The circuit breakers of the xEffect NZM-PX-TAZ series with Power Expert Release (PXR) electronics cover application cases for full-range protection, including earth fault protection, with just four compact sizes and are suitable for the IEC market. The integrated energy measurement function provides currents, voltages, and active energy (kWh) with accuracy class 1 according to IEC 61557-12. Maintenance mode ARMS and zone selectivity for enhanced protection are included. A test function and settings via micro-USB interface are directly possible at the switch. Installation is flexible due to modular functional groups and can be supplemented by a comprehensive range of accessories. Effective value measurement and thermal memory are also available.