The Siemens SENTRON 3VA2063-5JQ32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current and built for line protection duty. The interrupting ratings are the headline here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 3.4 kA at 690 V — so it handles high fault currents at the common low-voltage distribution levels without needing an upstream current-limiting fuse. The ETU560 electronic trip unit gives you adjustable long-time, short-time, and instantaneous protection curves, plus ground-fault detection via summation current on the L-conductor. That makes it a fit for main or feeder breakers in switchboards where selectivity and coordination matter.
What the ratings mean for fit
The 63 A frame carries full rated current up to 50 °C ambient; above that it derates linearly to 53.55 A at 70 °C. If your panel runs hot — say near a drive cabinet or in a non-climate-controlled enclosure — check the thermal derating curve at your actual ambient. The 800 V rated insulation voltage (Ui) means it's suitable for 480 V and 600 V class systems with margin. The 20 000 latching endurance cycles cover the mechanical life; electrical endurance will be lower at full rated current, but for a main breaker that sees infrequent switching, that's not a constraint. The 86 mm depth, 105 mm width, and 181 mm height are the standard 3VA2 frame dimensions. It mounts on a DIN rail or can be screw-fixed to a backplate. The 2 HQ auxiliary switches (3VA9608-0BB11) and the integrated undervoltage release (UVR) are factory-fitted — no field assembly needed for those options. The communication function (likely via the ETU560's optional module) allows remote monitoring of trip events and load current, which is useful for a managed distribution panel.