Altronix EFLOW3NX4DV 220VAC Power Supply/Charger with Fire Alarm Interface

Overview

The Altronix EFLOW3NX4DV is a selectable 12VDC or 24VDC power supply and battery charger engineered for international and export security installations operating on 220VAC mains. It accepts a working input range of 198VAC to 256VAC at 50/60Hz — accommodating real-world line voltage fluctuations common in international facilities — and converts that input to four independently PTC-protected Class 2 outputs rated at a combined 2A continuous. For integrators deploying access control, intrusion, or camera infrastructure in 220VAC environments, the EFLOW3NX4DV eliminates the need for a step-down transformer while delivering supervision, battery backup, and fire alarm integration from a single wall-mount enclosure.

The unit fits within the Altronix power supply line, which covers a wide range of input voltages and output configurations for commercial security applications. If you are specifying security power supplies for a multi-device access or surveillance installation, it is worth reviewing your PoE switch and camera power budgets alongside this unit to align distribution architecture before committing to a layout.

Key Features

• Selectable 12VDC or 24VDC Output: A single unit serves both 12V and 24V device ecosystems — door controllers, magnetic locks, and cameras often differ in supply voltage, and voltage selectability means you stock one SKU rather than two. Output is rated at 2A total across all four channels.
• Four PTC-Protected Class 2 Outputs: Each output uses a self-resetting PTC (Positive Temperature Coefficient) overcurrent device. When a downstream short or overload clears, the output automatically resets without a technician visit — a meaningful operational advantage on remote or high-headcount sites where a blown fuse means a service call.
• 220VAC Input with Wide Working Range (198–256VAC): Designed for international infrastructure. The ±28V tolerance above and below nominal handles the line sag and swell common in industrial facilities and older commercial buildings outside North America without nuisance tripping or damage to downstream devices.
• Built-In Battery Charger with Instantaneous Failover: The integrated charger supports sealed lead acid or gel-type batteries up to 2 × 12VDC/12AH (accommodated in the enclosure). Maximum charge current is 1.54A. Switchover to battery on AC loss is instantaneous with no output interruption — critical for access control applications where a momentary dropout can unlatch a door or trigger an alarm.
• Fire Alarm Interface (FAI): Supervised fire alarm disconnect supports latching or non-latching operation with a 10K EOL resistor. It triggers on normally open or normally closed contact — compatible with the majority of fire panel output configurations. This means the power supply can legally cut power to electromagnetic locks on a fire event without a separate relay module, reducing panel complexity and panel real estate.
• AC Fail Supervision with Selectable Delay: Form C contacts report AC loss at either 30 seconds (factory default) or 2 hours. The 2-hour delay option suppresses nuisance alarms from brief utility interruptions at sites where short outages are routine — select the threshold that matches your monitoring center's SLA.
• Battery Supervision and Low-Power Shutdown: Form C contacts report battery fail and presence independently from AC status. The low-power shutdown engages when battery voltage drops to 71–73% of nominal (12V units) or 70–75% (24V units), preventing deep discharge that permanently degrades battery capacity over successive outages.
• Auxiliary Output: An unswitched 1A auxiliary output is available for powering ancillary devices (keypads, readers, small peripherals) that should remain powered regardless of the main output state.
• NDAA and TAA Compliant: The EFLOW3NX4DV carries NDAA Section 889 and TAA compliance listings alongside CE and BAA — qualifies for federal, state, and government-funded installations where supply chain provenance is a procurement requirement.
• LinQ2 Ready: Compatible with the Altronix LINQ2 network communication module, which enables remote monitoring, control, and diagnostics of power supply status over IP — useful for centralized facilities management or MSP-managed security programs where site visits for status checks are cost-prohibitive.

Integration and Compatibility

The EFLOW3NX4DV mounts inside the included BC400 wall-mount enclosure, which provides 1.125" and 1.375" combination knockouts for conduit entry and internal space for up to two 12VDC/12AH sealed batteries (sold separately). The enclosure is rated for indoor use only — do not install in unheated mechanical rooms or exterior equipment closets where ambient temperature can fall below 0°C or exceed 49°C.

For larger deployments requiring more output channels or higher current capacity, review the broader access control power supply category — higher-current Altronix eFlow variants exist for installations with heavier lock or reader loads. If your project specifies PoE network switches alongside this unit, confirm that camera or VoIP devices on the same distribution panel are not also drawing from this supply; mixing managed PoE loads with this unit's DC outputs on the same battery bank adds complexity to the UPS sizing calculation.

The LinQ2 accessory module (sold separately) connects via the dedicated header and reports diagnostics including AC voltage, DC output voltage, battery voltage, and fault conditions through Altronix's LINQ management platform — a practical addition for government facilities or enterprise campuses running centralized physical security monitoring.

Frequently Asked Questions

Q: Is the EFLOW3NX4DV NDAA Section 889 compliant?

A: Yes. The EFLOW3NX4DV carries verified NDAA compliance, along with TAA, CE, and BAA listings. It qualifies for federal and government-funded installations with supply chain compliance requirements.

Q: What battery types and sizes does the EFLOW3NX4DV support?

A: The built-in charger is designed for sealed lead acid or gel-type batteries. The BC400 enclosure accommodates up to two 12VDC/12AH batteries. Batteries are sold separately. Maximum charge current is 1.54A.

Q: What happens to the outputs when AC power fails?

A: Switchover to standby battery is instantaneous with no interruption to DC outputs. AC fail supervision contacts (Form C) trigger after either 30 seconds or 2 hours, depending on the selected delay setting.

Q: Can the EFLOW3NX4DV interface with a fire alarm panel?

A: Yes. The unit includes a supervised fire alarm interface (FAI) supporting latching or non-latching operation, normally open or normally closed trigger, with a 10K EOL resistor — compatible with standard fire panel output configurations.

Q: What is the warranty on the EFLOW3NX4DV?

A: Altronix provides a lifetime warranty on the EFLOW3NX4DV, as listed on the manufacturer's product page.

Q: What is the operating temperature range, and is this unit suitable for outdoor or unheated spaces?

A: The operating temperature range is 0°C to 49°C (32°F to 120°F). The enclosure is rated for indoor use only. Do not install in locations where ambient temperature falls outside this range.

Ted Perry

When I see a specification calling for electromagnetic locks, REX devices, and card readers all on a single 220VAC branch in an international facility, the EFLOW3NX4DV is typically the unit I reach for first. The 198–256VAC working range is the detail that matters — not all 220V supplies handle real-world line fluctuations gracefully, and a supply that nuisance-trips on voltage sag causes more headaches than a battery failure.

Technical Highlights:

• PTC Auto-Reset Protection: Four self-resetting PTC outputs mean a downstream short on one channel clears without requiring a technician to swap a fuse — on a 24/7 access-controlled facility with remote monitoring, that distinction between a reset and a service call is a real operational cost difference.
• 1.54A Charge Current with Deep-Discharge Protection: The charger tops off two 12AH batteries at 1.54A while the low-power shutdown at 71–73% of nominal prevents the cycle degradation that kills batteries prematurely — a detail that matters on a 3–5 year battery replacement budget.
• NDAA + TAA + BAA Compliance: All three compliance listings on a single power supply SKU simplifies procurement documentation for government and education projects where each compliance flag requires individual verification.

Deployment Considerations:

• Batteries are not included. Size your battery bank against the total load current and required backup duration before ordering — the enclosure fits 2 × 12AH, but if your load budget pushes runtime requirements above what 24AH can deliver, plan for an external battery expansion chassis from the Altronix line.
• The 2A total output ceiling across all four channels is a hard limit — if your device list (locks, readers, REX sensors, door position switches) totals more than 2A at 12V or 24V, you will need a higher-current variant or a second supply. Run your load calculation before committing this unit to a multi-door panel.

The EFLOW3NX4DV is the right fit for single- or dual-door access control installations in international facilities, government buildings, or export projects where 220VAC is the standard input, fire alarm integration is a code requirement, and remote power monitoring via LinQ2 is part of the managed services scope.