Siemens SENTRON 3VA2063-7KQ42-0DA0 — 63 A MCCB for Line Protection
The Siemens SENTRON 3VA2063-7KQ42-0DA0 is a 4-pole molded case circuit breaker rated for line protection, with a full-scale current of 63 A that holds flat from 40 °C through 70 °C — no derating needed across the typical panel ambient range. Its interrupting capacity reaches 330 kA at 240 V and 242 kA at 415 V, which means it can clear a fault at full available short-circuit current on a high-capacity transformer secondary without upstream coordination issues. The breaker includes an undervoltage release and a ground-fault monitoring function using summation current formation on L+N conductors, so it can serve as both a line protector and a personnel-safety device in a single enclosure.
Panel Fit & Integration — 4-Pole Footprint with Communication
At 140 mm wide, 181 mm tall, and 86 mm deep, this MCCB occupies a standard 4-pole molded-case footprint on the DIN rail or panel-mount backplate. A communication function is built in, so it can report status and trip events to a higher-level control system without an external add-on module. Maximum power loss is 5.5 W, which keeps internal panel temperature rise manageable even in a densely populated enclosure.
Ratings That Matter for Selectivity and Coordination
The adjustable thermal-magnetic trip range spans from a minimum of 95 A to a maximum of 756 A, with an initial value of 16 A — this lets the breaker coordinate with downstream feeders while maintaining full short-circuit protection. At 690 V the interrupting rating drops to 3 kA, so this breaker is best applied on 240–500 V systems where the high kA ratings are available; for 690 V applications a different frame or series would be needed.