The Siemens 5SU1444-2RC32 is a 4-pole RCBO rated at 32 A with a D tripping characteristic and 100 mA Type AC residual current protection, occupying 8 module widths on a DIN rail. The 100 mA residual sensitivity (Type AC) covers sinusoidal AC earth faults only, not pulsating DC or smooth DC; that's standard for general-purpose socket-outlet and lighting circuits in commercial or light industrial panels, but not for EV charging or variable-speed drive outputs where DC fault components may appear.
Deployment context
The D characteristic and 100 mA residual make it a fit for motor feeder circuits in industrial control panels where the upstream protective device must coordinate with downstream contactors and overloads — not for final sub-circuits feeding hand-held equipment, which typically call for 30 mA RCD protection.