63 A MCCB with ETU310M — motor protection design
The Siemens 3VA2163-0MS36-0AA0 is a SENTRON 3-pole molded case circuit breaker rated for 63 A continuous current, with an electronic ETU310M overcurrent release designed specifically for motor protection duty. It carries a full 63 A from 40 °C through 70 °C ambient — no derating needed across that span, which simplifies panel layout in warm enclosures. The interrupting capacity is 440 kA at 415 V AC and 187 kA at 690 V AC, giving it headroom for high-fault installations like transformer secondaries or large motor control centers.
The 105 mm width and 181 mm height are standard for this frame size — it occupies the same footprint as other 3VA2 breakers, so a panel laid out for a 3VA2 family member accepts this unit without re-drilling. The 86 mm depth includes the handle and arc chamber; verify clearance to the enclosure door for handle operation.