Altronix MAXFIT77F8SD Dual Power Supply with 8 Supervised Outputs in BC750 Enclosure
Overview
The Altronix MAXFIT77F8SD is a dual-power-supply assembly that delivers two independent 24VDC/10A output sources and eight individually supervised distribution outputs — all pre-wired and mounted inside Altronix's BC750 enclosure. If you're deploying a mid-to-large access control or IP surveillance infrastructure and need fault-tolerant, centralized 24VDC distribution without building the panel yourself, this unit removes most of the integration labor up front. The MAXFIT77F8SD ships as a ready-to-wire assembly: both power supplies installed, outputs terminated, enclosure ready for wall mounting.
The Altronix product line has long been the reference point for security power supplies in commercial integrations — this unit represents the high-capacity end of their pre-assembled MAXFIT range, suited to larger deployments where a single power supply isn't enough capacity and where downtime from a single-point failure is unacceptable.
Key Features
- Dual 24VDC / 10A Power Supplies: Two independent 24VDC sources each rated at 10A — total available output current is 20A across the assembly. Running two supplies means if one fails, the second continues to power loads. For access control panels, lock hardware, or PoE midspans that cannot tolerate a complete power outage, this redundancy architecture matters more than any individual supply's amperage rating.
- 8 Supervised Outputs: Eight individually distributed output circuits let you run discrete wire runs to separate doors, camera clusters, or field devices. Per-output supervision means a fault — open circuit, short, or overload — on one run won't collapse the entire distribution panel, and you can isolate the troubled circuit without pulling down adjacent loads.
- BC750 Enclosure: The BC750 is a steel enclosure sized for wall-mount deployment in an IDF closet, server room, or security head-end. At 16.50 × 20.50 inches (and 6.25 inches deep) it provides room for the dual power supplies, output distribution, and supplemental battery backup if your design calls for it. The enclosure's footprint is worth confirming against your rack or wall space before ordering — at 24.8 lbs installed weight, this is a two-person hang.
- Pre-Assembled MAXFIT Configuration: Altronix ships the MAXFIT77F8SD as a factory-built assembly. Both supplies are mounted and wired to the distribution board before it leaves the factory. On a multi-door deployment this saves several hours of panel-build time versus sourcing the components separately — and reduces the risk of wiring errors under field conditions.
- 24VDC Output Voltage: The 24VDC output is the standard rail for most commercial electromagnetic locks, electric strikes, and a wide range of access control panel auxiliary power inputs. If your hardware specifies 12VDC, this unit is not the right fit — confirm your load requirements before specifying.
- Scalable Distribution Architecture: Eight outputs on a 20A-capable dual-supply platform means you can assign outputs by zone or by device type — grouping locks on dedicated circuits separate from panel auxiliaries, for example — without straining any single output. Design headroom for future device additions without rebalancing the panel.
Integration & Compatibility
The MAXFIT77F8SD is designed for integration within commercial access control and video surveillance infrastructure where 24VDC is the standard distribution voltage. It is compatible with the broad range of Altronix accessory boards, relay modules, and battery backup options that mount within the BC750 form factor — consult the Altronix product catalog for specific expansion modules that fit this enclosure.
When planning your power supply sizing, account for both steady-state current draw and inrush peaks — electromagnetic locks in particular can spike well above their rated hold current on engagement. The dual-supply architecture here provides capacity headroom, but a proper load calculation per output circuit remains essential before commissioning.
For deployments requiring battery standby, verify that your chosen Altronix battery expansion module is rated for this enclosure variant. The BC750 enclosure physically accommodates sealed lead-acid batteries depending on AH rating — confirm dimensions and weight capacity with your battery selection before finalizing the design.
Frequently Asked Questions
Q: What is the total output current available from the MAXFIT77F8SD?
A: The MAXFIT77F8SD contains two independent 24VDC/10A power supplies, providing up to 10A per supply — 20A total across the assembly when both supplies are operational.
Q: How many output circuits does the MAXFIT77F8SD provide?
A: The MAXFIT77F8SD provides 8 individually supervised output circuits, allowing discrete distribution runs to separate devices or zones.
Q: What enclosure does the MAXFIT77F8SD ship in?
A: It ships pre-assembled in Altronix's BC750 steel enclosure, which measures 16.50 × 20.50 × 6.25 inches and weighs 24.8 lbs installed.
Q: Is the MAXFIT77F8SD suitable for 12VDC loads?
A: No — the MAXFIT77F8SD outputs 24VDC. It is not appropriate for devices that require 12VDC. Verify your load specifications before ordering.
Q: Does the MAXFIT77F8SD arrive pre-wired and ready to install?
A: Yes. Both power supplies are factory-mounted and wired to the output distribution board inside the BC750 enclosure. Field installation is limited to incoming AC wiring, output circuit connections, and wall mounting.
Q: Can battery backup be added to the MAXFIT77F8SD?
A: The BC750 enclosure is designed to accommodate Altronix battery expansion accessories. Confirm the specific battery module and AH rating compatibility with the Altronix MAXFIT77F8SD configuration before specifying.
The MAXFIT77F8SD is the unit I specify when a deployment has outgrown a single-supply panel but the team doesn't want to build a custom distribution cabinet from scratch. Two independent 24VDC/10A supplies in one factory-assembled BC750 enclosure is a genuine time-saver on multi-door projects — and the dual-supply redundancy is the right answer any time the customer asks what happens when a supply fails.
Technical Highlights:
- Dual 10A Supplies at 24VDC: Each supply handles up to 10A independently — 20A total. On a 10-door project with EM locks averaging 500mA each, you have significant headroom for panel auxiliaries and future expansion without rebalancing circuits.
- 8 Supervised Outputs: Per-circuit supervision lets you isolate a fault without disrupting adjacent zones. On a multi-tenant or multi-floor build, that fault isolation is the difference between a service call that affects one door and one that shuts down an entire wing.
- Factory Assembly in BC750: Altronix pre-wires both supplies to the distribution board before shipment. In my experience this eliminates a half-day of panel build on a typical installation — and removes a category of wiring errors that tend to surface during commissioning.
Deployment Considerations:
- At 24.8 lbs and 20.50 inches tall, the BC750 enclosure needs a solid wall anchor — plan for two-person installation and verify your wall substrate can carry the load, especially if battery modules are added later.
- This unit outputs 24VDC only. If any loads in your design require 12VDC — certain older readers, some legacy sensors — you'll need a separate supply or step-down for those circuits. Mixing voltage requirements into a single 24V distribution panel is a common source of commissioning problems.
The MAXFIT77F8SD earns its place in commercial access control head-ends for multi-tenant office builds and education facilities where 24VDC lock hardware is standardized across the site and where a single supply failure cannot be acceptable downtime.
