Siemens 5SY3150-7 — 50 A C-Curve MCB for Panel Protection
It breaks fault currents up to 4.5 kA per EN 60898 and 6 kA per IEC 60947-2 at 400 V AC, with a DC rating of 72 V and 15 kA per IEC 60947-2.
The 4.5 kA rating under EN 60898 covers residential and light commercial branch circuits; the 6 kA per IEC 60947-2 extends its use to industrial panelboards where higher fault current is expected. The DC rating of 15 kA at 72 V makes it suitable for control-circuit protection in DC bus applications. Energy limiting class 3 means it restricts let-through energy during a fault, aiding downstream coordination. Compared to the 32 A 5SY3132-6, the 5SY3150-7 shares the same C-curve, 1-pole form factor, and breaking capacities — the only difference is the 50 A continuous rating versus 32 A. It will drop into a panel specified for the 32 A variant without rewiring, provided the upstream protection and conductor sizing support 50 A.
The 18 mm width (1 width unit) allows dense packing. Touch protection is integral per IP20 with connected conductors. Halogen-free and silicon-free construction is specified — relevant for cleanroom or semiconductor fab environments where outgassing or particle contamination is a concern. The housing materials do not introduce halogens or silicones that could compromise process integrity.
Humidity tolerance is specified up to 95% at 55 °C, derating to 35% at 75 °C. Overvoltage category III suits fixed installation in building or industrial distribution. The design reference (5SY3) and product designation (miniature circuit breaker) are consistent with the SENTRON family. Compliance documentation includes the EN 60898 and IEC 60947-2 standards cited in the ratings. The part carries the UL 1077 and CSA C22.2 No. 235 supplementary protection rating at 5 kA for North American installations. RoHS and REACH compliance is standard for current-production Siemens SENTRON MCBs.