Camden CM-2520/48 Combo Switch Lock/Strike

Camden CM-2520/48 Combo Switch Lock/Strike

The Camden CM-2520/48 is a double-gang push plate switch and integrated strike control designed for ADA-compliant door activation in high-traffic commercial and institutional environments. The 4.5" x 4.5" stainless steel faceplate (US32/C32D satin finish) mounts directly to a standard double-gang electrical box and provides momentary contact closure to trigger electric strikes, electromagnetic locks, and automatic door operators across 12/24V AC/DC circuits. Rated 3A @ 30V DC with N/O SPST relay logic, the CM-2520/48 eliminates the need for external relays in standard strike release applications — a significant labor and cost savings on retrofit access control upgrades. Silent activation, high tactile feedback, and 1 5/16" shallow mounting depth suit hospitals, senior residences, retail corridors, government buildings, and any facility where wheelchair-accessible, fail-safe door control must integrate seamlessly into the existing wall frame.

Key Features

• Double-Gang Form Factor: 4.5" x 4.5" stainless steel US32/C32D faceplate. Mounts to standard double-gang electrical boxes — simplifies retrofit retrofits without frame modification or surface-mounted brackets.
• 12/24V AC/DC Universal Voltage: Works with both AC and DC power sources. Flexible integration with legacy building systems and modern hardwired access control panels.
• 3A @ 30V DC Contact Rating: Sufficient for direct strike activation without additional relays on most 12V and 24V electromagnet locks and strikes. Reduces wiring complexity and eliminates interposing relay cost on standard door control circuits.
• Momentary N/O SPST Contact: Standard normally-open, single-pole single-throw relay closure. Compatible with all modern and legacy access control strike controllers, BACnet building automation, and proprietary door release systems.
• Silent Momentary Operation: Tactile push-plate activation produces no audible relay click. Ideal for quiet zones (hospitals, libraries, senior care) where noise from mechanical relays would be disruptive.
• Operating Temperature Range -40°F to +140°F (-40°C to 60°C): Rated for heated indoor spaces and non-freezing vestibules. Outdoor mounting not recommended without supplementary weatherproofing enclosure.
• Shallow 1 5/16" (33mm) Depth: Minimal projection behind door frame. Fits tight retrofit installations where frame depth is limited; reduces risk of strike assembly protrusion into adjacent cavities.
• Stainless Steel Construction: US32/C32D satin finish resists fingerprints and corrosion in high-touch environments. Durable in hospitals, laboratories, and food-service corridors.

The CM-2520/48 integrates access control and door hardware into a single electrical point of presence. Rather than mounting a separate push-button switch box and a separate strike release relay, the combo unit consolidates both functions — reducing panel space, conduit runs, and installation labor on large multi-door projects. On a 20-door retrofit, that consolidation translates to 20 fewer relay enclosures, 40 fewer conduit entries, and measurable reduction in electrical room footprint and wiring time.

Installation requires a standard double-gang electrical box, 18/2 or 16/2 twisted-pair cable from the access control panel, and basic electrical knowledge. Verify the target strike or lock operates within the 3A @ 30V DC contact rating before final energization. Higher-current devices (e.g., heavy-duty electromagnetic locks drawing 4A+) require an interposing relay to protect the switch contacts; confirm current draw on the strike datasheet before ordering. The switch accepts both surface-mounted and flush-mounted installation depending on the electrical box configuration — consult the datasheet diagram for wiring orientation and terminal labeling.

Compatibility spans virtually all modern access control platforms: Salto, Genetec, Honeywell, Bosch, and legacy hardwired 12/24V strike release circuits. BACnet-enabled building automation systems can integrate the CM-2520/48 via a simple relay module or gateway. ONVIF video intercom systems that output 12/24V contact closure can trigger the switch without middleware. The N/O SPST topology is the electrical gold standard for door control — if your system accepts any door button, it accepts this one.

Compliance: The CM-2520/48 carries Manufacturer Warranty and conforms to ADA Accessibility Guidelines (ADA-compliant push plate activation force and location). It does not carry NDAA or Section 889 restrictions. Operate within -40°C to +60°C and away from sustained moisture or direct hose-down; if washdown is required, specify a splash-proof enclosure. For detailed electrical specifications, wiring diagrams, and template cutouts, consult the Camden product catalog.

Jerry Tildsen

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

We've installed the Camden CM-2520/48 on hundreds of retrofit access control jobs — hospitals, office parks, government facilities — and it remains one of the most straightforward combo switches to specify and wire. The real operational win is the 3A @ 30V DC contact rating baked into the switch itself. On a standard 12V strike or maglock, that means no external relay. On a larger job with 30+ doors, you eliminate 30 relay modules, 30 DIN rail slots, and 60+ terminal crimps. Labor savings alone justify the slightly higher unit cost versus a bare push button. The momentary N/O SPST contact is the electrical lingua franca of door control — it talks to every platform, from hardwired BACnet gateways to cloud-based Salto unlock commands. We've never hit an incompatibility in the field. The shallow 1 5/16" mounting depth has been a lifesaver on retrofit installs where the existing double-gang box sits proud of the wall surface and we're working in a tight frame cavity — no need to recess the box or add a surface extension ring.

Technical Highlights:

• 3A @ 30V DC Direct Strike Rating: Most standard 12V and 24V electromagnet strikes and glass-door magnetic locks draw 2–2.5A, falling well within this limit. Eliminates the cost and failure mode risk of an interposing relay on typical installations. If your strike draws more than 3A, the datasheet will tell you upfront — forcing that decision at design time rather than discovery during commissioning.
• Double-Gang Faceplate Consolidation: Combines push button and strike release point in one electrical footprint. On a 20-door project, that's 20 relay modules not shipped, not installed, not field-wired, not maintained. Real TCO gain on large deployments.
• 12/24V AC/DC Voltage Agility: Accepts either AC or DC power without component swapping. Legacy hardwired 24V AC bell systems, modern 12V DC access control panels, and mixed-voltage buildings all work with a single SKU. Reduces inventory and ordering complexity.
• US32/C32D Stainless Steel Finish: Satin finish (not polished) resists visible fingerprints and corrosion in high-touch zones. Hospitals and senior care facilities benefit from the reduced visible wear and easier cleaning compared to bright polished alternatives.
• Silent Momentary Activation: No audible relay chatter or solenoid hum. Particularly valuable in quiet-critical zones — patient recovery rooms, libraries, testing centers — where mechanical door release noise would be perceived as a fault or disturbance.

Deployment Considerations:

• Verify the target strike or magnetic lock current draw before ordering. If the device draws more than 3A @ 30V DC, an interposing relay is required — confirm this on the strike datasheet to avoid on-site rewiring.
• The 1 5/16" depth is shallow but not zero. Check the electrical box installation and wall frame depth to ensure the switch escutcheon doesn't interfere with adjacent conduit, structural framing, or fire-rated cavity insulation. On retrofit jobs, measure the existing box recess before confirming the mount.
• Operating temperature range is -40°C to +60°C. This covers heated indoors and non-freezing vestibules but is not rated for outdoor full-sun exposure or arctic unheated spaces. If the door is transitional (exterior vestibule, unheated loading dock), confirm seasonal temperature extremes before installation.
• The N/O SPST contact is momentary — the switch does not latch. If your system requires a sustained hold signal to keep the strike energized, an external hold relay or maintained contact from your access control panel must provide that function. Most modern strikes are energize-to-lock (safety fail), so momentary release is correct; verify your strike topology in the control system design phase.
• Wire the switch with 18/2 or 16/2 twisted-pair cable to the access control panel strike release output. Shield the pair if running alongside high-current power lines to avoid inductive noise on the contact closure. Consult the datasheet terminal diagram for polarity and wiring order.

The CM-2520/48 is the right choice for integrators and facility managers who need a reliable, standards-based door control point that consolidates hardware and eliminates relays on standard-current strikes. It's not a specialty product — it's the electrical foundation of ADA-compliant, hardwired door access. Pair it with any 12V or 24V electromagnet strike, any access control panel that provides momentary contact release, and any building automation system that recognizes N/O SPST topology. For the full Camden access control and lock/strike portfolio, visit the Camden catalog.