This is the current-production variant, so it's the one to specify for new builds or as a like-for-like spare on an existing SENTRON panel.
At 16 A / 30 °C, it handles a 3–4 kW resistive or motor load on a 230/240 V AC supply. The 4 MW width (72 mm) occupies four 18 mm modular units on a DIN rail — check your gland plate fill if you're swapping in a tighter enclosure. Temperature derating is baked in: 14.6 A at 40 °C, 13.9 A at 45 °C, 13.3 A at 50 °C, 12.5 A at 55 °C. The RCBO itself is rated for any mounting position and can be fed from top or bottom, which simplifies wiring in a crowded enclosure.
The 5SU9326-1CR16 is listed as current-production (lifecycle stage: current). No last-time-buy or phase-out notice is on record for this order code.
The RCBO is halogen-free and silicon-free, rated IP20 with conductors connected and the distribution board installed. The surge voltage resistance is rated at 4 kV, and it withstands a 1 kA surge current (8/20 µs waveform). Compliance documentation (RoHS, REACH) is provided with the brand's standard declaration pack.