The Siemens SENTRON 3VA1220-4GE42-0AA0 is a 4-pole molded case circuit breaker rated for 200 A continuous at 40 °C — that's the full-load current it can carry without tripping in a typical 40 °C panel ambient. The TM220 release means the thermal-magnetic trip is fixed at 200 A (the '220' code), so there's no adjustment dial; it's sized for a specific feeder or main. Breaking capacity hits 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that cover most low-voltage distribution fault levels in North American and IEC installations. At 690 V it still interrupts 11.9 kA, which matters for industrial systems with step-up transformers or VFD line reactors.
At 45 °C the breaker still holds 200 A; at 55 °C it derates to 194 A, at 65 °C to 182 A, and at 70 °C to 176 A.
What it protects and how it trips
Designed for line protection — feeder or main breaker duty in distribution panels. The TM220 release combines a thermal bimetal for overload (inverse-time, slow enough to start motors) and a magnetic coil for short-circuit (instantaneous above the magnetic pickup).