Siemens SENTRON 3VA2225-7HL32-0BA0 — 250 A MCCB with ETU320
The Siemens SENTRON 3VA2225-7HL32-0BA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, using an ETU320 electronic trip unit for line protection. Its interrupting capacity reaches 330 kA at 240 V and 242 kA at 415 V, dropping to 6.3 kA at 690 V — the high fault-current headroom at low voltages makes it a fit for transformer secondary or bus-tie applications where available fault current is extreme.
What the ratings mean for your panel
The 250 A rating holds flat from 40 °C to 50 °C, then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your enclosure ambient runs above 50 °C, size the breaker for the derated value — not the nameplate 250 A. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin. The ETU320 electronic trip unit provides adjustable long-time, short-time, instantaneous, and ground-fault protection (though this variant ships without ground-fault monitoring). No communication module, no phase-failure detection, and no auxiliary contacts are included — this is a bare line-protection breaker. An undervoltage release (UVR) is fitted as standard.