What this MCCB delivers on the line
The Siemens 3VM1140-5EE32-0AA0 is a SENTRON 3-pole molded case circuit breaker rated 40 A continuous at 40 °C, with a TM220 thermal-magnetic trip unit for line protection. Breaking capacity hits 187 kA at 240 V AC, 121 kA at 415 V, 76 kA at 440 V, and still 17 kA at 500 V — so it clears high-fault scenarios without cascading upstream, especially on 240 V distribution where the 187 kA figure covers virtually any industrial fault.
Trip unit and thermal performance
TM220 means a fixed thermal-magnetic release with no interchangeable rating plugs — what you see is what protects the feeder. The 40 A rating holds flat through 50 °C; at 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. That thermal curve matters if the breaker sits in a warm cabinet near drives or transformers. Maximum power loss is 11 W, so heat rejection inside the enclosure stays manageable.
Panel fit and environmental limits
The breaker measures 70 mm deep by 76.2 mm wide by 130 mm tall — a standard 3-pole MCCB footprint that drops into most SENTRON panelboards and DIN-rail adapters without re-drilling gland plates. Front face carries IP40 protection, enough for a clean indoor panel; no IP rating on the sides or rear, so keep clearance to live busbars per IEC 60947-2. Operating range spans -25 °C to 70 °C; storage from -40 °C to 80 °C.