What the ratings mean for fit
The Siemens SENTRON 3VA1120-5EF46-0AA0 is a 4-pole molded case circuit breaker (MCCB) with a TM240 thermal-magnetic overcurrent release, rated 20 A continuous. That 20 A holds flat from 40 °C up to 55 °C, then derates to 19 A at 60–70 °C — no head-scratching over summer ambient spikes (–). The 187 kA breaking capacity at 240 V means it can interrupt a massive fault without upstream coordination issues; at 415 V it still clears 121 kA, and at 690 V it holds 17 kA. That kind of short-circuit rating is what you spec for high-fault utility feeds or transformer secondaries where a standard MCCB would cascade open. The 800 V rated insulation voltage covers most 480/600 V industrial systems with margin. IP40 on the front keeps tools and fingers out but isn't washdown-rated — this lives inside a panel.
Panel integration and dimensions
The 3VA1120-5EF46-0AA0 measures 70 mm deep, 101.6 mm wide, 130 mm high (–). That 101.6 mm (4 in) width for a 4-pole MCCB is standard — it fits the same DIN-rail or mounting-plate footprint as other SENTRON 3VA frames. No undervoltage release, no communication module, no trip indicator — it's a straight line-protection device. The TM240 release is fixed thermal-magnetic, not electronic, so no auxiliary power needed for the trip unit. Ground-fault monitoring is absent; if you need that, look at the 3VA variants with the optional GF module.