What this MCCB does on a line
The Siemens SENTRON 3VA2063-6HL32-0CL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed for line protection, meaning it sits at the feeder or sub-feed to protect cables and busbars, not a specific motor or load. The interrupting capacity runs 242 kA at 240 V, 187 kA at 415 V, and 121 kA at 500 V; at 690 V it drops to 3 kA, so keep that in mind if you are feeding a 690 V bus. This unit includes an undervoltage release (UVR) and a factory-fitted auxiliary switch block: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ designation). The basic switch assembly is order code 3VA20636HL320AA0. A trip indicator is present, and the power loss at full load is 7.9 W maximum.
Panel fit and dimensions
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That is a 4.13 by 7.13 by 3.39 inch footprint — standard for a 3-pole SENTRON MCCB in this frame size. Mounts on a DIN rail or direct-panel screw pattern; the auxiliary switch block adds no extra width, just depth behind the escutcheon.
Selectivity and coordination note
The 63 A continuous rating combined with the 242 kA interrupting capacity at 240 V gives solid selectivity headroom for a downstream panel. The minimum breaking current is 95 A, so it clears low-level faults cleanly. The storage range is -40 °C to 80 °C; operating range is -25 °C to 70 °C. No ground-fault monitoring or communication function is built in — this is a straight line-protection breaker with UVR and auxiliary signaling.