SENTRON 3VA1220-4EF42-0AF0 — 200 A MCCB with TM240 Release
The Siemens SENTRON 3VA1220-4EF42-0AF0 is a 4-pole molded case circuit breaker (MCCB) rated for 200 A continuous current at 40 °C, carrying the TM240 thermal-magnetic overcurrent release. Breaking capacity is specified across five voltage levels: 121 kA at 240 VAC, 75.6 kA at 415 VAC, 52.5 kA at 440 VAC, 17 kA at 500 VAC, and 11.9 kA at 690 VAC.
Above that, derating applies linearly: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. The maximum power loss is 42 W at rated load; that figure drives enclosure ventilation sizing, not the breaker's own thermal limit.
Auxiliary and Alarm Switching
The auxiliary switch signals the open/closed state of the main contacts; the trip alarm switch closes only on a fault trip (overcurrent or short-circuit), not on manual opening. For remote status monitoring or PLC-based fault annunciation, these contacts provide the dry-contact feedback without requiring an external shunt trip or undervoltage release — neither is present on this variant. If you need Modbus, PROFIBUS, or ground-fault alarm, this is the wrong variant — look at the 3VA1 with communication module option or the 3VA2 series with electronic release.