The Siemens 3VA2463-5HN32-0JC0 is a 3-pole SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with a maximum breaking capacity of 187 kA at 240 V AC. It is configured for line protection and carries an ETU350 electronic trip unit with a shunt trip release (STL). The 187 kA interrupting rating at 240 V means it can safely clear a bolted fault up to that level without upstream cascading — critical for high-fault-capacity mains or distribution panels where the available short-circuit current exceeds what a standard MCCB can handle.
Breaking capacity and selectivity
Breaking capacity drops as system voltage rises: 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. At 690 V the 17 kA figure is still adequate for most industrial load-side faults, but for main incomer duty at 690 V, verify that the available fault current stays under that threshold. The high 187 kA at 240 V makes this breaker a strong candidate for 240 V delta or split-phase high-fault panels where a standard 65 kA or 100 kA MCCB would not coordinate. Rated insulation voltage Ui is 800 V, so the breaker is rated for 690 V systems without derating the insulation path. The 800 V Ui also covers 480 V and 600 V class panels with headroom.
Thermal derating and power dissipation
The 630 A rating holds at 40 °C ambient. Above that, derate continuously: 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If this breaker sits in a warm enclosure or near other heat sources, use the 50 °C or 60 °C column for your actual load — a 630 A fan motor on a 50 °C panel sees only 593 A available before the trip unit responds. Maximum power loss is 162 W at rated current, which factors into enclosure ventilation sizing.
Trip unit and auxiliary options
The ETU350 electronic trip unit provides LSIG (long-time, short-time, instantaneous, ground-fault) protection with adjustable settings — typical for selective coordination in distribution downstream of a main breaker. The shunt trip (STL) allows remote tripping via a control signal, useful for emergency-stop or fire-safety interlocks. Two auxiliary switches (HQ) are integrated for status feedback to a PLC or indication panel. No undervoltage release, no communication module, no phase-failure detection on this variant. If remote undervoltage protection or Modbus/Profibus monitoring is needed, the 3VA2 platform supports those as separate option modules — but this order code does not carry them built in.
Physical dimensions and mounting
Dimensions: 248 mm height, 138 mm width, 110 mm depth. The 138 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — fits existing 3VA2 panel cutouts and busbar layouts without re-drilling. Depth at 110 mm is shallow enough for most 400 mm deep enclosures with wiring space behind.