Siemens SENTRON 3VA1220-4EF32-0KH0 — 200 A MCCB, Line Protection, Active Production
Rated insulation voltage is 800 V, and the breaker is designed without undervoltage release or ground-fault monitoring, but includes a shunt trip (STL) and two auxiliary switches plus one trip alarm switch (HQ).
Thermal Derating and Breaking Capacity — What They Mean for Fit
The 200 A rating holds from 40 °C through 50 °C ambient, then derates linearly to 176 A at 70 °C. If the panel ambient runs above 50 °C, the continuous load must be reduced accordingly — a common oversight when stuffing breakers into a hot enclosure. Breaking capacity varies with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. This covers most low-voltage distribution panels; the 690 V figure is notably lower, so verify fault current at that level.
Dimensions and Panel Integration
The breaker measures 105 mm wide, 158 mm high, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. Power loss is 42 W maximum, so factor that into enclosure thermal calculations. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The trip indicator and voltage trigger are present, and the auxiliary switch configuration (2 aux + 1 trip alarm) is built in — no separate add-on module needed for basic signaling.