What this MCCB is and what it handles
The Siemens SENTRON 3VA1196-4EF32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for 16 A continuous current at 40 °C, with the same 16 A rating holding steady through 55 °C before derating to 15 A at 60 °C and above. That means in a warm panel — say a motor control center running near 50 °C — you still get the full 16 A without having to oversize the breaker. Breaking capacity is 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA at 240 V tells you this breaker can handle a high-fault utility feed or a transformer secondary where the available short-circuit current is serious — it's not a light-duty panelboard breaker. Line-protection device with shunt trip release (STL) and two auxiliary switches HQ. Rated insulation voltage 800 V.
Mounting and panel fit
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. Those dimensions are standard for a SENTRON 3VA frame — it mounts on a DIN rail or directly to a backplate with the supplied screws. The 70 mm depth means it fits in shallow enclosures where a deeper MCCB would hit the gland plate or door. Width of 76.2 mm (3 inches) is a common footprint for a 3-pole MCCB in this class — no surprises when you're laying out a panel. The shunt trip and auxiliary switches add a bit of height on the side, but the base dimensions stay the same.