Altronix ACM8CB 8-Output Access Power Controller
The Altronix ACM8CB is a multi-output power distribution board that converts a single 12 to 24 VAC or VDC input into eight independently controlled Class 2 rated outputs. This is a compact, board-level controller designed to sit in a rack, enclosure, or cabinet and route power from a single source to electromagnetic locks, electric strikes, magnetic door holders, and other access control hardware. Each output is PTC protected and auto-resettable, rated at 2.5A maximum, with a combined output capacity of 10A. Trigger inputs accept open collector sink or normally open dry contacts from card readers, keypads, push buttons, PIR sensors, or access control systems.
Key Features
- Eight independent outputs with PTC protection: Each output auto-resets on overcurrent without manual intervention or fuse replacement — eliminates downtime from blown fuses when a mag lock jams or shorts temporarily. Total system current is capped at 10A, so you won't exceed your main power source capacity.
- 2.5A per output rating: Sufficient for standard electromagnetic locks, electric strikes, and magnetic door holders. If you need higher individual loads, you'll outgrow this controller — verify your heaviest device draw first.
- Accepts open collector and dry contact triggers: Works with card readers, PIR motion sensors, push buttons, and most access control panels without requiring relay isolation. Simplifies wiring and reduces external components.
- Fail-Safe and Fail-Secure modes selectable per output: Fail-Safe unlocks on power loss for emergency egress compliance; Fail-Secure keeps locks engaged. Configure each output independently for mixed deployment scenarios (e.g., secure doors stay locked, emergency exits unlock on power failure).
- Single or dual power input configuration: Dual input option provides redundancy — if one power source fails, the second takes over, ensuring continuous access control without gaps.
- FACP (Fire Alarm Control Panel) interface: Integrates with building fire alarm systems for emergency egress and alarm monitoring. Each output can be individually disconnected by the fire panel on alarm activation to unlock doors for evacuation.
- Individually selectable fire alarm disconnect per output: Fine-grained control over which access points unlock during a fire alarm — essential for life-safety compliance and building code adherence.
- UL Listed for access control and general signaling equipment: Complies with UL294 safety standards, required for most commercial and institutional deployments. cUL listing covers Canadian installations.
Integration & Compatibility
The ACM8CB integrates with most access control architectures: standalone systems using local triggers, distributed systems via relay modules, and modern IP-based access panels via relay output. The board's compact 8" × 4" × 0.75" footprint fits standard 19" server racks or shallow wall-mount enclosures. A 10A/250V main fuse protects the entire board; ensure your upstream power supply capacity exceeds the maximum current draw of all connected devices.
Operating temperature range of 0°C to 49°C (32°F to 120°F) limits outdoor cabinet deployments to climate-controlled or insulated enclosures — unheated outdoor cabinets in cold climates may drop below the minimum operating range.
When to Choose a Different Model
If you need higher per-output current (e.g., 5A or 10A devices) or more than eight outputs, evaluate other Altronix power distribution controllers in the access control family. If you require integrated surge suppression, battery backup, or fire alarm isolation as built-in functions rather than configurable options, a larger integrated power and communication module may be more cost-effective than combining separate boards.
Frequently Asked Questions
Q: Does the ACM8CB support battery backup or UPS integration?
A: No. The ACM8CB is a power distribution controller only, not a power supply. It accepts 12–24VAC or VDC from an external source (e.g., transformer, rectifier, or battery backup panel). To add battery backup, connect the ACM8CB downstream of a UPS or battery-backed power supply.
Q: Can I mix AC and DC inputs on the dual input configuration?
A: No. Both inputs must be the same voltage type — either both VAC or both VDC. The ACM8CB passes through whichever input is active (typically determined by priority or failover logic). Check the datasheet for dual-input sequencing details.
Q: What triggers can I use with the ACM8CB?
A: The board accepts open collector sink (NPN) or normally open dry contact inputs. These are compatible with card readers, push buttons, PIR sensors, relay outputs from access control panels, and photoelectric switches. Do not connect powered outputs or voltage sources directly to trigger inputs.
Q: Does the ACM8CB have any built-in surge protection?
A: No internal surge protection is listed in the specifications. If your deployment is subject to lightning or power surges, install external surge suppression (e.g., MOV modules or dedicated surge suppressors) on the input and output lines.
Q: Is the ACM8CB's fire alarm disconnect function automatic or manual?
A: It is automatic when triggered by a FACP. The fire alarm panel sends a signal to unlock designated outputs. Configuration of which outputs disconnect on alarm activation is selectable — typically via a DIP switch or jumper during installation.
Q: What's the warranty coverage on the ACM8CB?
A: Altronix provides a Lifetime Limited Warranty. This covers manufacturing defects and failures under normal use. Damage from surge events, overcurrent abuse, or environmental extremes outside the 0–49°C operating range are typically not covered.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Altronix ACM8CB is a compact, reliable power distribution controller for small to mid-scale access control deployments. It handles the core job well: converting a single power source into eight independently managed outputs with automatic overcurrent protection. The PTC protection is practical — no fuse replacement trips, just auto-reset on fault. UL294 listing and FACP integration are non-negotiable for commercial installations, and this board delivers both.
Technical Highlights:
- PTC auto-resetting protection per output: Eliminates the downtime of blown fuses. When a lock jams or a contact shorts, the output simply resets automatically — no trip to the panel, no spare fuses needed on hand.
- 10A total system capacity with 2.5A per output: Sufficient for most electromagnetic locks (typically 0.5–2A each) and electric strikes (1–2.5A). If all eight outputs are maxed simultaneously, you're at exactly the 10A limit — plan your device loads carefully and never assume you can push all outputs to 2.5A at once.
- Selectable Fail-Safe and Fail-Secure modes per output: Mixed-mode operation is a practical feature: emergency exit doors unlock on power loss, while secure storage doors remain locked. Reduces the need for separate controllers for different device types.
- Dual power input for redundancy: If your building has split power branches or separate backup feeds, configure both — one becomes primary, one backup. Single points of failure in access control are expensive to debug on-site.
Deployment Considerations:
- The board itself does not include a power supply — you must provide a 12–24VAC or VDC source upstream. Most integrators pair this with a dedicated access control transformer or 24VDC rectified supply already in the rack.
- Operating temperature floor is 0°C; outdoor cabinets in northern climates without climate control will fail in winter. Plan for a heated enclosure or move the board indoors if you're in a freeze-prone region.
- No surge suppression built in. In lightning-prone or electrically noisy environments, expect to add external MOV blocks or surge modules on input and output rails — a $20–50 add-on that prevents a $300 replacement board.
- The eight outputs are powerful but not infinite — verify that the sum of all connected device currents does not exceed 10A at any point. One overlooked 3A lock on output 5 and a 2.5A strike on output 3 leaves very little headroom for the remaining six outputs.
Best suited for access control closets, network rack integrations, and small-scale distributed door control where you need reliable, code-compliant power routing without the overhead of larger integrated systems. Common deployment: fire-rated wall cabinet with 24VDC supply, modem or access panel, and this ACM8CB feeding six secure doors and two emergency exits on a single branch circuit. Proven, no surprises.
