Feller AG is a provider of electrical installation products, building technology, and related services. Its portfolio includes switches and sockets, dimmers, room thermostats, motion detectors, distribution equipment, network and communication products, access systems, and installation materials. The company also offers connected-building solutions such as Wiser by Feller, KNX, Matter, and DALI, alongside planning tools, technical documentation, training, and support for installation and commissioning.

Feller has discontinued zeptrion, zeptrionAIR, and the zeptrion planning software as of February 28, 2025. To help keep existing zeptrion installations operating, it offers repair parts from March 1, 2025. Available items include functional inserts, cover sets, module devices, signal couplers, and weather sensors; zeptrion buttons remain available because they are also used in KNX installations. Replacement parts are sold exclusively through Feller’s Customer Service Center to electrical contractors. Feller provides a five-year warranty on products until discontinuation and a two-year warranty on replacement parts thereafter. Support, warranty service, repair parts, and product documentation remain available for existing installations.