The Siemens 5SU1344-2RC32 is a 4-pole RCBO (residual current circuit breaker with overcurrent protection) rated 32 A, D characteristic, Type AC, 30 mA residual sensitivity, occupying 8 module widths on a DIN rail. The D curve means it tolerates high inrush currents — think motor starting or transformer energization — without nuisance tripping, while the 30 mA AC-sensitive residual element covers personnel protection against line-to-earth faults.
The 8-module width (roughly 144 mm on a standard DIN rail) is a factor for panel fill — plan the gland plate and busbar routing accordingly. The D characteristic (10–20× In magnetic trip) pairs with loads that draw a high starting surge; verify the upstream short-circuit rating of the distribution board matches the RCBO's breaking capacity.