Siemens 3VA1220-5MH32-0KH0 — 200 A SENTRON MCCB, Starter Protection Design
The Siemens 3VA1220-5MH32-0KH0 is a 3-pole SENTRON molded case circuit breaker rated for 200 A continuous current at 40 °C ambient, with a design specifically for starter protection — meaning it's built to coordinate with motor starters and contactors in motor control center (MCC) applications, not just general distribution. Interrupting capacity reaches 187 kA at 240 V, dropping to 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V — the 690 V figure is low enough that this breaker is best applied at 480 V or below for high-fault installations. Thermal derating is minimal up to 50 °C (full 200 A), then drops to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C — a 12% reduction at the top end, which matters for enclosed panels with limited ventilation. Rated insulation voltage is 800 V, and maximum power loss is 42 W — a manageable figure for heat dissipation in a standard enclosure, but worth noting if multiple breakers are ganged in a small cabinet.
Auxiliary Configuration and Release Options
This breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ), and includes a shunt trip release (STL) for remote tripping — no undervoltage release is fitted, so if UVR is required for your safety circuit, this variant won't cover it. The supplied basic switch is order code 3VA12205MH320AA0; the auxiliary switch design is factory-integrated, not field-addable on this variant.
Dimensions and Panel Fit
Footprint is 105 mm wide by 158 mm tall by 70 mm deep — a standard SENTRON 3VA12 frame size that fits existing 3VA panel cutouts and busbar systems without modification. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.