D-curve 50 kA breaker for high-inrush industrial loads
The Siemens SENTRON 5SY8506-8 is a 2-pole (1P+N) miniature circuit breaker with a D tripping characteristic, rated 50 kA at 230 V AC per IEC 60947-2. On the DC side it breaks 15 kA at 60 V (max 72 V), and under UL 1077 / CSA C22.2 No.235 it's rated 5 kA — so for a North American panel that follows UL 508A, the SCCR contribution is 5 kA at 250 V AC single-phase. The neutral is switched (1P+N), which simplifies isolation on single-phase sub-circuits where you want the neutral opened with the phase.
Panel fit and environmental tolerance
Dimensions are 90 mm height, 36 mm width, 76 mm depth (70 mm installation depth). Operating temperature spans -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, dropping to 35% at 75 °C. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz — it holds up on a machine frame or near a conveyor drive without loosening.