Siemens 5SY6604-7CC SENTRON MCB — 4 A, C-Curve, 4-Pole
The Siemens 5SY6604-7CC is a SENTRON miniature circuit breaker rated 4 A at 400 V AC with a C tripping characteristic, configured 3P+N (4 poles). It breaks fault currents up to 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No. 235, covering both IEC and North American installations. The C-curve (5–10× In) is sized for moderate inrush loads — motor starters, contactor coils, small transformers — where the starting surge stays below 40 A before the thermal-magnetic trip clears a hard fault.
The 5SY6604-7CC occupies 4 width units (72 mm) on a DIN rail, with a depth of 76 mm and height of 90 mm. The quick-assembly mounting system snaps onto the rail without tools.