The Siemens 3VA1140-4EE36-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 40 A continuous rating at 40 °C and breaks up to 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — the interrupting capacity drops to 11.9 kA at 500 V and 690 V, so verify your fault level at the service voltage.
Ratings and fit
Three poles, 40 A frame, with a TM220 thermal-magnetic overcurrent release. The 40 A rating holds steady up to 50 °C; at 55 °C it derates to 39 A, and at 70 °C to 37 A — useful if the breaker sits in a warm enclosure near other heat sources. The rated insulation voltage is 800 V, so it's comfortable on 400/480 V systems with headroom. The 70 mm depth and 76.2 mm width fit standard 3-pole MCCB panel cutouts; it's not a compact form factor but it's a common footprint for this class.