KNX Power Supply Unit DC 29 V, 640 mA

• The power supply unit provides the system power neces-sary for KNX.
• The connection to the bus line is established via the bus connection block located on the front side.
• The integrated choke prevents the data telegrams from short-circuiting on the bus line.
• When the built-in reset switch is operated (operation > 20s), the bus devices are returned to their initial state.
• For each bus line, at least one power supply unit is needed.
•  Up to two power supply units may be attached to a single bus line.
• A second unit is not required unless the supply voltage at a bus device is less than 21 V. 
• If two power supply units N 125/_2 are operated in parallel on one bus line and if the overload LED is lit on one or both power supplies, then the bus configuration has to be changed until the overload display disappears.
• Two devices of the same type can be connected di-rectly in parallel to double the current required for a line.
• No minimum bus cable length is required between the two KNX power supplies.
• The power supply units can supply DC 24 V power from an additional pair of terminals (yellow/white).
• This DC 24 V output voltage can be used to power e.g. an additional line via a separate choke N 120. 

Orders over $500 ship free within the USA (under 50 lbs). Orders under $500 carry a low cost shipping fee.

Most in-stock orders ship within 1–2 business days from Miami, FL. Delivery typically takes 3–5 business days depending on destination.

For freight or oversized orders, our team will contact you with a custom quote.

All KNXSupply products are covered by the manufacturer's warranty, ranging from 1 to 3 years depending on the brand. Warranty terms are fulfilled directly by the manufacturer.

If you experience any issue, contact us and we'll coordinate the claim process on your behalf.