RCBO for panel builders — what the ratings mean
The Siemens 5SU9336-1CN10 is a SENTRON RCD-operated circuit breaker (RCBO) combining overcurrent protection and residual current detection in a single 6-module-wide (108 mm) DIN-rail device. Temperature derating is baked into the spec: at 40 °C the continuous rating drops to 8.9 A, at 50 °C to 8.1 A, and at 55 °C to 7.7 A. If the RCBO sits in a crowded enclosure near transformers or contactors, size the circuit at the ambient-trimmed figure, not the 30 °C headline.
The 77 mm depth fits most shallow enclosures; installation depth is 70 mm. Six modular width units (108 mm wide) for three protected poles. That's a tight fit for a 3P RCBO — verify DIN-rail real estate before committing the BOM if the panel is already dense.
Construction and compliance
Surge voltage resistance rated at 4 000 V, surge current resistance 1 kA at 8/20 μs. Insulation voltage 440 V. Operating frequency 50/60 Hz.
