What this RCBO is and what the ratings mean for your panel
The Siemens 5SU1324-7FR16 is a 2-pole RCBO from the SENTRON Super Resistant K series, combining overcurrent protection (curve C, 16 A rated at 30 °C) and residual current protection (30 mA, Type A) in a single 36 mm wide module (2 modular width units). The 10 kA breaking capacity per EN 60898 means it can safely interrupt a fault current up to that level without upstream cascading — adequate for most final subcircuits in commercial and light industrial distribution boards. Type A residual current detection catches pulsating DC fault currents from electronics and rectified loads, not just sinusoidal AC. Mounting position is any, and the supply can enter from either top or bottom, which simplifies busbar layout in crowded enclosures. The IP20 rating applies when the distribution board is installed with connected conductors — standard for enclosed panel use, not for wet or outdoor locations.
Thermal derating — the real current capacity at your ambient
The 16 A rating is at 30 °C ambient. At 40 °C it derates to 15.2 A, at 50 °C to 14.3 A, and at 60 °C to 13.4 A. If your panel internal temperature runs above 30 °C — common in densely packed enclosures — use the derated figure for your load calculation, not the 30 °C headline.
Panel integration — footprint and wiring
The 5SU1324-7FR16 occupies 2 MW (36 mm) on a DIN rail, with a depth of 72 mm and an installation depth of 70 mm. The 85 mm height fits standard distribution board cutouts. Degree of pollution 3 and overvoltage category III suit fixed installations with transient overvoltages up to 4 kV surge resistance. Insulation voltage is rated 500 V.