N 120/02 KNX External Bus Choke 640mA for Power Supply Unchoked Output DIN 5WG1120-1AB02

The N 120/02 KNX choke is a 640 mA external inductive filter designed for use with KNX power supplies that do not have an integrated choke, or for connection to the unchoked output of N 125/x2 series power supplies. It provides the current limiting and bus stabilization required for reliable KNX communication by decoupling the power supply from the bus line.

The choke features dedicated terminals for the unchoked voltage input and the choke-protected KNX bus output. As a modular installation device, it mounts directly on standard TH35 DIN rail per EN 60715 and occupies only two module widths, making it easy to add to existing panels. Using an external choke allows system designers to place power conversion and filtering functions separately, improving layout flexibility and thermal management.

• Terminal for unchoked voltage input
• Terminal for choke-protected KNX bus output
• Compact DIN rail design
• Easy integration into existing panels
• Improved thermal management

• Adding choke protection to unchoked power supplies
• Extending secondary KNX lines from N 125/x2 unchoked outputs
• Building redundant or segmented bus topologies
• Upgrading legacy installations to meet KNX choke requirements
• Creating flexible power distribution in large automation systems
• Separating power and choke functions for thermal management
• Supporting star or tree bus wiring topologies