The Siemens 3VA1332-6EE32-0AA0-ZD00 is a 3-pole IEC frame 400 molded case circuit breaker from the 3VA1 series, rated for line protection with a TM220 thermal-magnetic trip unit. Its headline breaking capacity is Icu=70kA at 415V (class H), which means it can safely interrupt fault currents up to 70,000 A without damage — critical for high-fault installations like industrial switchboards or mill feeders where upstream transformers are large. Overload protection is adjustable Ir=224A to 320A, and short-circuit protection is fixed at Ii=10 x In (3,200 A). The nut keeper kit included is for DC Power OEM builds in China.
What the Ratings Mean for Fit
The 70 kA Icu at 415 V is the key selection parameter: it tells you this breaker can handle high available fault current typical of a 2 MVA transformer secondary. The TM220 trip unit provides thermal (overload) and magnetic (short-circuit) protection in one package — the thermal element is adjustable from 224 A to 320 A, so you dial in the exact cable or bus rating. Fixed magnetic pickup at 10 x In means instantaneous trip at 3,200 A, which is standard for motor branch circuits or feeder protection where high inrush is expected.