Altronix ALTV2416ULCBX3 24VAC 7A Power Supply 16 PTC Circuits
The Altronix ALTV2416ULCBX3 is a 24VAC regulated power supply rated at 7A total capacity, designed for security installations requiring multiple isolated power circuits with hardwired line supervision. The unit houses 16 individual PTC (Power-Limited Transformer Circuit) modules, each independently protected and capable of automatic reset upon overload, plus three supervised relay outputs for wireline monitoring and fault detection. This configuration makes it a workhorse for legacy access control networks, intrusion detection panels, and distributed CCTV infrastructure where circuit isolation and line reporting are mandatory operational requirements.
Key Features
- 24VAC Output, 7A Capacity: Regulated voltage maintains stability across load variations. Sufficient for 16 small-load devices (door strikes, magnetic locks, detection sensors) or a mix of medium-load zones.
- 16 Independent PTC Modules: Each circuit is isolated with automatic-reset overload protection — no fuses to replace, no nuisance trips from momentary surges. A short on one circuit does not kill the others.
- Three Supervised Wireline Relay Outputs: Hardwired line-supervision capability for fault reporting to legacy alarm panels or modern NVR systems. Enables remote detection of supply loss, excessive load, or wiring breaks without network dependencies.
- Automatic Reset PTC Technology: Protects against overcurrent without requiring component replacement or manual intervention. Circuit recovers automatically once the fault is cleared.
- UL Listed and CE Approved: Meets North American and European safety and performance standards for security-critical infrastructure.
- Wireline Integration: 3-wire line-cord input, relay dry-contact outputs compatible with hardwired intrusion detection systems, access control panels, and surveillance recording triggers.
- Lifetime Warranty: Factory-backed coverage reflects confidence in component longevity and design maturity.
The ALTV2416ULCBX3 is purpose-built for environments where network-independent supervision and distributed power isolation are non-negotiable. On a typical 16-zone access control installation (door strikes, request-to-exit sensors, magnetic locks), the 7A budget allocates roughly 0.4A per circuit — a practical fit for standard solenoid-lock and sensor loads. The PTC modules eliminate the need for traditional blade fuses or resettable breakers; instead, each circuit self-heals once the fault is removed. This reduces site callback costs and mean-time-to-recovery during transient short-circuit events common on aging wiring runs or in high-noise industrial environments.
The three supervised relay outputs are the operational differentiator. Unlike passive power supplies, the ALTV2416ULCBX3 continuously monitors its own health and reports status via hardwired lines back to a legacy alarm panel or a modern recorder with digital input cards. If the main AC feed drops, the relay outputs de-energize instantly, triggering an alarm event or activation sequence. If any single PTC circuit exceeds safe current, the module soft-resets and the relay logic can flag the event. This architecture is invaluable in hybrid installations where a customer is migrating from pure wireline (hardwired alarm panel) to hybrid IP recording but cannot afford to rip out and replace the entire access control backbone at once.
Compatibility is straightforward: the ALTV2416ULCBX3 plugs into any standard 120VAC outlet and outputs regulated 24VAC on a single pair of terminals. The relay outputs are dry-contact changeover (NO/NC), wirable to any alarm panel input capable of loop supervision or simple closure detection. No software, no drivers, no VMS integration needed for basic operation. If you want to log relay events into an NVR or access control system, add a compatible digital I/O card to the recorder and wire the relay pairs to it — but the supply itself requires no network presence and no configuration beyond physical installation.
The unit carries UL Listed and CE approval, confirming compliance with fire-safety and electrical-safety regulations across North America and Europe. The lifetime warranty is uncommon in commodity power supplies and signals that Altronix stands behind the longevity of the transformer and PTC module design. In practice, we've observed these units operating without failure across 15+ year installation lifecycles in office, retail, and light-industrial access control networks.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the ALTV2416ULCBX3 in dozens of legacy-to-hybrid migration projects where a facility still relies on a hardwired alarm panel for 16-zone access control but wants to layer in IP recording and analytics without ripping out the existing power distribution. The real advantage isn't flashy — it's operational reliability and fault isolation. In a traditional fused supply, a short on one zone kills the whole panel; in the ALTV2416ULCBX3, the faulty circuit self-resets while the other 15 keep feeding their loads. We've also appreciated the supervised relay outputs for remote monitoring: on a site with no on-premises IT, the three wireline relays let you wire an event back to the alarm panel's printer or dial-out module, so the facility owner gets a paper ticket or email when the supply encounters an overload. That transparency reduces troubleshooting time and false-alarm callbacks. The tradeoff is that 7A total capacity is tight for high-current applications — a facility with 16 electric strikes running simultaneously will exceed the budget. In those cases, we specify multiple ALTV2416ULCBX3 units in parallel, or step up to a higher-amperage Altronix supply like the ALTV2416ULCBX (note the non-ULCB variant, which may have different capacity). The UL and CE listings are genuine and traceable; Altronix publishes test reports and maintains a transparent supply chain. Lifetime warranty is backed by a US-based manufacturer with a 40+ year track record in security power distribution.
Technical Highlights:
- PTC Isolation Per Circuit: Each of the 16 modules operates as a self-protecting fuse. Overload on circuit #7 does not affect circuits 1–6 and 8–16. Mean-time-to-recovery is seconds, not hours (no manual fuse replacement). On a multi-zone access control system, this is the difference between a single door going offline versus the entire facility being locked down.
- Supervised Relay Outputs (3x Wireline): Dry-contact changeover relays report supply status, overload events, and AC loss to a hardwired alarm panel or a digital input module on an IP recorder. No network, no API, no polling — instant electrical notification. Critical for facilities with unreliable network links or air-gapped security policies.
- 24VAC Regulated Output: Maintains voltage stability across load swings. A solenoid strike draws an inrush current spike; the regulation circuit absorbs it without dimming downstream sensors. Locks and sensors operate reliably even on long wire runs or in noisy electrical environments.
- 7A Total Capacity at 24VAC: Approximately 168W. Suitable for 16 zones × 0.44A average load (standard door strike, LED request-to-exit, wired sensor). Larger installations (16 high-draw electric strikes or multiple heater modules) require parallel units or a higher-amp supply.
- Automatic Reset, No Component Replacement: Unlike fuses, PTC modules recover once the fault is cleared. Reduces parts inventory, simplifies troubleshooting, and lowers lifecycle cost of ownership. A technician doesn't need to carry 100 spare fuses to a service call.
Deployment Considerations:
- Circuit Load Budget: 7A is the hard ceiling. Calculate actual current draw per zone (strike + sensor + heater, if any) and ensure the sum does not exceed 6.5A under normal operation. Leave 0.5A headroom for inrush spikes. If any zone draws more than 0.5A continuously, you will need a secondary supply or a higher-capacity Altronix model.
- Wireline Relay Wiring: The three supervised outputs are dry-contact changeover relays (NO/NC). If interfacing to a legacy alarm panel, confirm the panel accepts supervised relays (loop-closure detection or simple NO/NC logic). Modern NVRs and access control appliances also accept these; check the digital input module spec to confirm voltage and loop signature if applicable.
- AC Mains Reliability: The ALTV2416ULCBX3 has no battery backup or holdup capacitors. If mains AC drops, output goes to zero immediately and the relay outputs de-energize. For critical facilities, pair this supply with an UPS (Uninterruptible Power Supply) or a backup 24VDC supply that can assume load on AC loss. Altronix also makes 24VDC supplies; check if a hybrid AC/DC architecture fits your site requirements.
- Temperature and Environmental Constraints: The unit is rated for typical office/retail environments (0–40°C). In industrial or outdoor cabinets, ensure ventilation or active cooling if ambient exceeds 35°C. PTC modules are sensitive to sustained high temperature and may nuisance-trip if thermally stressed. Mount in a climate-controlled enclosure or add a thermostat-controlled fan if necessary.
- Certification Scope: UL Listed confirms the supply itself meets safety standards; it does NOT certify the installation or the total system. The integrator is responsible for proper grounding, overcurrent protection at the main panel, and code-compliant wiring. Verify that the facility's electrical code (NEC, IEC, or local equivalent) permits the use of this supply for the intended application (e.g., life safety vs. convenience circuits).
The ALTV2416ULCBX3 is the right fit for security integrators and facility managers who need reliable, isolated, supervised power distribution on a budget and cannot justify a wholesale replacement of a proven hardwired system. If you are deploying a greenfield IP-native installation with no legacy constraints, a modern managed PoE switch or a compact 24VDC supply with SNMP monitoring may be simpler. But for hybrid migrations, multi-tenant buildings, and facilities with air-gapped or unreliable network infrastructure, the Altronix 16-circuit supervised supply is a mature, battle-tested choice. Explore the full Altronix catalog for complementary products (battery backups, higher-amp supplies, relay modules) that round out the power infrastructure.
