The Siemens 5SY7403-7CC is a SENTRON miniature circuit breaker, 4-pole, C-curve, rated 3 A at 50/60 Hz AC. It carries a 30 kA breaking capacity per IEC 60947-2, with a 5 kA rating per UL 1077 and CSA C22.2 No.235. Finger-safe touch protection is built in.
Temperature Derating
Above that, derate linearly: 2.84 A at 40 °C, 2.75 A at 45 °C, 2.66 A at 50 °C, 2.56 A at 55 °C. If the panel runs hot, size the breaker for the actual load current at your ambient, not the 40 °C nameplate.
Compliance & Approvals
Halogen-free and silicon-free construction. Sealable for lockout/tagout. Vibration resistance tested per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz.