What this MCCB carries and where it fits
The Siemens SENTRON 3VA1216-4EF32-0KA0 is a 3-pole molded case circuit breaker (MCCB) built for line protection in distribution panels. It carries a TM240 thermal-magnetic release — the thermal element handles overloads, the magnetic element trips on short-circuit — and a factory-fitted shunt trip (STL) for remote or emergency-off opening. The 160 A continuous rating holds flat from 40 °C to 50 °C, then derates to 142 A at 70 °C, which matters for a packed enclosure where ambient climbs. Interrupting capacity runs 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V — so it handles high-fault utility feeds downstream of a transformer.
Panel fit and wiring
The breaker measures 105 mm wide by 158 mm tall by 70 mm deep — a standard 4-module footprint on the DIN rail. The shunt trip coil draws power from a separate control circuit; verify the voltage rating of the STL against your control transformer before wiring. Rated insulation voltage is 800 V, so it's comfortable on 480 V or 600 V class systems. Power loss maxes out at 33 W at rated load — account for that heat in the enclosure thermal calculation if you're stacking breakers tight.