The Siemens 3VA1220-5EF42-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A continuous current at 40 °C, with a breaking capacity of 187 kA at 240 V — that's the short-circuit rating that determines if this breaker clears a fault without upstream coordination issues. It's a 4-pole unit designed for line protection, meaning it protects downstream cables and buswork, not motor loads.
Ratings and what they mean for fit
The 200 A rating holds across 40 °C to 50 °C ambient — no derating needed in a warm panel. Above that it drops to 194 A at 55 °C and 176 A at 70 °C, which is the operating limit (cites:-). The insulation voltage is rated 800 V, so it can sit on a 690 V system with margin (cites:). Breaking capacity steps down with voltage: 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — the 187 kA at 240 V is the headline number for high-fault panels (cites:-). Power loss at full load is 44.5 W, which matters for heat buildup in a sealed enclosure — factor that into your thermal calc (cites:). The auxiliary switch configuration is 2 aux switches plus 1 trip alarm switch (HQ designation), and the undervoltage release (UVR) is built in, so it drops the breaker on loss of control voltage (cites:,).
Mounting and integration
Dimensions: 140 mm wide, 158 mm tall, 70 mm deep — it's a 4-pole frame so the width is the key fit check for DIN-rail or panel-mount spacing (cites:-). The trip indicator and undervoltage release add wiring points; the design includes 2 auxiliary switches and 1 trip alarm switch that need to be accounted for in the control schematic (cites:,).