The WAGO current and energy measurement technology portfolio is supplemented by plug-on current transformers for billing purposes. They correspond to module D of the conformity assessment procedure and can be optimally combined with the new WAGO energy meters (MID) to form a complete solution. A quick fastening adapter enables simple and inexpensive fastening in the control cabinet. The user benefits from a high level of flexibility thanks to the many mounting options. The new plug-on current transformers are used in applications in which the electricity of large consumers cannot be measured directly, for example when measuring the energy consumption of producing machines in order-related manufacturing or when billing the individual energy consumption per Tenants in distributed properties.