The 2CSR254001R1105 with RCBO breaker is a 4-pole, 400VAC, DIN, IP20-rated Electrical Residual Current Breaker with Over-current Protection manufactured by ABB. It is rated at 10A for Inom and 30mA for Ires. The breaker employs a device known as a Residual Current Operated Breaker (RCBO), which combines the functions of overload, short-circuit protection, and residual-current protection in one single unit. It is designed to provide reliable protection for installations against faulty connections as well as overloading, earth leakage, and short-circuiting.