The Siemens 5SU1374-8AK81 is a heavy-duty 4P 100A RCBO engineered for 400V industrial power systems requiring specialized Type B residual current detection. Installed as a main incomer, this 72mm unit combines 30mA earth leakage sensing with robust overload and short circuit protection.
Quick Answer
You should absolutely buy the Siemens 5SU1374-8AK81 if your industrial 400V power system requires high-capacity 4P 100A circuit protection with advanced 30mA Type B earth leakage detection. This unit is specifically engineered for critical loads and environments where detection of smooth DC residual currents is paramount, making it an indispensable asset for heavy industrial applications.
This RCBO is the definitive choice for robust 400V industrial installations demanding 4P 100A Type B protection for specialized machinery and critical panels. Conversely, it's excessive for standard residential or light commercial uses that don't require high current, advanced fault detection, or its premium industrial build.