Siemens 5SY6201-8CC SENTRON MCB, 2-Pole, 1 A, D Curve

The D curve means this breaker is built for loads with a high inrush — think small transformers, solenoid valves, or motor starters where the starting current can hit 10 to 14 times the rated current for a few cycles. The 1 A rating is the continuous thermal current; the magnetic trip won't pop on a brief surge, but it will clear a hard short fast. With a pollution degree of 3 and overvoltage category III, it's rated for the industrial environment inside a panel — not just clean office gear. It also carries a 5 kA rating under UL 1077 and CSA C22.2 No.235, so it's accepted in North American supplementary-protection applications. Temperature range is wide: -40 °C to 75 °C ambient. Mount it in any position, and the quick-assembly system lets you gang breakers without extra busbar hardware.