The Siemens 3VA2216-5HL32-0DH0 is a 3-pole SENTRON molded case circuit breaker rated for 160 A continuous current at 40 °C, with an interrupting capacity of 187 kA at 240 V. That 187 kA figure drops to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and finally to 5.1 kA at 690 V — the SCCR curve tells you where this breaker has real fault-clearing headroom and where it doesn't.
Thermal derating — the real continuous rating at your panel temp
At 55 °C it derates to 154 A, at 60 °C to 148 A, at 65 °C to 142 A, and at 70 °C to 136 A. If your panel ambient runs 65 °C, you're sizing for 142 A continuous, not 160 A.
Physical fit — panel cutout and mounting
The undervoltage release and ETU320 are factory-integrated, so no field-kit assembly needed.