Altronix AL602ADA220 4-Zone NAC Power Supply with Sync, 220VAC Input
Overview
The Altronix AL602ADA220 is a 24VDC notification appliance circuit (NAC) power supply engineered for fire alarm and life-safety notification systems running on 220VAC infrastructure. Delivering up to 6.5A total output across four Class B or two Class A circuits — with synchronized strobe control built in — the AL602ADA220 fills a specific and non-negotiable gap: facilities with 220VAC mains that need UL-listed NAC power expansion without a separate sync module or step-down transformer. If your project is specifying a fire panel power extender for an international site, a building with 220V service, or a retrofit where the existing panel can't drive enough notification appliance current, this is the unit to evaluate.
The enclosure measures 15.5" x 12" x 4.5" and weighs 9.6 lb — sized to accommodate both the electronics and a sealed lead-acid or gel-type standby battery, which installs inside the cabinet for a self-contained, code-ready assembly. Operating temperature range spans 0°C to 49°C, covering virtually all conditioned mechanical and electrical room environments where fire alarm equipment lives.
Key Features
- 220VAC / 50–60 Hz Input: Native 220VAC operation at 1.2A draw means no step-down transformer is required on international or dual-voltage facilities — a direct wiring connection to the panel or transformer tap, with no added failure point or heat source in the cabinet.
- 6.5A Total Output at 24VDC: The aggregate output capacity supports larger notification appliance loads than most panel-integral NAC circuits, which typically top out at 3A. This matters when a single floor plate or zone requires 20+ strobes or horn-strobes running simultaneously during an alarm event.
- 2.5A Per Output Circuit: Each of the four outputs is individually rated at 2.5A, letting you balance zone loads precisely — useful when notification appliance circuits serve areas with different device densities, so one heavy zone doesn't starve an adjacent lighter one.
- Four Class B or Two Class A Output Circuits: Class B wiring covers the majority of commercial NAC installations and halves your conductor run cost per zone. Class A configuration (two circuits) adds supervised loop-return paths — required in occupancies where a single-wire fault cannot be permitted to silence an entire notification zone.
- Built-In Strobe Synchronization: Synchronized strobes are an ADA requirement in most commercial and public occupancy types — unsynchronized strobes in the same field of view can trigger photosensitive seizures. Having sync built into the power supply eliminates the sync module line item and avoids field-programming compatibility issues between the module and the appliances.
- 1A Auxiliary Output: The 1A auxiliary current output provides supervised power for ancillary devices — door holders, remote indicators, or relay modules — without requiring a separate power supply run for low-current accessories on the same riser.
- Battery Backup Compatibility: Accepts sealed lead-acid or gel-type batteries inside the enclosure. The battery type flexibility matters for sites that standardize on gel batteries (no off-gassing, appropriate for occupied electrical rooms) — you're not locked into a single chemistry.
- 31 BTU/Hr Heat Dissipation: At full load the unit produces only 31 BTU/Hr, low enough that thermal load calculations for the enclosure's room or electrical closet will not require supplemental ventilation in nearly all standard installations.
- Storage Temperature to 70°C: The –20°C to 70°C storage range means the unit can ship to or be staged in an unconditioned warehouse or loading dock without risk of component damage before installation — a practical detail on phased construction projects.
Integration & Compatibility
The AL602ADA220 functions as a NAC power extender — it receives a trigger signal from the fire alarm control panel (FACP) and drives notification appliances on its output circuits independently of the panel's internal NAC capacity. Compatibility depends on the FACP's output signal type and voltage; verify with your panel documentation that the trigger interface matches Altronix's input requirements. The unit is not a standalone fire alarm control panel and does not perform detection, initiating device supervision, or annunciation functions.
Strobe synchronization is compatible with notification appliances that accept the Altronix sync protocol — confirm appliance compatibility before mixing manufacturers on the same circuit. For Altronix power supply products designed for North American 120VAC infrastructure, refer to the broader fire alarm power supplies category for alternative models. Integrators sourcing life-safety power for panel expansion should also review our access control power supplies section for related Altronix product families.
Battery standby calculations should be performed per NFPA 72 requirements for the occupancy type — the AL602ADA220 cabinet accommodates the battery internally, but battery Ah sizing must be specified by the designer based on load and required standby duration.
Frequently Asked Questions
Q: What input voltage does the AL602ADA220 require?
A: The AL602ADA220 is designed for 220VAC input at 50/60 Hz, drawing 1.2A. It is not a dual-voltage unit — confirm your facility provides 220VAC before ordering.
Q: How many NAC circuits does the AL602ADA220 support, and can they be wired Class A?
A: The unit supports four Class B output circuits or two Class A output circuits. Class A wiring provides a supervised return path so a single open or ground fault will not silence an entire zone — required in some occupancy types per NFPA 72.
Q: Does the AL602ADA220 include strobe synchronization, or is a separate sync module required?
A: Strobe synchronization is built into the AL602ADA220 — no external sync module is needed. This keeps the installation cleaner and eliminates the compatibility variables that come with add-on sync modules.
Q: What battery types are compatible with the AL602ADA220?
A: The unit accepts sealed lead-acid or gel-type batteries installed inside the enclosure. Gel batteries are a common choice for occupied electrical rooms because they produce no off-gassing under normal charge conditions.
Q: What is the maximum output current per circuit on the AL602ADA220?
A: Each output circuit is rated at 2.5A, with a total aggregate output of 6.5A across all circuits. Plan your zone device loads so no single circuit exceeds 2.5A, and verify total load stays within the 6.5A aggregate ceiling.
Q: Can the AL602ADA220 power ancillary devices beyond the NAC appliances?
A: Yes — the unit provides a 1A auxiliary output for supplemental devices such as door holders, remote indicators, or relay modules, reducing the need for a separate low-current power supply on the same riser.
The AL602ADA220 comes up in projects I'm involved with specifically because of the 220VAC input — not because 220V fire alarm power supplies are exotic, but because engineers sometimes spec the 120V variant and only catch the voltage mismatch during the electrical rough-in. With 6.5A aggregate output and four Class B circuits, this unit has enough headroom for a mid-sized floor notification load without chaining multiple supplies, and the integrated sync means you're not adding a sync module to the BOM for ADA strobe compliance.
Technical Highlights:
- 6.5A Aggregate / 2.5A Per Circuit: At 2.5A per output, each circuit can drive a substantial appliance load — roughly 10–15 horn-strobes depending on device current draw. The 6.5A aggregate ceiling is the number to watch during load calculations; four circuits at 2.5A each would exceed it, so balancing zone loads is mandatory, not optional.
- Built-In NAC Sync: Synchronized strobe output is included without a separate module. On projects where the panel manufacturer's sync module costs $150–$300 and requires firmware matching, having sync native to the power supply simplifies procurement and reduces field troubleshooting variables.
- 31 BTU/Hr at Full Load: Thermal load is genuinely low for a 6.5A supply — this unit won't drive electrical room cooling requirements on its own, which matters when the mechanical engineer is already tight on BTU budget for the space.
Deployment Considerations:
- Battery sizing is not included — the enclosure accommodates a sealed lead-acid or gel battery internally, but the Ah rating must be calculated by the designer per NFPA 72 standby duration requirements for the occupancy. Don't assume a battery is in the box.
- Strobe sync is Altronix protocol — verify that your specified notification appliances (horn-strobes, strobes) are listed as compatible with Altronix sync before committing to mixed-manufacturer appliance specs on the same circuit.
The AL602ADA220 is the right call for 220VAC-service buildings — international facilities, older industrial sites, or any project where the electrical infrastructure is 220V and the alternative would require a transformer just to feed a NAC extender. It's a clean, self-contained solution for those specific conditions; it's not the unit to reach for on a standard North American 120VAC commercial job.
