SIEWERT & KAU Siewert & Kau is the official distributor for the products of many renowned manufacturers. As IT wholesaler, we always negotiate advantageous contracts for our customers. For you, this means saving time and money: You don't have to spend ages comparing offers, but rather get the best possible price from us directly. You also save on the time-consuming compilation of components, as we put the products together accordingly to your exact requirements.