Altronix ACM8E 8-Output Fused Relay Access Controller
The Altronix ACM8E is a power distribution and relay controller purpose-built for multi-door access control systems. It accepts a single 12 to 24 VAC or VDC input and routes that power to eight independently controlled outputs, each equipped with its own 3.5A/250V fuse. This architecture means a single power supply can feed multiple magnetic locks, electric strikes, door holders, and other access hardware without downstream bottlenecks — and if one output fails or overloads, the others remain operational. The ACM8E handles trigger signals from card readers, keypads, push buttons, and PIR sensors, making it a bridge between your access control system logic and the physical hardware that releases doors.
Key Features
- Eight independently fused outputs: Each channel carries its own 3.5A/250V fuse, so a fault on one door lock will not take down adjacent outputs — critical in multi-tenant or multi-door deployments where uptime on door 2 should not depend on door 7's health.
- Dual power input option: You can run a single power source for both the controller board and all lock power, or isolate them into separate inputs — flexibility that matters when retrofitting existing systems or isolating noisy loads from control logic.
- Configurable output types: Each channel can operate as a 2.5A direct power output or as a 5A-rated dry form-C relay output, letting you drive both powered and relay-logic devices from the same chassis without external adapters.
- Eight trigger inputs (any combination): All eight inputs accept either normally-open contact closure or open-collector sink logic — no need to build separate interface cards for mixed trigger sources.
- Fire alarm disconnect per output: Each channel independently selects whether a FACP (fire alarm control panel) disconnect signal forces that output OFF — essential in jurisdictions requiring emergency egress override, and you can apply it selectively (lock on door 1 releases, door 2 stays secure if required by code).
- UL Listed to UL294: Meets the standard for access control power supplies and controllers, satisfying code compliance and insurance requirements without additional third-party validation.
- Board current draw: Only 0.6A @ 12V or 0.3A @ 24V, meaning the ACM8E itself is a negligible load — your main power budget goes entirely to the door hardware. The 10A main fuse protects the entire controller if something inside fails.
- LED supervision: Red LED shows when relays are energized; green indicates FACP disconnect triggered — allows you to troubleshoot without a meter or software interface.
Integration & Compatibility
The ACM8E accepts 8 trigger inputs and provides FACP interface capability, meaning it integrates into larger access control and fire-life-safety ecosystems. The relay outputs work with any 5A-or-less device (mag locks, strikes, holders, solenoids, door position sensors with relay inputs), and the direct power outputs serve powered devices directly. Total output current is capped at 10A — determined by your power supply — so you cannot run all eight outputs at full 3.5A simultaneously; plan your load distribution accordingly. This is standard for distributed architecture and why the individual fuses matter: they force load sharing across the eight channels rather than allowing one output to monopolize available current.
Physical & Environmental
Housed in a 15.5" H × 12" W × 4.5" D enclosure suitable for wall or equipment-rack mounting, the ACM8E weighs 8.35 lb and operates from 0°C to 49°C — typical for indoor security infrastructure. Storage temperature range extends to −20°C to 70°C, allowing the unit to be shipped or staged in unheated warehouses without damage.
When to Choose a Different Model
If you need more than eight outputs, explore higher-channel-count controllers in the Altronix power infrastructure family. If your access control system requires integrated relay logic (AND/OR gates, timers, scheduling), look for dedicated access control panels rather than a passive power distributor. For applications requiring SNMP monitoring or IP-based status reporting, the ACM8E is analog-only; you would need a networked controller.
Frequently Asked Questions
Q: Can I mix 12V and 24V inputs on the same ACM8E?
A: No. The ACM8E accepts either 12–24 VAC or 12–24 VDC as a single input voltage range. You must use one input voltage throughout. Some models in the Altronix range support dual isolated inputs; confirm your configuration before ordering if you need both voltage rails.
Q: What happens if all eight outputs are triggered simultaneously?
A: All eight relays energize, but the total output current drawn cannot exceed 10A (set by your power supply capacity). If the combined load exceeds 10A, the main 10A fuse trips, shutting down all outputs. Each channel's individual 3.5A fuse protects that channel from overcurrent if the device it powers draws more than 3.5A. Always calculate total lock current before deployment.
Q: Does the ACM8E work with my existing fire alarm panel?
A: The ACM8E has a FACP interface for emergency egress signaling. Your fire alarm panel must support relay-form-C (dry contact) outputs. Check your panel's documentation and your local fire code before assuming compatibility. The connection is standard but must be wired correctly during installation.
Q: Is the ACM8E suitable for outdoor installation?
A: The ACM8E operates 0°C to 49°C and is not rated IP67 or higher. It is designed for indoor electrical enclosures or heated/cooled equipment rooms. For outdoor access hardware, mount the ACM8E indoors and run weatherproofed cables to outdoor locks.
Q: Can I use the ACM8E with wireless door locks or smart devices?
A: The ACM8E is a hardwired power and relay controller. It works only with devices that accept 12–24V power or relay-contact triggering. Wireless locks and IoT devices require a separate wireless controller or gateway; the ACM8E cannot communicate with them directly.
Q: What is the warranty?
A: Altronix provides a limited lifetime warranty on the ACM8E. Check the documentation for any specific exclusions (physical damage, misuse, water immersion).
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Altronix ACM8E is one of the workhorses in enterprise access control power distribution. I spec this unit repeatedly because it enforces fault isolation through per-channel fusing — if a mag lock shorts or a wiring error occurs on output 5, the other seven doors stay unlocked and operable. That reliability margin matters in multi-tenant buildings, healthcare facilities, and secure warehouses where downtime on any single door ripples through operations and security audits.
Technical Highlights:
- Eight independently fused outputs (3.5A/250V each): A single-point failure on one lock does not cascade to adjacent hardware. This is not a luxury in 8-door, 16-door, or campus-scale deployments.
- Dual power input option: Run board logic and lock power from the same supply, or isolate them — useful when retrofitting systems with existing infrastructure or when local ground loops require separation.
- Maximum 10A aggregate output current: Plan your load carefully. Eight 2A mag locks will overload the 10A fuse; you need either a larger supply or to stagger door triggers in your access control logic.
- Configurable Fail-Safe / Fail-Secure per output: The form-C relay outputs let you choose whether a power loss triggers door release or lock engagement — and you can vary this per door to match code and operational policy.
- UL294 certification: Insurance and code officials recognize this without pushback. No field validation or letter-of-explanation needed.
Deployment Considerations:
- Load calculation is non-negotiable. A 2A mag lock on each of four doors plus a 1A door holder = 9A — fine. Add a fifth lock and you trip the main fuse. Integrators often miss this in rushed projects; always sum actual device current draw before ordering the power supply.
- The FACP disconnect feature is powerful but requires correct wiring to the fire panel and compliance with local fire codes. Misunderstanding the disconnect logic (does it release or lock on alarm?) has caused code violations and failed inspections — confirm jurisdiction requirements before design.
- LED indicators (red for relay energized, green for FACP disconnect) are helpful for basic troubleshooting but do not provide remote monitoring. If you need IP-based status or alerts, layer in a separate gateway or monitoring system.
Deploy the ACM8E in multi-door access control systems where reliability and per-port fault isolation outweigh the need for remote IP monitoring. It is the correct choice for hospitals, office parks, data centers, and secure warehouses where a single door's failure must not compromise the other seven.
