Altronix MAXFIT11FD 4A Dual-Voltage Access Control Power Supply
Overview
The Altronix MAXFIT11FD is a dual-voltage access control power supply rated at 4 amps on both 12VDC and 24VDC outputs, housed in a UL Listed steel enclosure sized at 16.5" W x 20.5" H x 6.25" D. Designed for indoor installation, the MAXFIT11FD fits commercial access control builds where both 12V and 24V field devices need a single, code-compliant power source without daisy-chaining separate supplies.
Key Features
- Dual Selectable Output Voltage (12VDC / 24VDC): Many access control panels and electrified hardware — strikes, maglocks, REX devices — differ in operating voltage between manufacturers. Having both rails available from one enclosure eliminates the need for a second supply and the wiring overhead that comes with it.
- 4 Amp Continuous Output: At 4A per output, the MAXFIT11FD comfortably powers multiple door controllers or locking devices on a single run. Size your load budget conservatively — account for inrush on electric strikes, which can spike 2–3× rated current at release.
- 2 Outputs: Two independent power outputs let you segment zones or device types, simplifying fault isolation if a field device develops a short without taking down the entire panel power bus.
- UL Listed Enclosure: UL Listing on a power supply matters for AHJ sign-off in commercial occupancies and is often required by insurance underwriters on life-safety-adjacent systems. The MAXFIT11FD carries that listing out of the box.
- Steel Enclosure Construction: The steel cabinet provides physical tamper resistance appropriate for IDF closets and equipment rooms. Steel also dissipates heat more predictably than plastic under continuous load.
- Indoor-Rated Only: This unit is specified for indoor installation. Do not deploy in untempered spaces — mechanical rooms that swing below freezing in winter or unconditioned exterior enclosures require a supply with an extended operating temperature rating.
- 16.5" x 20.5" x 6.25" Footprint: Verify panel room or closet depth before ordering. The 6.25" depth requires adequate wall clearance; surface-mount in shallow telecom closets may require an extension ring or alternate mounting strategy.
Integration and Compatibility
The MAXFIT11FD is engineered for access control applications alongside Altronix ACM8CB and BC750 components, making it a natural fit in Altronix-ecosystem builds. The dual 12VDC/24VDC output supports a broad range of electrified hardware from major access control manufacturers. Confirm operating voltage and inrush specifications for each connected device before commissioning — mismatched voltage is the most common field wiring error on multi-vendor installs. For access control power products, always verify total connected load stays below 80% of rated output for continuous-duty reliability. Explore the full Altronix power supply catalog for complementary enclosures, battery backup modules, and multi-output distribution boards. If your project requires outdoor power distribution, review surveillance power products with extended temperature ratings before specifying. For PoE-based camera deployments that can eliminate separate power runs entirely, PoE switches may reduce panel complexity on camera circuits.
Frequently Asked Questions
Q: Is the MAXFIT11FD rated for outdoor installation?
A: No. The MAXFIT11FD is specified for indoor use only. Outdoor or untempered environments require a supply with an appropriate environmental rating.
Q: What output voltages does the MAXFIT11FD support?
A: The MAXFIT11FD provides both 12VDC and 24VDC outputs, each rated at 4 amps, on two independent output channels.
Q: Is the MAXFIT11FD UL Listed?
A: Yes. The MAXFIT11FD carries a UL Listing, supporting AHJ approval in commercial access control installations.
Q: What are the physical dimensions of the MAXFIT11FD enclosure?
A: The enclosure measures 16.5 inches wide by 20.5 inches high by 6.25 inches deep.
Q: How many outputs does the MAXFIT11FD have?
A: The MAXFIT11FD provides 2 independent power outputs, allowing zone segmentation or separation of device types on a single supply.
Q: What is the enclosure material on the MAXFIT11FD?
A: The enclosure is steel, providing physical tamper resistance and predictable thermal performance under continuous load.
The MAXFIT11FD is the supply I reach for when a project mixes 12V and 24V field hardware in the same closet and the AHJ wants a single UL Listed source for the access control power circuit. The dual-voltage architecture — 4A at 12VDC and 4A at 24VDC simultaneously — means you are not stacking two separate boxes or running a second conduit home for the voltage mismatch.
Technical Highlights:
- 4A per output rail: Enough headroom for multiple electrified strikes or a maglock plus door controller on each channel — but budget for inrush, which on many strikes runs 2–3× the hold current at the moment of release.
- 2 independent outputs: Zone separation matters when a field device shorts; with two discrete outputs you isolate the fault without dropping power to the whole panel bus.
- UL Listed steel enclosure (16.5" x 20.5" x 6.25"): The UL mark closes the AHJ conversation on most commercial jobs. Verify your closet depth — 6.25" is not shallow, and surface-mounting in a tight telecom room can catch integrators off guard.
Deployment Considerations:
- The MAXFIT11FD is indoor-only; tempered equipment room or IDF closet required — do not install in an unheated exterior enclosure or mechanical room that swings below rated temperature.
- Keep total connected load at or below 3.2A per output (80% of 4A rated) for continuous-duty operation — electric strikes cycling all day in a high-traffic entry push that budget faster than most integrators expect.
The MAXFIT11FD is the right call for mid-size commercial access control retrofits where the existing hardware mix spans both voltage standards and the project cannot support a second supply footprint in the panel room.
