63 A MCCB for line protection — what the ratings mean
The Siemens 3VA2063-5KQ36-0AA0 is a SENTRON molded case circuit breaker rated for 63 A continuous current across the full ambient temperature range from 40 °C through 70 °C — no derating needed up to that ceiling. Three poles, designed specifically for line protection (cable/feeder protection, not motor branch). The 800 V rated insulation voltage gives headroom for 480 V and 600 V class systems. Breaking capacity is the headline number that determines where this breaker lives in the distribution hierarchy: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V is a high-interrupting rating — this breaker can sit close to a large transformer or generator where fault current is severe, without needing a current-limiting upstream device. The 3VA2063-5KQ36-0AA0 includes an onboard communication function and ground-fault monitoring (summation current formation on the L-conductor). That means it can report status and alarm conditions to a PLC or BMS over the SENTRON bus system — useful for remote trip indication and selective coordination in a monitored distribution panel.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep.
How this compares to the 3VA1110 sibling
The 3VA1110-5EE36-0AA0 is a lower-frame 3VA breaker with a 100 A frame and lower interrupting capacity. The 3VA2063-5KQ36-0AA0 sits on a 250 A frame (the '2063' in the order code) with the higher 63 A trip unit and the 187 kA breaking class. Physically, the 3VA2063 is wider (105 mm vs 70 mm for the 3VA1110) and taller — it will not drop into a panel cutout designed for the 3VA1110 without modifying the mounting plate or DIN-rail position. The communication and ground-fault monitoring features are similar across the family.