What this 800 A MCCB does on the line
The Siemens 3VA2580-7HK32-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for a continuous current Iu of 800 A, with an interrupting capacity of 242 kA at both 240 V and 415 V — enough to handle high-fault utility feeds or large motor branch circuits without cascading upstream. It carries an ETU340 electronic trip unit with adjustable long-time pickup Ir fixed at 800 A and instantaneous pickup li fixed at 8 000 A, so the protection curve is preset for a high-current distribution or feeder application.
Dimensions are 210 mm wide by 320 mm high by 120 mm deep — a substantial frame that bolts into a distribution board or switchgear lineup, not a snap-on DIN-rail unit. Front face carries IP40 protection, so it's suited for indoor panel environments where tools or fingers won't contact live parts during normal operation.
Rated continuous current holds at 800 A from 40 °C up to 60 °C ambient; above that it derates to 767 A at 65 °C and 703 A at 70 °C. Maximum power loss is 135 W, which factors into enclosure ventilation sizing.