What this 4-pole 200 A MCCB is for
The Siemens 3VA1220-5GF42-0KC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 4-pole unit rated 200 A continuous — that's the full-load current it carries without tripping at 40 °C ambient. The 200 A rating holds steady up to 50 °C, then derates to 176 A at 70 °C. For a panel builder, that means you size your bus and downstream conductors for 200 A and get the full rating in most ventilated enclosures.
Breaking capacity — what it handles in a fault
The interrupting rating tells you the maximum fault current this breaker can safely clear. At 240 V it's rated 187 kA; at 415 V it's 121 kA; at 440 V it's 75.6 kA; at 500 V it's 30 kA; at 690 V it's 17 kA. Those numbers cover most industrial distribution scenarios — a 480 V panel with 65 kA available fault current is well inside the margin. The 690 V rating matters for 600 V class Canadian or mining installations.
Physical fit and auxiliary options
Dimensions are 158 mm high, 140 mm wide, 70 mm deep. That's a standard 4-pole MCCB footprint — it occupies roughly the same panel space as other 200 A 4-pole frames. The breaker ships with a shunt trip release (STL) and two HQ auxiliary switches built in. The shunt trip lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or interlocking with upstream gear. Rated insulation voltage is 800 V.