What this 4-pole MCCB does on the line
The Siemens SENTRON 3VA2025-8HM46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated at 25 A continuous current (Iu) across the full ambient range from 40 °C up to 70 °C — no derating needed as the panel warms up. That flat thermal curve is unusual for an MCCB this size and saves you the head-scratching when the enclosure runs hot. It carries an ETU330 electronic trip unit, so you get adjustable overload and short-circuit protection curves rather than fixed thermal-magnetic bimetals. That means you can dial in coordination with downstream breakers without swapping the whole device. The interrupting capacity hits 440 kA at 240 V, 330 kA at 415 V, and still 52.5 kA at 690 V — high enough for most distribution panels without needing a current-limiting upstream fuse. The rated insulation voltage (Ui) is 800 V, so it's comfortable in 480/277 V or 690 V systems.
Ground-fault and neutral configuration
This version includes ground-fault monitoring via summation current formation on L + N conductors — it measures the vector sum of line and neutral currents to detect leakage. The N-conductor protection is adjustable: you can set it to OFF (no neutral protection) or 100% of the phase rating, which is handy when you're feeding a load that doesn't need full neutral protection. It has no undervoltage release, no voltage trigger, and no communication module — this is a straightforward line-protection breaker, not a smart metering device. If you need remote trip indication or power monitoring, you'd add external accessories.
Mounting and panel fit
The 3VA2025-8HM46-0AA0 measures 140 mm wide, 181 mm tall, and 86 mm deep — a standard 4-pole MCCB footprint that drops into Siemens SENTRON distribution panels and most DIN-rail or screw-mount enclosures. Front protection is IP40, so it's fine in a clean indoor panel but not for washdown areas. Power loss is just 0.5 W maximum, so heat buildup in a dense cabinet is minimal. Storage range spans -40 °C to 80 °C; operating range is -25 °C to 70 °C.