What this 3VA1 breaker delivers
The Siemens 3VA1580-5EF32-0AB0 is a 3-pole IEC frame 1000 circuit breaker rated for 800 A continuous current, with a 55 kA breaking capacity at 415 V (class M).
Overload and short-circuit protection settings
It carries a TM240 thermal-magnetic trip unit with an adjustable overload protection range (Ir) from 560 A to 800 A, and a fixed short-circuit pickup (Ii) at 5 × In (4,000 A). The thermal element handles sustained overcurrents typical of motor or transformer inrush; the magnetic element clears hard faults fast. This adjustability lets the panel builder or site engineer dial in the exact protection curve for the downstream load without swapping trip units.