What this MCCB is and what the ratings mean for your panel
The Siemens 3VA1196-5GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — the primary role is protecting cables and busbars, not motor circuits, so the thermal-magnetic TM220 release is tuned for the inrush characteristics of distribution feeders rather than motor starts. Rated 16 A continuous at 40 °C ambient, and it holds that rating flat through 55 °C; at 60 °C it derates to 15 A, and at 70 °C it's still 15 A — so in a hot panel near the top of a cabinet, you don't lose headroom until you're past 55 °C. Breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 187 kA at 240 V means it can interrupt a fault current that high without venting or cascading upstream — useful on high-capacity transformer secondaries or near large motor banks where available fault current is stiff. Four poles give you switched neutral or three-phase-plus-neutral protection in a single unit, which saves DIN rail space compared to a 3-pole MCCB plus a separate fused neutral block.
Panel fit and integration
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — the 4-inch width is standard for a 4-pole 3VA frame, so it drops into existing SENTRON backpanels without re-drilling gland plates. IP40 on the front means it's protected against tools and wires larger than 1 mm, but not sealed against dust ingress — mount it inside a cabinet, not exposed to washdown. Power loss is 10.6 W maximum at rated load — negligible for thermal budgeting inside a ventilated enclosure, but worth noting if you're packing a row of these in a sealed stainless box.