The Siemens SENTRON 5SU9356-1CR40 is an RCBO — a residual current circuit breaker with integral overcurrent protection — rated 40 A with a 30 mA Type AC residual trip, C-curve characteristic, in a 1P+N (2-pole) form factor. It's designed for 230/240 V AC single-phase circuits at 50/60 Hz. The 30 mA residual sensitivity covers basic personnel protection against direct contact.
Supply can enter from either top or bottom; the design is instantaneous (non-time-delayed) Type AC, meaning it trips on sinusoidal AC residual currents without intentional delay.
Halogen-free and silicon-free construction. Overvoltage category III, pollution degree 2, surge voltage resistance 4 000 V.