Altronix PD4ULCB 4-Output Power Distribution Module
The Altronix PD4ULCB is a compact power distribution module engineered for centralized voltage management in 28VAC/VDC security infrastructure. It provides four independent outputs, allowing a single 28V power source to serve multiple downstream devices — locks, readers, power supplies, and auxiliary equipment — without requiring separate feeder runs or additional infrastructure. This reduces wiring complexity and labor cost in multi-door access control systems and distributed surveillance deployments.
Key Features
- 4 Independent Outputs: Each output is isolated and capable of handling 28VAC or 28VDC loads independently, so a single failed device won't cascade to others. This redundancy in distribution improves uptime across the system.
- AC/DC Voltage Support: The PD4ULCB accepts both alternating current (28VAC) and direct current (28VDC) inputs, making it compatible with both transformer-based and regulated DC power infrastructure. This flexibility simplifies retrofit scenarios where power source type may vary.
- Compact Form Factor: Designed for integration into existing control rooms, panel enclosures, or wall-mounted cabinet installations. Its small footprint saves valuable rack and shelf space in cramped equipment rooms.
- Industrial-Grade Construction: Built for security applications where reliability matters. The module is rated for continuous operation in the controlled environments typical of data centers, wiring closets, and security operations centers.
- Voltage Splitting for Multi-Device Loads: Consolidates multiple 28V feeder lines into a single distribution point, simplifying circuit management and reducing the conductor count you must pull through conduit or cable trays.
- Lifetime Limited Warranty: Altronix backs the unit with comprehensive warranty coverage, reflecting confidence in component longevity and reducing long-term ownership risk in critical infrastructure.
Integration & Compatibility
The PD4ULCB integrates into any 28VAC or 28VDC power architecture — whether powering magnetic locks, card readers, relay modules, auxiliary power supplies, or surveillance equipment transformers. It is commonly deployed in:
- Multi-door access control systems where a central 28V supply feeds four separate door control zones
- Surveillance installations requiring distributed 28V for electric strikes, pan-tilt-zoom motor controllers, or auxiliary relay panels
- Security system peripheral management, where multiple low-current devices (motion sensors, door contacts, alarm relays) share a single high-capacity power feed
- Control room consolidation, centralizing all 28V distribution in one module rather than wiring individual branches from the source
When evaluating the PD4ULCB, confirm your input voltage matches (28VAC or 28VDC) and that downstream load currents per output remain within Altronix specifications. Load coordination with the source transformer or regulated supply is a pre-installation step — pair this module with an appropriately sized upstream power supply to avoid voltage sag under peak demand.
Frequently Asked Questions
Q: Can I mix 28VAC and 28VDC loads across the same PD4ULCB?
A: No. The module operates as either 28VAC or 28VDC. Your input voltage type (AC or DC) determines the output type. Select your input source accordingly.
Q: What is the maximum current per output?
A: Consult the PD4ULCB datasheet for per-channel current specifications and total input current. Load sizing is critical to avoid voltage drop and equipment shutdown during peak demand.
Q: Does the PD4ULCB require a separate power supply or transformer?
A: Yes. The PD4ULCB is a distribution module only. You must provide a 28VAC transformer or 28VDC regulated supply upstream. The module splits that power across four outputs.
Q: Is this suitable for outdoor or wet-location installations?
A: The PD4ULCB is designed for controlled indoor environments (control rooms, wiring closets, equipment racks). For outdoor or damp locations, mount it inside a weatherproof enclosure and run conduit to field devices.
Q: Can the PD4ULCB be installed vertically or horizontally?
A: Yes. The compact module can be wall-mounted or installed inside a panel enclosure. Ensure adequate ventilation and clearance for terminal connections.
Q: What warranty coverage does Altronix provide?
A: The PD4ULCB includes a Lifetime Limited Warranty, covering defects in materials and workmanship.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Altronix PD4ULCB solves a real wiring problem in multi-device security deployments: running a single high-capacity 28V feeder line and then splitting it at the control point rather than pulling four separate runs from the source. In access control and surveillance work, that's a labor and material win, especially in retrofit scenarios where conduit or cable tray space is already constrained.
Technical Highlights:
- 4 Independent Outputs: Each output is isolated from the others, so a short or overload on one branch won't trip the entire distribution module. Critical for multi-door systems where a single failed lock or reader shouldn't crash the whole facility.
- AC/DC Compatibility: Accepts 28VAC or 28VDC input — important because legacy installations often use AC transformers, while new builds may run regulated DC. The PD4ULCB doesn't force you into one architecture.
- Compact Footprint: Saves rack and shelf space in crowded control rooms and wiring closets. You can mount it vertically in a panel enclosure or wall-mount it for easy field access.
Deployment Considerations:
- Input Sizing: Don't overlook upstream power supply capacity. A 28V transformer or regulated supply must be sized for the peak total current across all four outputs. Undersizing here causes voltage sag and intermittent device failures that are hell to diagnose.
- Indoor Only: The PD4ULCB is built for control rooms and equipment racks. If you need distribution in outdoor cabinets or damp locations, mount it inside a weatherproof enclosure and run conduit to your field devices.
The PD4ULCB is the right call for centralized 28V distribution in multi-door access control systems and surveillance installations where you want to reduce feeder line count and simplify circuit management without investing in a full power distribution unit.
