630 A MCCB with ETU560 — line protection for main feeders
The Siemens SENTRON 3VA2463-6JQ32-0DH0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, carrying the ETU560 electronic trip unit for adjustable overload and short-circuit protection on main feeders and large branch circuits. Breaking capacity runs 242 kA at 240 V and 187 kA at 415 V, dropping to 40 kA at 690 V — this unit handles high-fault utility feeds and industrial distribution without cascading upstream. Rated insulation voltage is 800 V, so it suits 480 V and 600 V class panels with headroom for transient overvoltages.
Trip unit and auxiliary releases
The ETU560 electronic trip unit supports adjustable long-time, short-time, instantaneous, and ground-fault protection curves — typical for selective coordination in a distribution switchboard. An undervoltage release (UVR) is integrated, and the ground-fault monitoring uses summation current formation on the line conductor, so the breaker can trip on ground leakage without a separate relay. Auxiliary contacts are configured as 2 auxiliary switches plus 1 trip alarm switch HQ — enough for remote status and alarm indication back to a PLC or SCADA.
Thermal derating and panel integration
The 630 A rating is at 40 °C ambient; derate to 450 A at 70 °C for hot enclosures or high-density layouts. Maximum power loss is 164.5 W — factor that into enclosure ventilation calculations. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — fits standard SENTRON 3VA mounting patterns for retrofit into existing panel cutouts. Operating range is -25 °C to 70 °C; storage range -40 °C to 80 °C. The storage minimum matters for unheated warehouses in cold climates — this breaker can sit through a northern winter without damage.