ABB KNX Line Coupler [LK/S4.2] - Secure and Efficient Connection for Large KNX Installations

The ABB i-bus® KNX Line Coupler LK/S 4.2 (SKU: 2CDG110171R0011) is a modular DIN rail device designed for use as a line coupler, field coupler, or repeater in KNX (TP) building automation systems. The device is 2 modules wide and easily integrated into standard electrical panels. As a line coupler, the LK/S 4.2 connects a line to a main line; as a field coupler, it connects a main line to a field line. In this configuration, it provides electrical isolation between lines. The device supports filtering of 14...31 master groups in conjunction with ETS4. It offers long frame support compatible with ETS5 and later versions. For security, the LK/S 4.2 supports KNX Data Secure communication, processing, filtering, transmitting, or blocking secure telegrams depending on the settings. This feature provides a significant advantage in commercial and industrial projects where data security is critical in building automation systems. Its physical dimensions are 36 mm (width) × 90 mm (height) × 64.5 mm (depth), and it weighs only 0.09 kg. It has an IP20 protection rating and a low power consumption of 0.3 W. The device is light grey and does not have manual operation. It complies with the RoHS Directive 2011/65/EU and its amendment 2015/863. It has a CE conformity declaration. It does not require batteries. The LK/S 4.2 is an ideal solution for system integrators and electrical engineers who want to manage interline communication securely and efficiently in large-scale KNX topologies.