Category strategy — SENTRON 3VA frame at 250 A
The 3VA platform is Siemens' current-generation MCCB family, consolidating the legacy 3VL series under a unified accessory and mounting footprint. Breaking capacity is the headline spec for this frame size: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. The 690 V rating of 17 kA still covers most industrial distribution bus requirements. Thermal derating is published from 40 °C through 70 °C: the breaker holds full 250 A up to 50 °C, then steps down to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. That curve lets you size the breaker for a panel's actual ambient without oversizing the frame.
Lifecycle and supply base posture
No undervoltage release is fitted; no communication function is integrated.
Integration — panel fit and mounting
Dimensions are 105 mm wide, 158 mm high, 70 mm deep. The 70 mm depth keeps the breaker within typical 200 mm deep enclosure profiles, leaving room for cable bending radii behind the line and load terminals. If your BOM calls for motor protection, the 3VA family includes motor-protective variants with adjustable thermal-magnetic or electronic trip units — this specific order code is the fixed line-protection version. The supplied basic switch order code is 3VA12255EF320AA0, which is the internal switching mechanism; the external order code 3VA1225-5EF32-0KB0 is the complete assembled breaker.