What this 160 A MCCB carries and where it fits
The Siemens 3VA1216-4GF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 160 A continuous current at 40 °C, with four poles and a TM240 thermal-magnetic overcurrent release. It is configured for line protection — meaning it sits at the feeder or main distribution point, not downstream as a motor-protective device. The 121 kA breaking capacity at 240 V AC (75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, 11.9 kA at 690 V) gives it the interrupting capability for high-fault industrial services where the available short-circuit current is substantial. The 160 A rating holds flat from 40 °C through 50 °C, then derates linearly to 142 A at 70 °C — a useful thermal curve for panels that run warm. The rated insulation voltage is 800 V, and the maximum DC operational voltage is 600 V, so it can serve in DC distribution or battery-bank applications within those limits. The N-conductor is protected at 100% rating, meaning the neutral pole carries the same continuous current as the phase poles. Physically it measures 158 mm tall, 140 mm wide, and 70 mm deep — a 4-pole frame that fits standard SENTRON 3VA panel cutouts. The front face carries IP40 protection (finger-safe, not sealed), so it belongs in an enclosed switchboard or panel, not a washdown environment. The TM240 release is a thermal-magnetic type — the thermal element handles overloads, the magnetic element handles short-circuits — with a fixed magnetic trip threshold set at 240 A (±20%).
Breaking capacity by voltage — selectivity headroom
The interrupting ratings span the common industrial voltages: 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. These are the ultimate short-circuit breaking capacities (Icu) per IEC 60947-2. For a site electrical engineer checking selectivity coordination, the 75.6 kA at 415 V is the figure that governs most European 400 V distribution panels — it gives headroom above typical transformer-fed fault levels (often 25–50 kA at the main switchboard). The 690 V rating of 11.9 kA is lower but still adequate for most 690 V motor control centers.
Optional motor drive and communication
The product extension field notes that a motor drive is available as an option — meaning this breaker frame accepts a remote-operated motor mechanism for electrical closing and opening, useful in SCADA or remote-controlled distribution. The communication function is listed as No, so this base variant does not include a communication module; if bus connectivity (PROFIBUS, PROFINET, Modbus) is required, a different 3VA variant with the communication option would be needed.
Power loss and environmental limits
Maximum power dissipation is 33 W at rated current — relevant for thermal calculations inside a sealed enclosure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum of -40 °C means it can sit in an unheated warehouse through winter without damage.