Altronix MAXIMAL77 16-Output Access Power Controller

Altronix MAXIMAL77 Access Power Controller with Integrated Power Supply

Overview

The Altronix MAXIMAL77 is a comprehensive access control power management solution designed for security integrators and system installers who require reliable power distribution and relay switching in a single compact enclosure. This access power controller combines a regulated dual-output 24VDC power supply with integrated charger functionality and 16 independently fused relay outputs, all housed in the industry-standard BC800 enclosure. The MAXIMAL77 delivers 9.7 amperes per supply rail, providing sufficient power for mid-to-large scale access control deployments, door readers, locks, and ancillary devices.

Key Features

• Dual 24VDC Power Supplies: Two independent 24VDC regulated outputs, each rated at 9.7A, enable segregated power distribution and redundancy in access control topologies
• 16 Fused Relay Outputs: Each relay output is individually fused, protecting downstream circuits and allowing selective load isolation without system-wide shutdown
• Integrated Charger: Built-in battery charging capability supports backup power configurations for continuous operation during mains loss
• 115VAC Input: Standard North American single-phase AC input voltage simplifies installation and reduces transformer requirements
• BC800 Enclosure: Compact, wall-mountable steel enclosure with professional finish suitable for electrical closets, telecommunications rooms, and secure areas
• Industrial-Grade Construction: Heavy-duty relay contacts and power distribution bus rated for continuous access control duty cycles

Technical Operation

The MAXIMAL77 accepts 115VAC mains input and conditions it through a transformer-isolated power supply stage to produce two synchronized 24VDC rails at 9.7A each. This dual-supply architecture permits independent control of access door systems, panel-mounted readers, and electric locks without cross-talk or voltage sag affecting parallel devices. All 16 relay outputs are SPDT (single-pole double-throw) contact form, allowing normally-open or normally-closed logic per application requirement. Each relay is backed by individual fuses rated for the relay coil current, preventing single-load failure from disabling the entire output bank. The integrated charger maintains connected backup batteries (typically lead-acid or lithium), ensuring continued lock release and reader power during utility outages.

Installation & System Integration

The MAXIMAL77 mounts in vertical or horizontal orientation within the BC800 enclosure, with screw terminals for 115VAC input and Class 2 output connections (24VDC, relay common, and relay normally-open/normally-closed pairs). Wire terminals accommodate 10–12 AWG copper conductors, supporting standard commercial low-voltage installation practices. The dual 24VDC outputs can be wired in parallel for doubled amperage (19.4A combined) where load analysis permits, or kept separate for redundant, non-interacting subsystems. Relay outputs integrate directly with door strike solenoids, maglocks, request-to-exit sensors, and auxiliary switching logic without intermediary relays in most single-door and multi-door topologies.

Applications

The MAXIMAL77 serves mid-scale access control projects including multi-door office environments, secure facilities, parking access systems, and building automation integrations where simultaneous power distribution and relay switching are required. Its dual-supply design is particularly suited to architectures where redundancy or load segregation demands isolation between access zones or reader banks.

Jerry Tildsen

In my experience deploying mid-scale access control systems, the Altronix MAXIMAL77 offers a practical balance between power capacity and relay switching density. The dual 24VDC supplies at 9.7A each handle typical reader and locking hardware loads without requiring additional step-down supplies, and the 16 fused relay outputs provide flexible logic control for door state monitoring, auxiliary devices, and system interlocks.

Technical Highlights:

• Dual Independent 24VDC Rails: The two 9.7A supplies allow segregated distribution, reducing risk of voltage collapse if one rail encounters a transient load spike. This is invaluable in systems with mixed-impedance readers and solenoids.
• 16 Individually Fused Relays: Each relay is independently protected, so a single shorted load or wiring fault isolates to one relay rather than cascading across the bank. This significantly simplifies troubleshooting in the field.

Deployment Considerations:

• The MAXIMAL77 requires access to 115VAC mains within the enclosure or nearby conduit. Verify site power availability before procurement.
• For systems exceeding 16 switching outputs or requiring greater than 19.4A total 24VDC capacity, plan for stacked or secondary MAXIMAL77 units with coordinated control logic.
• Integrate backup battery charging capacity into the initial design; the built-in charger accepts standard lead-acid or compatible lithium cells to maintain locks during outages.

The MAXIMAL77 is a reliable, proven choice for integrators seeking a compact, all-in-one power and relay solution. Its proven field durability and straightforward wiring make it suitable for both retrofit and new-build access control environments.