What it is and what it does
The Siemens SENTRON 5SU1324-7FR10 is a 2-pole RCBO (residual current circuit breaker with overcurrent protection) in the Super resistant K design, combining a 10 A rated current with a C tripping characteristic and a 30 mA Type A residual-current trip. It fits 2 modular-width units (36 mm) on a DIN rail and mounts in any position — no top-or-bottom orientation lock for the supply side.
Key ratings and what they mean for the panel
The C characteristic means the magnetic trip fires at 5 to 10 times rated current — typical for motor-starter or transformer-fed circuits where inrush is higher than a resistive load. The 30 mA Type A residual-current element catches sinusoidal AC faults plus pulsating DC faults (common from rectified loads like VFDs, LED drivers, or switching power supplies). Breaking capacity is 10 kA per EN 60898 (the MCB standard for household/similar installations) and 15 kA per IEC 60947-2 (the industrial breaker standard) — the higher figure gives headroom for industrial panel SCCR coordination. Pollution degree 3 and overvoltage category III mean it's rated for the industrial environment inside a distribution board, not just a clean residential panel.
Thermal derating — the real-world current
The 10 A rating holds at 30 °C ambient. At 40 °C it derates to 9.6 A, at 50 °C to 9.1 A, and at 60 °C to 8.6 A.
Panel integration notes
The 5SU1324-7FR10 occupies 2 MW (36 mm) on a DIN rail, with a depth of 72 mm and height of 85 mm. Installation depth is 70 mm — account for that behind the gland plate. IP20 protection applies once the distribution board is installed with conductors connected; it's not rated for washdown or outdoor exposure. Touch protection is built in (finger-safe terminals). Supply can enter from top or bottom, which simplifies busbar routing in a crowded enclosure.