What this 200 A MCCB carries and where it fits
The Siemens SENTRON 3VA1220-5GF42-0AJ0 is a 200 A, 4-pole molded case circuit breaker (MCCB) built for line protection in distribution panels. Its interrupting ratings step down cleanly from 187 kA at 240 V to 121 kA at 415 V, then 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — so the 415 V figure is the one to check against your transformer secondary or bus fault current. The TM240 thermal-magnetic release handles overloads and short circuits; no undervoltage release or ground-fault monitoring on this variant, and no communication module. Rated insulation voltage is 800 V, and the auxiliary switch configuration comes as 2 auxiliary switches plus 1 trip alarm switch HP. Current-carrying capacity holds at 200 A from 40 °C through 50 °C ambient, then derates to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. If your panel ambient runs above 50 °C, that derating curve is the real limit — not the nameplate 200 A. Maximum power loss is 42 W.
Panel fit and mechanical integration
Dimensions: 158 mm height, 140 mm width, 70 mm depth. The 4-pole body is wider than a 3-pole equivalent — check your DIN-rail or mounting-plate space before committing the panel layout. The supplied basic switch is order code 3VA12205GF420AA0, which is the internal switching mechanism; the full breaker ships as the assembled unit. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.