ABB KNX Power Supply 640mA

ABB 640 mA Power Supply for KNX — SV/S30.640.3.1

The ABB SV/S30.640.3.1 is a 640 mA power supply for KNX lines. Because it delivers full capacity, it feeds main lines and busy segments. As a guide, one 640 mA power supply powers up to roughly 64 bus devices. Therefore, consultants often specify it by default on larger projects.

What the 640 mA power supply does

First, it converts mains power to the safe SELV voltage that KNX needs. In addition, it includes an integrated choke, so you do not need a separate one. It also protects the line against short circuits and overloads. As a result, the bus keeps running, even when a fault appears downstream.

Where it fits

For commercial floors, hotel corridors and villa main lines, this supply is the safe choice. However, when a line is small, the 320 mA model is enough and costs less. Because both units share the same design, you can mix them freely across a building. Meanwhile, the compact DIN-rail housing keeps the panel tidy.

Installation and use

The unit mounts on a standard DIN-rail. Next, you connect mains power and the KNX bus. Front LEDs then show the line status at a glance. Finally, you commission the line in ETS. It works alongside the wider ABB i-bus KNX range.

Planning the line load

Good planning starts with the device count. So, count the sensors, actuators and displays on the line first. Then, add a margin for future additions. Next, compare that total against the 64-device guide. If the number is high, choose the 640 mA power supply for headroom. If it is low, the 320 mA unit will do. In short, size the supply to the line, not the other way round.

Technical specifications at a glance

• Output: 640 mA, 30 V DC (SELV)
• Choke: Integrated
• Protection: Short-circuit and overload
• Protocol: KNX (KNX-TP)
• Mounting: DIN-rail (MDRC)
• Order code: SV/S30.640.3.1

Infinitex supplies ABB KNX products in the UAE, and we offer project pricing with ETS support.