Siemens SENTRON 3VA2325-5HN32-0DL0 — 250 A MCCB with Undervoltage Release
This is a Siemens SENTRON molded case circuit breaker built for line protection, rated 250 A continuous at 40 °C and carrying a 3 000 A frame. The 3VA2325-5HN32-0DL0 is a 3-pole unit with an undervoltage release (UVR) and a full auxiliary switch deck: two auxiliary switches, one trip alarm switch, and one electrical alarm switch — the HQ configuration. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 500 V, tapering to 7.5 kA at 690 V. That kind of headroom means it handles high-fault utility feeds or large transformer secondaries without upstream fuses.
What the Ratings Mean for Your Panel
The 250 A continuous rating holds flat from 40 °C all the way to 70 °C — no derating curve to chase in a hot enclosure. That is unusual for an MCCB this size; most lose 10–15 % by 60 °C. The 3 000 A frame means the internal trip mechanism is built for high short-circuit energy, so the breaker stays selective with downstream 100–200 A devices. At 690 V the interrupting rating drops to 7.5 kA, which still covers most 690 V motor circuits with typical transformer impedances.
Panel Fit and Integration
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — a standard SENTRON 3VA frame that bolts into a panel or mounts on a DIN rail adapter. The undervoltage release (UVR) drops the breaker on loss of control voltage, which is common for emergency-stop circuits or undervoltage protection on motor feeders. The auxiliary switch deck (2 aux + 1 trip alarm + 1 electrical alarm) gives you enough dry contacts for remote status, PLC inputs, and a separate trip-indication circuit without adding a side-mount block.