Siemens 5SY4332-7KK11 — 32 A C-Curve MCB for Panel and Railway Duty
The 10 kA breaking capacity per EN 60898 covers standard residential and commercial branch circuits; the 20 kA rating per IEC 60947-2 means it also handles higher fault-current industrial panels where the prospective short-circuit current exceeds 10 kA. Mount it in any position and feed from either end — the combined terminal design at both top and bottom means no orientation restrictions during panel wiring.
Thermal Derating and Ambient Conditions
The 32 A rating holds at 35 °C ambient. Above that, the breaker derates: 30.72 A at 40 °C, 30.08 A at 45 °C, 29.41 A at 50 °C, 28.74 A at 55 °C, and 28.03 A at 60 °C (–). The operating range spans -40 °C to 75 °C, and humidity is capped at 95% up to 55 °C, tapering to 35% at 75 °C.
Construction and Compliance Details
The sealable design allows the panel builder to lock the breaker handle position with a padlock, meeting lockout/tagout requirements without an external accessory. Touch protection is built in.