The Siemens SENTRON 3VA1220-4GF42-0AE0 is a 4-pole molded case circuit breaker (MCCB) rated at 200 A continuous current, fitted with a TM240 thermal-magnetic overcurrent release. It is designed for line protection in distribution panels and switchgear assemblies where a fixed, non-adjustable trip curve is acceptable.
Breaking capacity and selectivity
Rated interrupting capacity reaches 121 kA at 240 V AC, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. These values govern fault-clearing capability at the point of common coupling — match them against the available fault current at the breaker's installation point to confirm adequate SCCR headroom for downstream coordination. Insulation voltage is rated at 800 V, so the breaker supports 690 V line-to-line systems with full dielectric margin.
Thermal derating curve
At 40 °C, 45 °C, and 50 °C the breaker carries its full 200 A rating. Derating begins at 55 °C (194 A), then 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. Panel ambient temperature inside the enclosure — not the room — is what determines the usable continuous current; a crowded cabinet at 60 °C knocks off 12 A from the nameplate.
Physical fit and integration
Dimensions are 158 mm high, 140 mm wide, and 70 mm deep. The 140 mm width for a 4-pole frame is standard for SENTRON 3VA molded case breakers at this rating — verify the mounting footprint against the existing backplate or DIN-rail adapter before committing the panel layout. Maximum power dissipation is 42 W. In a sealed, non-ventilated enclosure that heat must be accounted for in the thermal budget; adjacent devices may need spacing or forced airflow.