What this MCCB does and why the ratings matter
The SENTRON 3VA2063-5JQ32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated at 63 A continuous, with a full-scale current of 63 A and an initial trip threshold of 16 A. It's designed for line protection — meaning it sits on the feeder or main distribution side, not downstream on a motor branch. The interrupting ratings tell you where it can clear a fault: 187 kA at 240 V AC, 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 the headline number — it's high enough for most low-voltage switchgear applications where available fault current is substantial. The 3 kA at 690 V is a reminder that at higher voltages the arc energy is harder to extinguish, so the breaker is really sized for 240–500 V distribution. Thermal performance is flat across the board: 63 A from 40 °C all the way up to 70 °C ambient. That means no derating curve to calculate for a warm panel — the breaker holds its full rating at 70 °C. Maximum power loss is 5.4 W, which is modest for a 63 A frame; it won't drive up the enclosure's internal temperature noticeably.
Mounting and panel fit
Dimensions are 181 mm high, 105 mm wide, 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame — it fits the same DIN-rail or screw-mount pattern as other 3VA2 breakers. The 86 mm depth leaves room for rear busbar connections in a typical distribution panel.
Built-in communication and auxiliary switching
The breaker includes a communication function — that means it can report status or accept remote commands via the SENTRON communication modules (not included in this base order code). The three HQ auxiliary switches provide remote indication of the main contact position. There is no undervoltage release and no voltage-trigger function on this variant, so it's a straight thermal-magnetic trip unit with add-on signaling.