Line protection breaker with TM220 release
The Siemens SENTRON 3VM1163-4EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, with a TM220 thermal-magnetic overcurrent release. It is rated 63 A at 40 °C and carries a maximum breaking capacity of 121 kA at 240 V AC — the figure that governs fault interruption at the most common industrial distribution voltage. At 415 V AC the capacity is 76 kA, and it derates further to 12 kA at 500 V AC, so the voltage of the fault point determines whether this breaker clears a high-energy arc without cascading upstream.
Thermal derating and panel integration
The 63 A rating holds flat from 40 °C through 50 °C, then begins a gradual derating curve: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. In a sealed enclosure with poor airflow, the effective continuous current is the derated value at the internal ambient, not the nameplate 63 A. The breaker occupies a 76.2 mm wide by 130 mm tall footprint with a 70 mm depth behind the panel — standard for a 3-pole MCCB in this class, so it drops into a DIN-rail or backplate layout sized for a SENTRON 3VA or 3VM frame without re-drilling.