Siemens 5SU1354-7GV10 — SENTRON RCBO, 10 A, Type C, 10 kA
The Siemens 5SU1354-7GV10 is a SENTRON RCBO (residual current circuit breaker with overcurrent protection) in a 1P+N, 2-pole design, rated 10 A at 30 °C with a Type C tripping characteristic. It occupies 2 modular width units (36 mm) on a DIN rail and can be fed from either top or bottom, with any mounting position accepted. The Type C curve trips between 5 and 10 times rated current, making it suitable for circuits with moderate inrush — motorized loads, small transformers, or lighting banks where the start-up surge would nuisance-trip a Type B. The 10 kA breaking capacity per EN 60898 covers most domestic and light commercial panel duties; the 20 kA rating per IEC 60947-2 gives headroom for industrial distribution boards where fault currents run higher. Rated voltage is 230/240 V AC at 50 Hz, with an insulation voltage (Ui) of 264 V and surge voltage resistance of 4 kV. Overvoltage category III and pollution degree 2 mean it's rated for fixed installation in building distribution panels, not for outdoor or wet locations — the IP20 rating (with connected conductors and installed distribution board) confirms indoor use only.
Thermal derating and real-world current
The 10 A rating at 30 °C derates linearly as ambient temperature rises: 9.5 A at 40 °C, 9.3 A at 45 °C, 9 A at 50 °C, 8.7 A at 55 °C, 8.5 A at 60 °C, 8.2 A at 65 °C, and 8 A at 70 °C. In a crowded panel where internal temperature hits 50 °C, the effective continuous current drops to 9 A — factor that into your load calculation rather than relying on the 30 °C nameplate figure.
Integration and panel fit
Dimensions are 77 mm depth, 36 mm width (2 MW), 90 mm height, with an installation depth of 70 mm. The 36 mm width matches standard DIN-rail modular devices — it occupies the same footprint as two single-pole MCBs side by side. The IP20 rating means the distribution board must be closed and conductors connected for the protection to be effective; this is normal for panelboard installation, not a standalone enclosure.