Altronix MAXFIT33FEV 12/24VDC Dual Expandable Power Supply

Overview

The Altronix MAXFIT33FEV is a dual-output, field-expandable power supply engineered for commercial surveillance and access control installations where uninterrupted power and scalability are non-negotiable. Rated at 12/24VDC at 12A continuous output with 220V input compatibility, the MAXFIT33FEV is purpose-built for deployments that demand stable, protected DC power across multiple devices — from cameras and NVRs to access control panels and door hardware.

This unit slots into Altronix's MAXFIT enclosure ecosystem, which means you can grow capacity without replacing your existing hardware. If you're planning a phased deployment or need room to add devices over time, the expandable architecture pays off immediately. Explore the full Altronix power supply lineup to find compatible enclosures and expansion modules.

Key Features

• 12/24VDC @ 12A Dual Output: A 12-amp continuous rating means you can power a substantial device load — multiple cameras, readers, and control boards — off a single supply without risking brownout conditions. Dual voltage selection (12V or 24V) handles mixed-voltage device mixes in the same enclosure without requiring a second supply.
• 220V Input Compatibility: Accepts 220VAC input, making this unit viable in international deployments and industrial facilities where 220V branch circuits are standard. This eliminates the need for a step-down transformer in those environments.
• Electronic Output Protection: Built-in electronic protection guards against overcurrent and output faults. In a multi-device installation, a shorted cable or failed device won't cascade into a full system failure — the protection circuit responds before damage propagates.
• 4 × 12VDC/12AH Battery Support: The MAXFIT33FEV supports up to four 12VDC/12AH batteries in its expandable chassis. That's a substantial UPS reserve — in a typical 3A average-load scenario, you're looking at meaningful runtime through power outages, which is exactly what you need in an access control or surveillance application where loss of power means loss of security.
• Built-in Battery Charger (30–50% Faster): The integrated charger runs 30–50% faster than conventional trickle designs, which matters in facilities where power interruptions are frequent. A faster recharge cycle means your battery reserve is restored and ready for the next event sooner — not sitting at partial capacity for hours.
• 1A Auxiliary Output: The dedicated 1A auxiliary output provides a clean secondary branch for lower-draw devices — think keypads, REX sensors, or status indicators — without pulling from the main 12A bus. Separating sensitive control circuitry from high-current device feeds is a sound practice that reduces noise-related issues.
• MAXFIT Expandable Architecture: Designed for Altronix's MAXFIT enclosure system, this supply integrates with expansion modules to scale output capacity as the installation grows. You're not locked into a fixed power envelope at install time.

Integration & Compatibility

The MAXFIT33FEV is designed to integrate within the Altronix MAXFIT modular enclosure platform, making it compatible with Altronix expansion boards and accessories designed for that ecosystem. The dual 12/24VDC output supports a wide range of commercial access control hardware, electric locks, and surveillance cameras — particularly in installations where devices operate at mixed voltages. If you are planning a centralized power distribution layout, pairing this supply with a multi-output distribution module keeps wiring organized and fault-isolated. For large installations requiring full power budget planning, consult a PoE and power planning resource to calculate total current draw before sizing your supply count.

The 220V input makes this supply a direct fit for facilities using industrial or international branch circuits. Standard 120VAC environments will require a different model in the MAXFIT family — confirm your local input voltage before ordering.

Frequently Asked Questions

Q: What input voltage does the MAXFIT33FEV require?

A: The MAXFIT33FEV is designed for 220VAC input. If your facility runs standard North American 120VAC circuits, you'll need to select a different model in the Altronix MAXFIT series that matches your input voltage.

Q: How many batteries does the MAXFIT33FEV support?

A: The MAXFIT33FEV supports up to four 12VDC/12AH batteries for standby backup power. The built-in charger recharges the battery bank 30–50% faster than conventional designs, reducing recovery time after an outage.

Q: Can the MAXFIT33FEV supply both 12V and 24V devices simultaneously?

A: Yes. The dual-output design provides selectable 12VDC and 24VDC at up to 12A, making it suitable for mixed-voltage device installations such as access control panels paired with 24V door hardware.

Q: What is the purpose of the 1A auxiliary output?

A: The auxiliary output provides a dedicated 1A branch for lower-draw devices such as keypads, REX sensors, or status LEDs — keeping these control-circuit devices electrically separated from the main high-current output bus to reduce noise and improve reliability.

Q: Is the MAXFIT33FEV compatible with Altronix expansion modules?

A: Yes. The MAXFIT33FEV is designed for the Altronix MAXFIT enclosure platform, which supports expansion boards and distribution modules for scaling output capacity across larger installations.

Q: Does the MAXFIT33FEV include output protection?

A: Yes. The unit features electronic output protection to guard against overcurrent and fault conditions, preventing a single shorted device from taking down the entire power distribution bus.

Eden Phillips

The MAXFIT33FEV sits in a specific niche: installations where you need a 220VAC-input supply with a serious battery reserve — four 12AH batteries — and room to expand without ripping out the power infrastructure. At 12A continuous output across dual 12/24VDC rails, it's sized for mid-to-large access control and surveillance builds, not a two-camera closet install.

Technical Highlights:

• 4 × 12VDC/12AH Battery Capacity: That's up to 48AH of reserve at 12V. In a lightly loaded system, you're looking at hours of runtime through a power event — not minutes. Size your battery runtime against your actual draw to confirm, but this headroom is substantial for commercial standby requirements.
• 30–50% Faster Charging: The integrated charger's accelerated recharge rate is meaningful in facilities with frequent power interruptions. Conventional trickle chargers can leave you underprotected during a second outage if the batteries haven't fully recovered from the first.
• Electronic Output Protection: Fault isolation at the output level means a wiring problem on one branch doesn't cascade. In multi-device panels this is the difference between a service call for one device versus an entire system reset.

Deployment Considerations:

• Confirm your branch circuit delivers 220VAC before installing — this supply is not designed for 120VAC input. Wiring a 120VAC feed into a 220VAC supply is a commissioning mistake that's easy to avoid and costly to fix after the fact.
• Battery quantity and capacity directly affect your UPS runtime; plan your total device current draw before assuming the four-battery configuration meets your hold-up time requirement. The 12AH per battery figure is the starting point, not a guarantee of runtime.

The MAXFIT33FEV is the right call for a 220VAC industrial facility or international deployment running a mid-size access control and camera installation — specifically where phased expansion and battery backup depth are design requirements, not afterthoughts.