What this MCCB is and what it does
The Siemens 3VA2216-7MN32-0BA0 is a SENTRON molded case circuit breaker (MCCB) designed for motor protection in industrial control panels. It carries a flat 160 A rated current across the full 40-70 °C ambient range, meaning no derating is needed as the panel warms up — that's unusual for a breaker this size and simplifies the thermal calc for the panel builder. The 3-pole unit breaks up to 330 kA at 240 V and still holds 242 kA at 415/440 V, so it handles high-fault scenarios on the line side of a motor starter without cascading upstream.
Key ratings and what they mean for fit
Breaking capacity is the headline: 330 kA at 240 V AC, 242 kA at 415/440 V, 187 kA at 500 V, and 4.5 kA at 690 V. That 330 kA figure at 240 V is a high-interrupting rating — it tells you this breaker is meant for a strong source, like a transformer secondary or a generator bus, where fault current can exceed 100 kA. The drop to 4.5 kA at 690 V is a reminder that the same arc-extinction design has limits at higher voltage; if your system is 690 V, verify the available fault current is under that threshold. Trip time is adjustable between 4 s and 17 s, which is the long-time delay band for overload protection. That range suits motor starting inrush — a 160 A motor might pull 800 A for a few seconds during acceleration, and a 4 s minimum delay lets the breaker ride through a normal start without nuisance tripping. The 17 s maximum gives headroom for longer acceleration profiles on high-inertia loads like centrifuges or large fans. Power loss is 22.2 W maximum at rated load. That's moderate for a 160 A frame — it means the breaker dissipates heat into the enclosure, so if you're packing multiple units in a sealed cabinet, factor that into the thermal budget. The operating temperature range of -25 °C to 70 °C covers most indoor industrial environments, including unheated warehouses in winter.
Integration and mounting
The 3VA2216-7MN32-0BA0 mounts on a DIN rail or screw-fixed to a backplate. Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. The 86 mm depth fits in a standard enclosure without door interference. This variant comes with an undervoltage release (UVR) integrated — the auxiliary release type is listed as undervoltage release. That means if the control voltage drops below a threshold, the breaker trips, which is standard for safety circuits where a loss of control power must open the motor circuit. There is no auxiliary switch and no ground-fault monitoring on this version, so if you need those, look at the 3VA2 family with those options. Phase failure detection is built in, which is critical for motor protection — if one phase drops out, the breaker will trip on the resulting current imbalance before the motor overheats from single-phasing. The basic switch inside is order code 3VA2216-7MN32-0AA0, which is the core switching mechanism; the -0BA0 suffix adds the UVR and phase-failure electronics.