What this 3VA1116-4EF32-0AB0 is and what it does
The Siemens SENTRON 3VA1116-4EF32-0AB0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 160 A rating at 40 °C ambient, with a TM240 thermal-magnetic release that handles overload and short-circuit protection in one unit. The 121 kA breaking capacity at 240 V AC means this breaker can safely interrupt very high fault currents without upstream devices needing to clear the fault — a key spec for high-available-fault-current installations like industrial mains or transformer secondaries.
Breaking capacity across voltages — where it fits
Breaking capacity drops as system voltage rises: 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 11.9 kA at 690 V is the limiting case — if your panel is fed from a 690 V transformer with a high fault current, this breaker may not clear it. At 240 V, 121 kA is generous; at 480 V, the 75.6 kA figure still covers most North American industrial services. The 800 V rated insulation voltage confirms the internal clearance and creepage are sized for 690 V systems.
Thermal derating and panel integration
Rated current holds flat at 160 A from 40 °C through 50 °C, then derates to 158 A at 55 °C, 155 A at 60 °C, 153 A at 65 °C, and 150 A at 70 °C. In a sealed, uncooled enclosure that sees 60 °C internal ambient, you lose 5 A — not much, but worth checking if you are running at the edge of the breaker's rating. The 76.2 mm width (3 in) and 70 mm depth (2.76 in) fit standard MCCB panel cutouts; the 130 mm height (5.12 in) is typical for this frame size. Maximum power dissipation is 38 W — plan ventilation if multiple units are ganged in a small enclosure.