Altronix MAXFIT77FD 8-Output DC Power Distribution Module

Overview

The Altronix MAXFIT77FD is a compact, multi-output DC power distribution module rated for 2–24VDC input at up to 10A total output — purpose-built for integrators who need to cleanly distribute power from a single supply across multiple access control readers, locks, or surveillance devices without running individual power runs back to a central panel. At 8.00 x 4.50 x 1.25 inches and under a pound, it fits inside almost any backbox or enclosure where space is at a premium.

Altronix has built its reputation on field-serviceable, installation-friendly power products, and the MAXFIT77FD follows that pattern — eight individually fused or managed output positions, each rated at 2.5A, feeding from a shared 10A bus. If you've ever had a single shorted device on a daisy-chain knock out an entire access control run, the per-channel architecture here is the answer. For a deeper look at the broader Altronix power solutions catalog, the full line covers everything from small backbox supplies to rack-mount multi-channel systems.

Key Features

• Wide Input Voltage Range (2–24VDC): Accepts input from 2 to 24VDC, which means it integrates with virtually any low-voltage DC power supply already on-site — 12VDC access control supplies, 24VDC panel outputs, or intermediate bus voltages. No need to standardize your upstream supply to use this module.
• 10A Total Output Capacity: The 10A aggregate output is enough headroom to drive a full complement of eight outputs simultaneously under typical load conditions. Sized correctly for mixed loads like mag locks (500–600mA each), card readers (100–200mA each), and sensors — the math works without needing to derate heavily.
• 8 Individually Managed Output Positions: Eight discrete output channels let you assign one device per circuit. This is the critical advantage over daisy-chain wiring: a fault or short on one device stays isolated — the remaining seven outputs keep running. For access control installations where a single door staying unlocked is a security event, per-channel isolation matters.
• 2.5A Per Output Channel: Each of the eight positions is rated at 2.5A — enough to drive a single electromagnetic lock (typically 500–600mA) with substantial margin, or to handle a reader plus a lock on the same output if your load math supports it. Gives flexibility in how you assign loads without constant derating concerns.
• Compact Form Factor (8.00 x 4.50 x 1.25 in): At just over an inch deep and well under a pound at 0.95 lbs, the MAXFIT77FD fits inside standard double-gang backboxes, access control enclosures, or the dead space in a server room enclosure. No dedicated rack unit or large enclosure required for the distribution module itself.
• Low Mass for Enclosure Mounting: The 0.95 lb weight means enclosure door or sidewall mounting doesn't require additional structural reinforcement. Relevant when you're mounting inside a lightly constructed backbox or a pre-punched plastic enclosure where payload weight is a design constraint.

Integration and Compatibility

The MAXFIT77FD is input-agnostic within the 2–24VDC range, making it compatible with the broad range of Altronix power supplies that output 12VDC or 24VDC — including the MAXFIT and NetWay series. It is designed to pair with access control panels, power supply units, and low-voltage surveillance equipment operating in that voltage window. Always verify that the sum of your per-channel loads stays under the 10A aggregate bus limit and that individual device draws don't exceed 2.5A per output. When planning deployments with multiple modules, route each MAXFIT77FD from a dedicated supply circuit to maintain isolation between door groups — a best practice for both fault containment and code compliance on larger access systems. Integrators pairing this module with IP surveillance cameras should confirm camera power input compatibility, as most PoE cameras draw from Ethernet rather than a discrete DC supply.

Frequently Asked Questions

Q: What input voltage range does the MAXFIT77FD accept?

A: The MAXFIT77FD accepts 2–24VDC input, making it compatible with standard 12VDC and 24VDC low-voltage power supplies commonly used in access control and surveillance installations.

Q: How many output channels does the MAXFIT77FD provide, and what is the per-channel current rating?

A: It provides 8 output channels, each rated at 2.5A maximum. The total aggregate output across all channels is 10A — keep the sum of all simultaneous loads under that threshold when planning your installation.

Q: Can the MAXFIT77FD be used with electromagnetic door locks?

A: Yes. Standard electromagnetic locks draw approximately 500–600mA at 12VDC or 24VDC, which is well within the 2.5A per-channel rating. Each channel has enough headroom to drive a mag lock with margin, or a lock plus a card reader on the same output if total draw stays under 2.5A.

Q: What are the physical dimensions and weight of the MAXFIT77FD?

A: The unit measures 8.00 x 4.50 x 1.25 inches and weighs 0.95 lbs, making it suitable for installation inside standard access control enclosures or backboxes without requiring additional structural support.

Q: Does the MAXFIT77FD provide per-channel fault isolation?

A: The 8-channel architecture is designed so that each output is independently managed. A fault condition on one output channel does not automatically affect the remaining seven — a key advantage over daisy-chain wiring in life-safety and access control applications where continuous operation of other doors is required.

Karl Wilson

The MAXFIT77FD's 2.5A-per-channel rating is the number I look at first when evaluating a distribution module for access control work. At 2.5A per output across 8 channels with a 10A aggregate bus, this module sits in the sweet spot for mid-size deployments where you need to drive four to eight doors from a single power source without building a custom wiring harness. It's a well-matched fit for the typical eight-door access controller scenario where your upstream supply is already in the 12–24VDC range.

Technical Highlights:

• 10A Aggregate / 2.5A Per Channel: Total bus capacity supports a fully loaded 8-output deployment as long as per-device draws are realistic — mag locks at ~550mA each leave you running at roughly 44% of total bus capacity across all eight doors, which is exactly the kind of thermal and electrical headroom you want in a 24/7 commercial installation.
• 2–24VDC Input Range: Input flexibility is underrated on modules like this. If you're retro-fitting into a site that already has a 12VDC supply on one wing and a 24VDC output on another, the MAXFIT77FD can drop in on either without a separate voltage conversion step.
• Compact Profile (8.00 x 4.50 x 1.25 in, 0.95 lbs): At just 1.25 inches deep, it fits behind most access control panels in a standard single-door backbox. That's the difference between a clean installation and running a separate sub-enclosure for power distribution.

Deployment Considerations:

• Always calculate aggregate load before commissioning. Eight channels at 2.5A each theoretically sum to 20A, but the bus is capped at 10A — plan your load distribution so simultaneous peak draw across all active channels never approaches that ceiling.
• The 2–24VDC input range assumes a stable, regulated upstream supply. Unregulated or fluctuating inputs near the 24V ceiling can stress downstream devices — verify your upstream supply is regulated before connecting sensitive readers or controllers.

This module is well-suited for eight-door commercial access control deployments — hotel corridors, office floor buildouts, or warehouse entry zones — where a single regulated supply needs to fan out cleanly to individual door hardware without single-point-of-failure wiring topology.