What this MCCB delivers — and what the ratings mean for your panel
The Siemens SENTRON 3VA2440-6HL32-0DL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 400 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal budgeting in a warm enclosure. Its interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V and 440 V, and 121 kA at 500 V — numbers that put it squarely in high-fault-duty territory for industrial switchboards and transformer secondaries where available fault current is substantial. At 690 V the interrupting rating drops to 9 kA, so if your circuit runs at that voltage, verify the upstream fault level stays within that envelope. The breaker includes an undervoltage release (UVR) and a complement of auxiliary switches: two auxiliary switches plus one trip alarm switch and one electrical alarm switch (HQ configuration), giving the controls integrator status feedback without adding external relays. Maximum power loss is 66 W — a figure to factor into enclosure ventilation if the MCCB is tightly grouped with other heat sources.
Mounting and integration notes
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — a standard SENTRON 3VA frame size that fits existing 3VA panel cutouts and busbar arrangements. The basic switch variant is listed as 3VA2440-6HL32-0AA0; the -0DL0 suffix adds the UVR and the HQ auxiliary switch configuration, so if you are replacing a bare switch, confirm the accessory stack matches your control voltage.
Selectivity and coordination considerations
The breaker carries a 5 kA rating limited to 1 second — a short-time withstand figure that matters for selective coordination downstream of a larger feeder: it lets a downstream device clear a fault before this breaker trips, provided the fault current and duration stay under that threshold. A trip indicator is fitted, so a maintenance technician can visually confirm the breaker has opened on fault without needing to reset and re-energize to check.