The Siemens SENTRON 5SY7203-7CC is a 2-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated 3 A at AC and 50/60 Hz. Rated current derates with ambient temperature: 3 A at 35 °C, 2.84 A at 40 °C, 2.75 A at 45 °C, 2.66 A at 50 °C, and 2.56 A at 55 °C. For a panel running at 40 °C ambient, expect 2.84 A continuous — factor that into load planning. Halogen-free and silicon-free construction makes this MCB suitable for cleanroom and semiconductor-fab environments where outgassing or particle contamination from standard plastics is unacceptable. The materials are particle-neutral by design.
Installation depth is 70 mm; total depth 76 mm. Fastens via quick assembly system — snaps onto the rail without tools. Any mounting position is permitted, and the power supply cord can enter from any side. Combined terminal at top and bottom accepts conductors with touch protection (IP20 with connected conductors). Sealable design allows tamper-evident locking for metering or critical circuits.
Breaking capacity rated 30 kA per IEC 60947-2 and 5 kA per UL 1077 / CSA C22.2 No.235 — covers both IEC and North American installations. Vibration resistance tested per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz.