision and local bypass procedures. Hardwired status-feedback lines (dry-contact output from the switch) are a failover option if the access control platform supports them.
- Integration with legacy access control panels may require gateway modules or custom relay mappings. Confirm the panel's relay output protocol (voltage, pulse duration, control voltage) matches the CM-1000/45's input specification. Some older panels use low-current signaling (12VDC logic) — that works, but confirm the input sensitivity before installation.
- Environmental exposure: if the switch is mounted outdoors or in damp environments (vestibules, parking structures), specify a NEMA 4X or weatherproof enclosure. The switch itself is rated for standard indoor conditions; prolonged moisture exposure will accelerate contact oxidation and increase dropout risk.
- Document the strike voltage and current in the commissioning paperwork. Future technicians (or yourself, two years later) will need to know whether a given switch is controlling a 24VDC or 120VAC strike. Label the switch and include the specification in the as-built access control schematic.
The CM-1000/45 is the right choice for integrators building networked, multi-tenant, or distributed access control systems where cost efficiency and operational simplicity matter more than cutting-edge smart-lock aesthetics. If your deployment includes legacy magnetic strikes, campus-scale door counts, or budget constraints, this switch delivers. For more options and specifications across the Camden product line, visit the Camden catalog.
