What the ratings mean for your panel
The Siemens 3VM1140-4EE36-0AA2 is a SENTRON molded case circuit breaker (MCCB) on the 160 A frame, configured for line protection with a TM220 thermal-magnetic release. Rated continuous current is 40 A across the 40 °C to 50 °C ambient range, derating slightly to 39 A at 55 °C and 37 A at 70 °C. The thermal pickup Ir adjusts from 28 A to 40 A; the magnetic short-circuit pickup Ii is fixed at 10 × In. That 10× multiplier means instantaneous trip at 400 A — tight enough to ride through motor inrush on a 40 A feeder but still clear a hard fault fast. Breaking capacity is the headline here: 121 kA at 240 V AC, 76 kA at 415 V AC, and still 53 kA at 440 V. That class-S rating (36 kA Icu at 415 V per the description) puts it squarely in high-fault-duty panels — think industrial MCC lineups or transformer-fed sub-distribution where the available fault current pushes past 50 kA. At 500 V the rating drops to 11.9 kA, so verify your system voltage before committing. Rated insulation voltage Ui is 690 V, and max operational voltage Ue is 500 V AC 50/60 Hz. The 3-pole front-connection box terminals accept solid or stranded copper — standard for IEC panel builds. No auxiliary contacts, no motor drive, no ground-fault monitoring on this variant; it's a bare line-protection breaker.
Integration note
Mounts on a DIN rail or directly to a backplate via the molded case footprint. Front connection means the line and load lugs are accessible from the front — no rear-bus bar required. The IP40 front face is suitable for enclosed panel mounting; not rated for washdown or outdoor exposure. Keep the storage range (-40 °C to 80 °C) in mind for spares held in unheated warehouses.