630 A MCCB with ETU350 — what the ratings mean for your panel
The Siemens SENTRON 3VA2463-7HN32-0BH0 is a 3-pole molded case circuit breaker rated for 630 A continuous current (Iu) at 40 °C ambient, with the ETU350 electronic trip unit governing the overload and short-circuit protection curve. Per the datasheet, the breaker carries a rated insulation voltage of 800 V and delivers a breaking capacity of 330 kA at 240 V AC, stepping down to 242 kA at 415/440 V and 187 kA at 500 V — the figure that governs fault clearance at your service voltage. The 630 A frame is the rating that determines busbar and cable sizing upstream; the thermal derating table from 40 °C through 70 °C (630 A down to 520 A) is what you apply when the breaker lives in a warm enclosure.
Trip unit, auxiliary contacts, and undervoltage release
The ETU350 overcurrent release is a microprocessor-based unit offering adjustable long-time, short-time, instantaneous, and ground-fault protection curves — the standard choice for selective coordination in distribution switchboards. The breaker ships with an undervoltage release (UVR) as the auxiliary release design, plus a 2 auxiliary switch + 1 trip alarm switch HQ configuration for status feedback to the PLC or SCADA. The integrated auxiliary trip module carries order code 3VA9608-0BB11, which is the service part if the release needs replacement. Maximum power loss through the breaker at rated current is 164.5 W — relevant for thermal management inside a closed panel.
Physical fit and environmental limits
Dimensions are 248 mm high × 138 mm wide × 110 mm deep — a standard 3-pole MCCB footprint for 630 A frames, designed for screw-mounting on a mounting plate or DIN rail adapter. Operating temperature range is -25 °C to +70 °C, with storage from -40 °C to +80 °C. The latching endurance is rated at 15,000 cycles, which is the mechanical life before contact wear becomes a consideration for maintenance scheduling.