TR Power Supply 2 Amp Switchmode with 4 Outputs

In commercial and public buildings, fire safety regulations require that electromagnetic door retainers (door magnets) release immediately upon a fire alarm trigger. The TR power supply is a specialized Transformer Rectifier unit designed specifically for this task. Unlike a standard “always-on” power supply, the TR power supply features integrated control circuitry that interfaces directly with a fire alarm control panel (FACP).

When the fire alarm is activated, the TR power supply receives a signal to cut power to its 24V DC outputs. This ensures that all connected fire doors—which are held open by magnets during normal operation—are instantly released to close, compartmentalizing the building and preventing the spread of smoke and flames. The TR power supply is built for 24/7 reliability, utilizing heavy-duty linear transformer technology to provide a stable, “clean” current that won’t interfere with sensitive fire detection electronics.

Why the TR Series is the Standard for Fire Integration

The TR power supply is engineered to be a “set-and-forget” solution, meeting the rigorous BS 7273 and EN standards for fire-linked door hardware.

• Fail-Safe Control Interface: The TR power supply includes dedicated terminals for normally closed (NC) or normally open (NO) contacts from the fire panel.

   

• Stable 24V DC Output: Specifically tuned for door retainers, the TR power supply provides consistent voltage to prevent magnets from overheating or humming.

• Internal Fuse Protection: Features separate glass fuses for the mains input and the DC load, ensuring a fault at the door doesn’t take down the entire system.

• LED Status Diagnostics: Equipped with front-panel LEDs to show “Mains Present” and “Output Fault,” allowing for instant visual inspections.

   

• Heavy-Duty Steel Enclosure: Housed in a ventilated, powder-coated steel box to ensure durability in plant rooms and service cupboards.

• Low-Noise Linear Design: Unlike switching power supplies, the TR power supply produces minimal electromagnetic interference (EMI).

   

• Multi-Current Options: Available in 1 Amp, 2 Amp, and 4 Amp models to support everything from a single door to an entire floor’s worth of retainers.

   

Technical Specifications

Professional Installation for Fire Compliance

When installing a TR power supply, it is crucial to wire the control loop in a “fail-safe” configuration. This means that if the wire between the fire panel and the TR power supply is cut or damaged, the power supply will default to an “OFF” state, releasing the doors and ensuring safety even during a system failure.

We recommend locating the TR power supply in a central, accessible location such as a riser cupboard or near the main fire panel. Because these units use linear transformers, they can generate more heat than switching supplies; ensure there is adequate ventilation around the enclosure. Complete your fire safety strategy with a TR power supply—the definitive link between detection and protection.

The 2 Amp TR Power Supply Switchmode (4 Outputs) is a reliable and efficient power solution designed to provide stable DC voltage for multiple electronic devices simultaneously. With a 2-amp output and four independent channels, this switchmode power supply is ideal for access control systems, CCTV setups, and other low-voltage applications. Its compact and durable design ensures safe operation while delivering consistent performance across all connected devices.

Engineered for both professional and DIY installations, the 2 Amp TR Power Supply features switchmode technology that reduces heat generation and energy consumption, enhancing efficiency and reliability. The multiple outputs allow seamless powering of several devices from a single unit, simplifying installation and reducing wiring complexity. Perfect for commercial, residential, and industrial applications, this power supply provides a dependable, versatile, and space-saving solution for powering your low-voltage systems.