The Command Access Technologies PS440B is a regulated 24VDC linear power supply with battery-backup capability, engineered for electrified commercial door hardware and access-control systems. It provides 4A continuous combined output plus a 6A short-duration boost at a 20% duty cycle to handle the initial inrush requirements of compatible solenoid and motor-driven latch-retraction devices. Four independent solid-state control inputs operate four individually protected outputs.

Four-Output Supply and Battery Planning

The PS440B distributes regulated 24VDC power from a 4A combined continuous source across four protected output channels. Its specified 6A boost function is intended for approved short-duration demand, not continuous loading. Each channel does not provide an independent 4A budget.

Before Ordering and Installing

• Calculate aggregate current for all connected locks, solenoids, relays and controllers, including simultaneous operation and cable voltage drop.
• Confirm branch/output protection, source power, terminal diagrams and any fire-alarm interface requirements against the manufacturer's current wiring instructions.
• For battery backup, verify supported battery type, capacity, quantity, charger requirements and anticipated standby time; backup batteries are not included by default.
• Ensure enclosure access, heat clearance, service wiring, separation and listing requirements are met, then test each output under actual operating conditions.

PS440B battery-backup version: A built-in independent, regulated battery charger and automatic uninterrupted backup circuit support standby operation. The enclosure accommodates two 12VDC 7Ah batteries (not included), and battery connection cables are supplied. This is the four-output PS440B; the separate PS480B model provides eight outputs.

Key Features and Benefits

• Regulated 24VDC linear power: 4A continuous combined output, designed for compatible electrified locks, electric strikes, maglocks and exit devices.
• 6A surge capability: Short-duration boost at 20% duty cycle for compatible motorized and solenoid latch-pullback hardware.
• Four independent control channels: Four normally-open dry-contact-triggered solid-state inputs and four matching 24VDC outputs.
• Individually protected circuits: Four auto-resetting 1.5A PTC-fused outputs; total continuous demand across all outputs must not exceed 4A.
• Integrated battery backup: Automatic uninterrupted backup transfer, independent battery charging and included battery connection cables; two batteries are required but sold separately.
• Fire-alarm link: Connection for approved fire-alarm and access-control safety integration.
• Solid-state relay protection: Over-voltage protection and circuit design intended to protect connected control relays from shorts, grounds and surges.
• Easy maintenance: Removable Euro-style wire connectors, output-voltage adjustment and red/green/orange diagnostic indicators.
• Commercial-grade metal cabinet: 13" wide x 15-1/2" high x 5" deep, with 1/2" and 3/4" knockouts on all sides and a removable hingeless cover.
• Safety listing: Identified in manufacturer documentation as UL 294 Sixth Edition and Class 2 power-limited.

Product Specifications

Common Commercial Applications

• Up to four separately triggered circuits for compatible electric locks, mortise locks and cylindrical locksets
• Compatible 24VDC motor-driven and solenoid-operated latch-retraction panic or exit devices
• Commercial electric strikes, electrified exit trim and magnetic locks
• Door access-control systems requiring a regulated power source and battery-backup support
• Institutional, industrial, medical, educational and commercial-building openings

What's Included

One Command Access PS440B 24VDC 4A linear power supply installed in a large metal enclosure, with four independently triggered protected outputs, fire-alarm link, integrated battery charger, automatic backup circuitry and battery connection cables.

Not Included / Installation Notes

Two 12VDC 7Ah backup batteries are required for standby operation and are not included. Electric locks, exit devices, access-control panels, field wiring, conduit, cam lock and installation labor are also sold separately. Verify actual connected loads, 1.5A per-output protection, 4A total continuous capacity, surge duty cycle, battery runtime, fire-alarm wiring and applicable building or life-safety requirements. Installation must follow the current Command Access instructions and applicable electrical codes.