Siemens 3VA1020-4ED36-0CC0 SENTRON MCCB, 20 A, 121 kA at 240

It carries a 20 A continuous rating across ambient temperatures from 40 °C to 50 °C without derating, then steps down to 18 A at 70 °C — a curve that matters when the breaker lives next to hot busbars in a sealed enclosure. Breaking capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and still holds 11.9 kA at 690 V — figures that cover most low-voltage fault scenarios in mining and mill distribution without needing a current-limiting upstream device. The TM210 thermal-magnetic trip unit handles overload and short-circuit protection; no electronic communication or phase-failure detection here — it's a pure protective device, not a monitoring node.