What this 3VA1 breaker carries
The Siemens 3VA1580-5EF32-0CL0 is a 3-pole IEC frame 1000 circuit breaker rated 800 A continuous, with a 55 kA interrupting capacity at 415 V (breaking capacity class M). The TM240 thermal-magnetic trip unit gives overload protection adjustable from 560 A to 800 A (Ir), and short-circuit protection fixed at 5× In (Ii = 4000 A). The ATAM designation indicates the trip unit is adjustable, thermal-magnetic, with a specific time-current curve profile for line protection — typical for main feeders or large motor control center incomers where you need selectivity with downstream breakers.
Integrated accessories — what's on board
The UVR drops the breaker on loss of control voltage — standard for emergency-stop chains or undervoltage protection on motor feeders.