What this 3VA1 breaker carries
The Siemens 3VA1332-5GF42-0AA0-ZD00 is a current-production IEC frame 400 molded case circuit breaker from the 3VA1 series, rated for 320 A continuous and breaking 55 kA at 415 V (class M). The TM240 thermal-magnetic trip unit gives an overload adjustment range Ir = 224 A to 320 A, and the instantaneous short-circuit pickup Ii is set between 5 and 10 times In — so you can dial the protection band to match the cable and load without swapping trip blocks. Four-pole construction with 100 % N-conductor protection means the neutral pole is fully rated and trips with the phase poles — essential for TN-S or TN-C-S systems where an open neutral cannot be tolerated.
At 55 kA Icu @ 415 V, this breaker coordinates cleanly with downstream 25 kA or 36 kA MCCBs in a selective system — the high interrupting capacity lets it serve as the main or tie breaker without cascading upstream.