What this RCBO does and where it fits
The Siemens SENTRON 5SU1324-7KX06 is a 2-pole RCBO (residual current circuit breaker with overcurrent protection) combining a C-curve miniature circuit breaker and a Type A residual current device in one 3-module-wide unit. It's rated 6 A at 30 °C, with a 30 mA residual fault trip threshold and a 10 kA breaking capacity per EN 60898 — so it protects a final subcircuit against both overload/short-circuit and earth leakage in one device, saving a DIN row in the panel. Type A residual current detection means it catches pulsating DC fault currents from rectified loads — think LED drivers, switched-mode power supplies, or single-phase VFDs — not just sinusoidal AC leakage. That's the deciding factor for modern panels where you'd otherwise need a separate Type A RCD upstream.
Thermal derating and installation constraints
The 6 A rating holds at 30 °C ambient inside the enclosure. At 40 °C it derates to 5.7 A, at 50 °C to 5.4 A, and at 60 °C to 5.1 A — so if the panel runs hot (say a packed cabinet near a process oven), size the upstream protective device for the derated value, not the label current. Mounting position is any, and the supply can enter from top or bottom, which simplifies busbar routing. The 3-module-width footprint (54 mm wide, 77 mm deep, 90 mm tall) occupies three 18 mm positions on a standard DIN rail. Installation depth is 70 mm to the front of the rail. IP20 applies once the distribution board is installed and conductors are connected — so it's for enclosed panels only, not a standalone outdoor enclosure.