Power supply for fire protection systems EN54C 27.6V/3A/2×28Ah EN54C-3A28

Uninterruptible Power Supply for Fire Protection Systems

This certified buffer power supply, designated as EN54C-3A28, is designed for reliable power supply to fire protection and smoke extraction systems, where continuous operation is critical. The device provides stabilized 27.6V DC voltage, essential for the proper functioning of sensors, sounders and other system components. In the event of a mains power failure, the power supply automatically switches to battery power, guaranteeing uninterrupted operation.

The power supply is equipped with a red steel housing (RAL 3001), which ensures durability and easy identification in the installation. It is designed to work with two 28Ah 12V lead-acid batteries – both AGM and gel types. This gives the installer flexibility in component selection and the end user confidence in system reliability.

Key features and functionality

The EN54C-3A28 power supply stands out with its advanced diagnostic and protective functions. It has independently protected AUX1 and AUX2 outputs, which increases resistance to failures and allows connection of various receivers. The microprocessor-based automation system monitors the operation of the power supply and batteries, performing regular tests and compensating for temperature changes to optimize charging. Additionally, it offers:

• High efficiency: up to 89%, which translates to lower energy consumption and operating costs.
• Wide range of protections: OVP (overvoltage), SCP (short-circuit), OLP (overload), UVP (over-discharge of batteries) and tamper (against opening the housing).
• Optical signaling: LEDs indicate the operating status of the power supply, the presence of mains and battery voltage, and any failures.
• Expandability: compatible with EN54-LB4/LB8 fuse modules and sequential EN54CLS4/EN54C-LS8 modules.
• Battery circuit resistance measurement: allows for early detection of battery problems.

Technical parameters and application

The EN54C-3A28 power supply meets the requirements of PN-EN 54-4 and PN-EN 12101-10 standards, guaranteeing its compliance with fire safety regulations. The output current is 3A in continuous operation and 1.8A in temporary operation. The device finds application in:

• Fire alarm systems (SSP)
• Smoke and heat control systems
• Fire protection and fire automation devices
• Installations requiring reliable 27.6V DC emergency power supply

The dimensions of the device are 420 x 407 x 178 mm (+8mm distance from the ground). This ensures easy installation and access to wiring.