Altronix EFLOW4NXV 220VAC Single-Output Power Supply/Charger with FAI

Overview

The Altronix EFLOW4NXV is a 220VAC-input power supply/charger engineered for international and export security deployments where North American 120VAC infrastructure is not available. Converting a 198–256VAC, 50/60Hz input to a selectable 12VDC or 24VDC output at 4A continuous, it packages a supervised battery charger, fire alarm disconnect, overvoltage protection, and LinQ2 network monitoring compatibility into a single wall-mount enclosure — the kind of consolidated BOM that integrators working on commercial access control and surveillance installs in Europe, Latin America, and the Middle East will recognize immediately.

The unit ships complete inside an Altronix BC400 enclosure rated for indoor wall mounting, sized at 12.25"W x 15.5"H x 4.5"D and capable of housing up to two 12V/12AH sealed lead-acid or gel batteries (sold separately). At 8.4 lbs., it installs cleanly in IDF closets, server rooms, or dedicated power rooms without requiring a rack enclosure or secondary housing.

Key Features

• 220VAC Input with Wide Working Range (198–256VAC): The EFLOW4NXV handles real-world international grid variance — the 198–256VAC working range means the unit keeps running even under brown-brown conditions common in developing markets, without requiring a separate line conditioner or AVR upstream.
• Selectable 12VDC or 24VDC Output @ 4A: Output voltage is field-selectable, so the same unit powers 12V access control readers, locks, and cameras or 24V devices like PTZ motors and sirens without ordering a different SKU. Four amps continuous supports meaningful multi-device loads in a compact panel.
• 1A Auxiliary Unswitched Output: The auxiliary rail stays live regardless of the main output state — useful for powering supervisory devices, door contacts, or monitoring modules that must remain energized even during a fire alarm disconnect event on the primary rail.
• Built-In Battery Charger at 1.54A: The integrated charger handles sealed lead-acid and gel batteries up to the enclosure's 2x12AH capacity. At 1.54A charge current, a fully depleted 12AH battery recovers in roughly 8 hours — relevant for sites that need verified standby autonomy after a real power event, not just a nominal rating.
• Instantaneous Automatic Switchover to Battery: Transfer to standby battery is instantaneous with no interruption — critical for access control loads where even a brief DC dropout can trigger a fail-secure lock or reset a controller, creating a security gap or nuisance alarm.
• Low Power Shutdown to Protect Batteries: The unit monitors battery voltage and shuts down DC output terminals when battery voltage drops below 71–73% (12V units) or 70–75% (24V units). This prevents the deep discharge that permanently degrades sealed lead-acid cells — a real operational cost on sites that experience extended outages.
• Supervised Fire Alarm Disconnect (FAI): The FAI circuit supports normally open or normally closed triggers with a 10K EOL resistor, operates in latching or non-latching mode, and integrates directly with fire alarm control panels. Sites that require UL 294 or UL 2050 compliant power supervision at the power supply level will find this pre-wired rather than field-added.
• AC and Battery Supervision via Form-C Contacts: Separate form-C contacts report AC fail and battery fail/presence conditions to a FACP or monitoring system. The AC fail notification trigger is selectable for 30 seconds (factory default) or 2 hours — the 2-hour delay is the right setting for sites where short utility flickers should not generate central station alarms.
• LinQ2 Ready: The EFLOW4NXV is compatible with the Altronix LinQ2 network communication module, which enables remote monitoring, control, and diagnostics of power supply status over IP — relevant for managed security deployments where a technician should not need to be on-site to verify power health after an alarm event.
• NDAA, TAA, BAA, and CE Compliant: All four listings are verified for this SKU. NDAA Section 889 compliance matters for federal, state, and municipal projects with supply chain restrictions. TAA compliance satisfies GSA schedule and government contract requirements. BAA adds Buy American Act qualification for federally funded infrastructure projects.
• Short Circuit and Overload Protection: Onboard protection prevents downstream wiring faults from damaging the supply — no fuse replacement required at the load side for common overcurrent events.

Integration and Compatibility

The EFLOW4NXV integrates directly into the Altronix power distribution ecosystem. The LinQ2 module (sold separately) pairs with this unit and other eFlow-series and MaximalF supplies to give operators centralized IP-based power visibility — a meaningful upgrade for enterprise access control deployments where power supervision is a compliance requirement, not just a convenience. The enclosure's 1.125" and 1.375" combination knockouts accept standard conduit, and the included battery leads and cam lock mean the unit arrives ready to install without sourcing additional hardware.

For integrators specifying access control power supplies on international projects, the EFLOW4NXV sits in the same design workflow as 120VAC-input Altronix supplies — same supervision contacts, same FAI circuit logic, same enclosure family — so teams familiar with domestic Altronix deployments can transition without relearning wiring conventions. Pair it with a compatible access control panel and sealed lead-acid batteries sized to your standby requirement, and the power infrastructure is fully supervised from day one.

When sizing battery backup, use Altronix's published NAC Power Extender Battery/Load Calculator to verify runtime against your connected load. The enclosure supports up to 2x12AH batteries, which at a 4A continuous draw gives roughly 3–4 hours of standby at 12V under typical conditions — confirm against your site's specific load profile before finalizing the design. For a deeper look at how to size backup power for access control and surveillance, review the access control power planning guide.

Frequently Asked Questions

Q: Is the EFLOW4NXV NDAA Section 889 compliant?

A: Yes. The EFLOW4NXV carries verified NDAA compliance, along with TAA, BAA, and CE listings — confirmed in Altronix's published agency listings for this model.

Q: What input voltage does the EFLOW4NXV require?

A: The EFLOW4NXV requires a 220VAC input with a working range of 198–256VAC at 50/60Hz. It is not compatible with standard North American 120VAC circuits without a step-up transformer — this unit is designed for international installations where 220VAC is the local standard.

Q: What type and size batteries does the EFLOW4NXV support?

A: The unit supports sealed lead-acid (SLA) or gel-type batteries. The BC400 enclosure accommodates up to two 12VDC/12AH batteries. Batteries are sold separately.

Q: Can I monitor the EFLOW4NXV remotely over a network?

A: Yes, when paired with the Altronix LinQ2 network communication module (sold separately), the EFLOW4NXV supports remote monitoring, control, and diagnostics over IP. The unit is LinQ2-ready out of the box.

Q: What does the fire alarm disconnect (FAI) feature do?

A: The supervised FAI circuit allows a fire alarm control panel to cut power to connected devices (such as electric locks) when a fire event is detected. It supports normally open or normally closed trigger inputs, latching or non-latching operation, and includes a 10K EOL resistor for supervision. This is a common requirement in access control installations integrated with fire alarm systems.

Q: What is the warranty on the EFLOW4NXV?

A: Altronix provides a Lifetime Warranty on the EFLOW4NXV, as stated on the manufacturer's product page.

Marty Allison

The spec that defines where the EFLOW4NXV belongs in a project is its 220VAC input — and that's not a footnote, it's the whole point. When I'm designing power infrastructure for an international campus deployment or a federal project in a region where 220VAC is the grid standard, the EFLOW4NXV is the unit I reach for in the Altronix eFlow lineup. It handles 198–256VAC across 50/60Hz, which covers real-world grid variance without requiring upstream conditioning hardware that adds cost and failure points.

Technical Highlights:

• Selectable 12/24VDC Output: Field-selectable output voltage at 4A means one SKU covers both 12V reader/lock loads and 24V PTZ or siren circuits — that flexibility reduces the number of line items on a power BOM for mixed-voltage access control panels.
• 1.54A Battery Charging Current: At 1.54A, the integrated charger recovers a 12AH SLA battery in approximately 8 hours — a realistic post-outage recovery window that lets you confirm standby readiness before the next business day without manual intervention.
• Low Power Shutdown Thresholds: The 71–73% voltage cutoff (12V) and 70–75% (24V) thresholds are tuned to prevent the deep-discharge damage that degrades SLA cells permanently. On a site that sees real extended outages, this alone extends battery service life meaningfully.

Deployment Considerations:

• The BC400 enclosure fits two 12V/12AH batteries — size your standby runtime against your actual connected load before finalizing battery selection; at 4A draw, two 12AH cells give roughly 3–4 hours of standby under typical conditions, not the nominal AH math.
• The 220VAC input is a hard requirement — this unit will not operate on a standard North American 120VAC circuit. Confirm site voltage before specifying; mismatched input voltage is a common RMA driver on international supply orders.

The EFLOW4NXV is the right call for international government facilities, embassy-class installations, and export security integrations where NDAA/TAA/BAA compliance is contractually required and 220VAC is the local grid standard — a combination that eliminates both the compliance risk and the need for a separate input transformer in the panel.