What this MCCB carries — and what it doesn't
The Siemens 3VA1220-5GF42-0CA0 is a 4-pole SENTRON molded case circuit breaker rated 200 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). Interrupting capacity hits 187 kA at 240 V and 121 kA at 415 V — figures that cover most industrial panel secondary-side faults without cascading upstream. No communication module, no ground-fault monitoring, no auxiliary contacts on this variant; it's a straight line-protection block with a UVR coil for safety circuits.
Thermal derating and real-world current
The 200 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 194 A, at 60 °C to 188 A, at 65 °C to 182 A, and at the 70 °C operating maximum to 176 A. If your panel ambient runs above 50 °C, the load current needs to stay under the derated figure — not the nameplate 200 A.
Interrupting capacity across voltage bands
187 kA at 240 V is the headline number; at 415 V it's 121 kA, at 440 V it drops to 36 kA, and at 690 V it's 17 kA. The 800 V rated insulation voltage (Ui) means the breaker is physically built for 690 V systems, but the fault-clearing capability shrinks as voltage rises — a common pattern on MCCBs with thermal-magnetic releases.
Mechanical endurance and N-conductor protection
Rated for 15,000 mechanical operations — not a high-cycle switching device, but adequate for backup protection in a distribution panel. N-conductor protection is set at 100%, meaning the neutral pole is fully rated rather than reduced-section. The front face carries IP40 protection, so it's suited for indoor panel mounting with no washdown exposure.