MCCB for motor protection — 200 A frame with ETU350M
The Siemens 3VA2220-7MN32-0AC0 is a 3-pole SENTRON molded case circuit breaker rated 200 A continuous current at 40 °C, built for motor protection duty with an ETU350M electronic overcurrent release. Breaking capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V — high enough for most downstream fault scenarios without cascading upstream.
Thermal derating and power budget
Continuous current holds at 200 A from 40 °C through 50 °C, then derates to 192 A at 55 °C, 188 A at 60 °C, 184 A at 65 °C, and 180 A at 70 °C — useful when the breaker sits near other heat sources in a crowded panel. Maximum power loss is 75 W, which factors into enclosure thermal calculations for a 200 A frame.
Lifecycle and sourcing position
The base switch variant is 3VA2220-7MN32-0AA0; this -0AC0 suffix adds 2 auxiliary switches (HQ type) and phase failure detection, with no undervoltage release, no voltage trigger, and no ground-fault monitoring.