Siemens 3VA2325-5MN32-0BL0 — 250 A SENTRON MCCB for Motor Protection
The Siemens 3VA2325-5MN32-0BL0 is a SENTRON molded case circuit breaker (MCCB) rated at 250 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed up to 70 °C. The breaker carries a breaking capacity of 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — so it handles high-fault utility feeds or transformer secondaries down to the motor branch.
Breaking Capacity and Fault Interruption
The trip indicator gives a visual flag after a fault event, speeding up troubleshooting on the line.
Motor Protection Features and Auxiliary Configuration
This breaker is purpose-built for motor protection, meaning its thermal-magnetic or electronic trip curve is shaped for motor inrush and overload profiles. The undervoltage release (UVR) drops the breaker on a brownout or power loss, so motors don't restart unexpectedly when power returns. The auxiliary switch block provides 2 N.O./N.C. auxiliary contacts, 1 trip alarm contact (flags a fault trip vs manual open), and 1 electrical alarm switch — enough for remote status monitoring without extra wiring.
Width of 138 mm is typical for a 3-pole 250 A MCCB; leave at least 25 mm side clearance for heat dissipation and arc-chamber venting per Siemens mounting guidelines.
Maximum power loss is 40 W at full rated current. In a sealed, non-ventilated enclosure with multiple breakers, sum the power losses and check the enclosure's dissipation rating — 40 W per breaker adds up in a multi-circuit panel.