What this MCCB carries and where it fits
The Siemens SENTRON 3VA2140-6HN32-0AA0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current Iu of 40 A across the full ambient range from 40 °C to 70 °C with no derating — that means it holds its full 40 A rating even in a hot panel at 70 °C, which is unusual for an MCCB this size. The interrupting ratings are the headline: 242 kA at 240 V, 187 kA at 415 V and at 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. Those numbers mean this breaker can sit at the main or high-fault subfeed position in a 480 V panel and still have headroom for selectivity with downstream breakers — the 187 kA at 415 V is well above typical utility fault levels in most industrial installations. It uses an ETU350 electronic trip unit, which gives adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a fixed thermal-magnetic. That matters for coordination studies: you can shape the trip curve to match downstream devices without oversizing the main.
Panel fit and integration
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard SENTRON 3VA2 footprint that drops into existing Siemens switchboard and panelboard cutouts without re-drilling the gland plate. Front IP40 protection means it's fine for indoor panel use but not washdown zones. Maximum power loss is 1.6 W, so heat buildup in a dense panel is negligible — no special ventilation required for this position. The design accepts a motor drive option, so remote trip or close via a PLC output is possible without a separate contactor.