The Siemens SENTRON 3VA1220-5GF42-0CH0 is a 200 A, 4-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries an undervoltage release (UVR) as standard, which trips the breaker when supply voltage drops below a set threshold — useful for preventing motor re-acceleration after a brownout. Rated at 200 A continuous, it holds that rating from 40 °C up to 50 °C ambient, then derates linearly to 176 A at 70 °C. That thermal curve means you can push it harder in a cool cabinet or must derate in a hot enclosure — the 200 A nameplate is only valid up to 50 °C. Breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. For a 400 V class panel, that 121 kA at 415 V covers most high-fault installations — you'd need upstream current-limiting fuses only for exceptionally high available fault currents.
Dimensions and panel fit
Footprint is 140 mm wide × 158 mm tall × 70 mm deep. That 70 mm depth is shallower than many MCCBs in this current class — useful when mounting in a shallow enclosure or against a rear gland plate. The 140 mm width is standard for a 4-pole frame in the 3VA1 series, so it occupies the same DIN-rail or mounting-plate slot as other 4-pole SENTRON breakers.
Key ratings at a glance
Rated insulation voltage is 800 V, giving headroom for 690 V systems. Maximum power loss is 44.5 W at rated current — a factor for thermal management in a sealed enclosure. The breaker includes a trip indicator and accepts up to 2 auxiliary switches plus 1 trip alarm switch (HQ type), allowing remote status monitoring without an external relay.