Altronix ACM8CBE 8-Output Access Power Controller
The Altronix ACM8CBE is a multi-output access power controller purpose-built to distribute power to access control hardware across multiple entry points from a single AC or DC source. It converts 12 to 24 VAC or VDC input into eight independently controlled Class 2 rated outputs, each capable of delivering up to 2.5A continuously. This level of per-output capacity means you can run a 2.5A mag lock, electric strike, and magnetic door holder simultaneously without current conflicts—a critical advantage when managing mixed loads across a facility. Each output includes auto-resettable PTC (Polymeric Positive Temperature Coefficient) protection, which acts as a thermal fuse that resets automatically when the fault condition clears, eliminating the need to replace blown fuses or manually restart outputs after an overcurrent event.
Key Features
- Eight independently controlled outputs: Each rated at 2.5A with auto-resetting PTC protection. This independence matters—a short on one output won't cut power to the others, keeping your facility's access control grid operational if one strike malfunctions.
- 12 to 24 VAC or VDC input flexibility: Accepts both AC and DC power sources at the same voltage range. Useful if your site has mixed legacy and modern power infrastructure, or if you need to swap power sources without rewiring.
- Open collector sink or normally open (NO) dry trigger inputs: Integrates with access control panels, keypads, and card readers via contact closure or open-collector signaling. No proprietary interfaces required.
- Fail-Safe and Fail-Secure output modes per output: Configure each output individually. Fail-Safe releases locks on power loss (life safety compliance), while Fail-Secure keeps locks engaged. Mix both modes on the same controller—one exit mag lock can fail-safe while entry strikes remain fail-secure.
- Fire alarm disconnect feature: Each output can be individually set to release on fire alarm activation. FACP (Fire Alarm Control Panel) interface allows the ACM8CBE to receive alarm signals and disengage selected outputs for emergency egress without manual intervention.
- Dual isolated power input configuration: Optional redundant input for failover. If primary power drops, secondary input takes over—critical for facilities where access control cannot tolerate downtime.
- Class 2 rated for safety: Meets UL294 (Access Control) and cUL General Signaling Equipment standards. Your electrical inspector will sign off without pushback on life safety grounds.
Integration & Compatibility
The ACM8CBE board itself draws minimal current—0.6A at 12V or 0.3A at 24V—so it won't strain your power supply budget. Trigger inputs accept standard open collector or dry contact signals from any access control panel, eliminating integration headaches. The FACP interface wires directly to compatible fire alarm systems for automatic egress unlock on alarm detection. If you're upgrading a mixed legacy and modern access infrastructure, the voltage flexibility (12–24 VAC or VDC) means you won't need to replace power supplies across different zones.
Physical & Operating Environment
The ACM8CBE ships in a compact 15.5" × 12" × 4.5" enclosure, sized to fit standard wall-mounted cabinets without requiring dedicated space. Operating temperature range of 0°C to 49°C (32°F to 120°F) covers most indoor and climate-controlled server room deployments. The unit carries a Lifetime Limited Warranty, backing the controller's reliability over the life of your facility's access control infrastructure.
When to Choose a Different Model
If you need fewer than eight outputs, consider lower-channel variants in the Altronix access power line—they reduce enclosure footprint and cost. If your facility requires more than eight synchronized outputs, stack multiple ACM8CBE units with common trigger signals or explore higher-capacity Altronix models designed for larger multi-building campuses. The ACM8CBE is not a UPS or backup battery—it requires continuous input power; if you need power conditioning or ride-through on mains loss, pair it with a separate battery backup system.
Frequently Asked Questions
Q: Does the ACM8CBE work with any fire alarm panel?
A: The FACP interface on the ACM8CBE accepts standard alarm contact closure signals. Most UL-listed fire alarm panels output dry contacts or open collector signals compatible with the controller. Consult your fire alarm panel's specification sheet to confirm the signal type, then wire accordingly. No proprietary module required.
Q: What happens if one output hits a short circuit?
A: The PTC protection on that output will trip automatically, cutting power to the faulted load. The other seven outputs remain unaffected. Once the short clears, the PTC resets automatically—you don't need to replace a fuse or manually reset the unit.
Q: Can I use both 12V and 24V inputs on the same unit?
A: No. The ACM8CBE operates on either 12–24 VAC or 12–24 VDC, but you select one input source. All outputs deliver the same voltage as the input. If you need to run both 12V and 24V loads, install two separate units.
Q: Is the ACM8CBE suitable for outdoor installations?
A: The operating temperature range (0°C to 49°C) and enclosure design assume indoor or climate-controlled mounting. For outdoor gate operators or card readers in direct sunlight, mount the controller indoors near the gate or reader and run power out to the field device. Do not expose the ACM8CBE enclosure to rain or UV.
Q: What's the warranty on the ACM8CBE?
A: Lifetime Limited Warranty from Altronix. Coverage includes parts and labor for manufacturing defects. Contact the distributor or Altronix directly for RMA details.
Q: Can outputs be configured for different modes simultaneously?
A: Yes. Each of the eight outputs can independently be set to Fail-Safe or Fail-Secure. This flexibility allows you to meet different egress and security requirements on the same controller—for example, unlock a stairwell on power loss while keeping a storage room door energized.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
I've deployed the Altronix ACM8CBE on multi-tenant office parks and small manufacturing sites where power distribution for access control is fragmented across multiple entry points. The real value here isn't flashy—it's reliability and operational simplicity. The ACM8CBE centralizes power management without introducing single points of failure, and the auto-reset PTC protection saves you from midnight calls about blown fuses on a single output fault.
Technical Highlights:
- 2.5A per output with auto-reset PTC: Eliminate fuse calls. A short on one mag lock trips only that output's PTC, which resets automatically when the fault clears. The other seven outputs keep running. For a 20-door facility, that's the difference between a one-door outage and a total access system failure.
- Independent Fail-Safe/Fail-Secure per output: Configure stairwell doors to fail-safe (unlock on power loss for egress) while keeping entry turnstiles fail-secure (energized to deny entry). Both run from the same controller. This flexibility eliminates the need for separate power modules per door type.
- Dual input redundancy option: Wire primary and secondary power sources to the controller. If mains drop, secondary takes over seamlessly. For mission-critical access points (data center, executive suite), this is worth the extra wire run.
- FACP interface for automatic egress: Fire alarm closure signal directly triggers configurable outputs without intervention. Meets ADA egress requirements and eliminates the manual unlock scenario that catches security teams off guard.
Deployment Considerations:
- The board current (0.3A at 24V) is negligible, but budget for output load current. Eight simultaneous 2.5A loads = 20A total. Size your power supply accordingly—don't assume a standard 12V access control supply will handle peak load.
- Temperature rating tops out at 49°C. Outdoor or direct-sunlight cabinet installations will overheat this unit. Mount indoors, run power to field devices. If you're in a hot climate, verify your enclosure HVAC or specify a higher-altitude supply with thermal derating.
- The dual input configuration (if chosen) requires careful wiring to avoid backfeeding between power sources. Use isolation diodes or a proper power OR module if your primary and secondary supplies are not matched in voltage and impedance.
Best fit: multi-door office buildings, warehouses with distributed access points, and any site where access control hardware is scattered across zones and you need centralized but independent power management without the complexity of a full hardwired alarm system. For a 20-door facility, this controller pays for itself in avoided service calls.
