What this RCBO does in the panel
The ABB 2CSR254101R1635 is an RCBO (Residual Current Breaker with Overcurrent Protection) from the RCBO series, classified under Residual Current Breakers (RCCB/RCBO) and Molded Case Circuit Breakers. It combines ground-fault and overcurrent protection in one device, saving a DIN-rail position in the panel compared to separate RCCB and MCB.