The Siemens SENTRON 3VA2450-5KP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 500 A continuous current at 40 °C, with an ETU850 electronic trip unit covering an adjustable overload range from 750 A to 7 000 A. It delivers 187 kA interrupting capacity at 240 V AC, stepping down to 121 kA at 415/440 V, 75.6 kA at 500 V, and 9 kA at 690 V — enough headroom for most industrial service-entrance or feeder applications.
The 500 A continuous rating holds flat from 40 °C up to 50 °C, then derates to 477 A at 55 °C, 455 A at 60 °C, 432 A at 65 °C, and 410 A at 70 °C. If your panel ambient sits at 50 °C, you get the full 500 A; above that, the thermal curve governs the real load you can pass without nuisance tripping. The adjustable trip range (750 A minimum, 7 000 A maximum) means the ETU850 can be dialed to match the cable and load — useful when the same breaker frame covers multiple feeder sizes in a build. Interrupting capacity at 240 V hits 187 kA — that is well above typical utility fault levels in North American 120/208 V or 277/480 V panels, so you get selectivity headroom without oversizing the frame.
Integration and physical fit
The 3VA2450-5KP42-0AA0 measures 248 mm high, 184 mm wide, and 110 mm deep — a standard MCCB footprint for a 500 A frame. The 4-pole configuration handles three-phase loads plus neutral switching, common in generator paralleling or IT-system distribution. Communication function is built in, so it can report status and trip events to a higher-level control system without an add-on module.