The Siemens SENTRON 5SL4301-6 is a B-curve miniature circuit breaker rated 1 A at 400 V AC, 3-pole construction, with a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2.
Thermal derating and ambient conditions
At 30 °C ambient the breaker holds its full 1 A rating; at 40 °C it derates to 0.96 A, at 45 °C to 0.94 A, and at 55 °C to 0.9 A. If this breaker sits near a heat source — say, adjacent to a drive or in a roof-mounted enclosure — account for the derating curve when sizing the circuit.
Depth is 76 mm (70 mm behind the panel). Width 54 mm (3 MW). Sealable terminals, halogen-free and silicon-free construction. IP20 with connected conductors. The 50/60 Hz rating covers global mains frequencies.