What you're looking at
This is a Siemens SENTRON 3VA1220-6MH32-0CA0 molded case circuit breaker — 3-pole, 200 A continuous, with a TM120M thermal-magnetic trip unit. The 200 A rating holds flat from 40 °C up to 50 °C; above that it derates smoothly to 176 A at 70 °C, so in a hot enclosure you still have margin on a 175 A load.
What the interrupting ratings mean on your line
The 154 kA at 415 V is the headline number, but the full curve matters: 220 kA at 240 V, 75.6 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V. For a standard 400 V distribution board this breaker gives you selectivity headroom down to the sub-feed.
The undervoltage release (UVR) is built in as a factory-fitted auxiliary release, so if you lose control voltage the breaker trips — no separate shunt trip module to wire.
