What this MCCB is and where it fits
The Siemens SENTRON 3VA2225-5HN32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 250 A. The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves, and the breaker includes an undervoltage release (UVR) for coordinated shutdown in safety circuits. With interrupting capacities of 187 kA at 240 V and 121 kA at 415 V, it is sized for high-fault installations such as main switchboards or large distribution panels where selectivity with downstream breakers is required.
Key ratings and what they mean for your panel
The 250 A rating at 40 °C is the baseline; the breaker holds that full current up to 50 °C, then derates linearly to 213 A at 70 °C. If your enclosure runs hot — say, a packed switchboard with multiple breakers — the 60 °C figure of 232 A is the one to design against. The interrupting ratings step down with voltage: 187 kA at 240 V (typical for 208/240 V distribution), 121 kA at 415/440 V, 79 kA at 500 V, and 5.1 kA at 690 V. At 690 V the breaker is still usable for low-fault motor circuits, but you will need to verify the available fault current at that voltage.
Dimensional fit and integration
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. That width is three 18 mm pole pitches — standard for a 3-pole MCCB in a SENTRON panelboard or on a DIN rail. The depth of 86 mm leaves clearance for rear-mounted busbars or cabling channels in a 200 mm deep enclosure.