What this MCCB carries — and where it stops
The Siemens 3VA1140-3EF36-0HC0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current, with a TM240 thermal-magnetic overcurrent release and a 3-pole line protection configuration. Breaking capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The 40 A rating holds flat from 40 °C through 50 °C, then derates to 36 A at 70 °C; that thermal curve matters if you're packing this into a warm panel. No communication module, no ground-fault monitoring, no phase-failure detection — this is a straight-ahead line-protection breaker with a shunt trip (STL) and two HQ auxiliary switches. The auxiliary trip order code is 3VA9688-0BL30.
Sizing into the panel — DIN footprint and derating
Mounting footprint: 76.2 mm wide, 130 mm tall, 70 mm deep. That 76.2 mm width is a standard 3-module DIN-rail pitch — it clips into the same rail space as a 3-pole motor starter or a three-phase contactor block. IP40 on the front means it's fine inside a closed enclosure; no washdown rating here. The 15 000 latching endurance cycles tell you this breaker is sized for a fixed distribution panel, not a daily-switched disconnect. If you're replacing a 3VA1110-5EE32-0JA0, check the width — that peer is a 3-pole frame too, so the rail cutout and busbar spacing should carry over, but verify the lug kit and terminal centerline before committing the gland plate.