Siemens 5SY6103-6CC — 1-pole B-curve MCB, 3 A, 6 kA
The Siemens SENTRON 5SY6103-6CC is a 1-pole miniature circuit breaker (MCB) with a B tripping characteristic, rated 3 A at 50/60 Hz. It breaks fault currents up to 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235.
B-curve trip and thermal derating
The 3 A rating holds at 35 °C ambient; at 40 °C it derates to 2.76 A, at 50 °C to 2.49 A, and at 55 °C to 2.34 A. If the panel runs hot (enclosed DIN rail, poor airflow), size up one step or account for the derated figure in the load calculation.
Occupies 1 modular unit (18 mm width) on standard DIN rail. The quick-assembly fastening system snaps onto the rail without tools; mounting position is any. Sealable terminals (top and bottom combined) let the panel builder lock the cover after commissioning — useful for utility-metering or tamper-evident enclosures.
Listed as current production (active lifecycle stage). Halogen-free and silicon-free construction, which matters for clean-room or semiconductor-adjacent panels where outgassing contaminates optics or contacts.