KPSB-5A Power Supply 5A 12V DC Access Control Unit with Battery Backup

12V DC Backup Power for Door Access Hardware

The KPSB-5A Power Supply delivers a regulated 12V DC output at up to 5A for magnetic locks, electric strikes and access controllers. It accepts 220V AC input and converts it through a switching regulator inside a metal enclosure. An internal battery bay accepts a 12V 7Ah sealed lead-acid pack for standby operation.

The unit supplies 60W total and holds output between 11V and 14V DC. A charging circuit maintains the standby battery at roughly 13.8V and transfers load to the battery when mains power fails. Protection circuitry covers overload, short circuit and voltage spikes, and a resettable element restores service after a fault clears.

Installers wire locks and controllers to the output terminals and set the lock delay jumper across a 0 to 10 second range. The steel housing carries a keyed protective cover and wall-mount tabs. Operating temperature spans 0°C to 40°C indoors. The unit suits offices, apartments and retail sites that need door hardware to stay powered through outages.

Key Features

• Regulated 12V DC Output at 5A
  The switching regulator holds a steady 12V rail for locks, strikes and controllers drawing up to 5A combined.

• Standby Battery Charging
  An internal charger maintains a 12V 7Ah sealed lead-acid battery at approximately 13.8V and switches the load during mains failure.

• Triple Protection Circuit

  • Overload shutdown limits current when connected hardware exceeds the 5A ceiling
  • Short circuit protection isolates the output until the fault is removed
  • Voltage clamping absorbs spikes on the 220V AC input

• Adjustable Lock Delay
  A jumper selects a release delay between 0 and 10 seconds for magnetic locks and electric strikes.

• Steel Enclosure with Keyed Cover
  The metal housing shields the transformer, board and battery from dust and accidental contact.

• Wide Door Hardware Compatibility
  Output terminals accept magnetic locks, electric strikes, exit buttons and standalone access controllers.

• Switching Topology
  The switch-mode design produces less heat than a linear supply and tolerates wide input variation.

Specifications

What’s in the Box

• KPSB-5A access control power supply unit

• Keyed enclosure cover

• Mounting screws and wall anchors

• Wiring and installation guide

Why Choose the KPSB-5A

• Five amps covers a magnetic lock pair, an exit button and a controller on one rail.

• The battery bay keeps doors operable through grid failures without a separate charger.

• Jumper-selectable release timing matches both fail-safe and fail-secure hardware.

• Switch-mode regulation runs cooler than a linear transformer in enclosed cabinets.

• The steel housing protects terminals from tampering in shared corridors and plant rooms.

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