The 3VA1216-6GF42-0AA0-ZD00 is a Siemens 3VA1 IEC frame 250 circuit breaker carrying a 70 kA breaking capacity at 415 V (class H). The 4-pole construction with 100% N-conductor protection means the neutral pole opens and closes with the phases, not just a switched neutral; this matters for TN-S or IT systems where the neutral must be disconnected during isolation.
The TM240 thermal-magnetic trip unit is rated In = 160 A, with overload protection (Ir) adjustable from 112 A to 160 A via a dial on the front face. That adjustability lets the breaker be coordinated downstream of a larger feeder without swapping the trip unit — useful when the load is a fixed 125 A motor but the cable is sized for 160 A. The magnetic trip responds instantaneously to short-circuit events; the thermal element handles overloads with an inverse-time curve. This is a line-protection breaker, not a motor-protection breaker — it does not carry an overload relay class (Class 10/20) and is intended for cable and busbar protection rather than direct motor starting.