What this RCBO covers
The Siemens SENTRON 5SU1354-7VK20 is a 2-pole (1P+N) RCBO — residual current circuit breaker with overcurrent protection — rated 20 A at 230/240 V AC, 50/60 Hz. The 30 mA residual-current trip and Type A sensitivity mean it detects sinusoidal AC faults plus pulsating DC faults up to 6 mA smooth DC, which covers most modern electronics and variable-speed drives on the protected circuit. Tripping characteristic C (magnetic release at 5–10× In) handles motor inrush and capacitive loads without nuisance tripping, while the 10 kA breaking capacity per EN 60898 and 20 kA per IEC 60947-2 give it headroom for commercial and light industrial panels where fault currents stay under 10 kA at the service entrance.
Panel fit and environmental limits
Occupies 2 modular width units (36 mm) on a DIN rail. Depth is 77 mm, installation depth 70 mm — fits standard 80 mm deep enclosures. Mounting position any, so it can go sideways or inverted in tight sub-distribution boards. Rated IP20 once the distribution board is installed and conductors connected; that means dry, indoor locations only. Ambient range -40 °C to 75 °C covers unheated warehouses and rooftop cabinets in moderate climates. Halogen-free and silicon-free construction matters for clean-room or semiconductor-adjacent installs where outgassing contaminates optics or wafers.