The Siemens SENTRON 3VA1220-5EF42-0AG0 is a 4-pole molded case circuit breaker rated for 200 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It's built for line protection duty — the kind of main feeder or heavy branch breaker you'd spec into a distribution panel where fault current is serious. Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and still 17 kA at 690 V. That means it can interrupt a massive fault without the arc blowing upstream — critical for transformer-secondaries or high-capacity bus risers where a smaller MCCB would cascade-fail. The 200 A rating holds flat from 40 °C to 50 °C, 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 hot, you'll need to size up or accept the lower continuous ampacity — no guessing.
Panel fit and wiring
Dimensions are 158 mm high, 140 mm wide, 70 mm deep — that's a standard SENTRON 3VA frame footprint. It'll drop into a DIN-rail or screw-mounted panel layout without re-drilling if you're swapping from another 3VA frame. The front face carries an IP40 rating, so keep it inside a cabinet; it's not a standalone weatherproof unit. The auxiliary contact block is populated: one auxiliary switch plus one trip alarm switch (HP type). That gives you a dry contact for status feedback to a PLC or annunciator without adding a separate module. No undervoltage release, no shunt trip, no ground-fault monitoring on this variant — if you need those, you're looking at a different suffix.