The Siemens SENTRON 3VA1163-1AA42-0CA0 is a 4-pole switch disconnector in the 3VA1 IEC frame 160 design — rated 63 A continuous (Iu) with no integral overload or short-circuit protection, so it functions purely as a load-break isolating device, not a circuit breaker. It carries a factory-fitted undervoltage release (UVR) for 120-127 V AC 50/60 Hz, meaning the switch trips open on loss or drop of control voltage — a standard safety interlock for motor control centers or conveyor lines where a voltage-loss disconnect is required by the safety circuit.
What the ratings mean for fit
Rated insulation voltage (Ui) of 800 V and max operational voltage of 690 V AC / 600 V DC define the system voltage class it can sit in — suitable for 400/480 V panels with headroom. The 63 A continuous rating is the thermal current the main contacts carry without derating; in a switch disconnector with no overload trip, that 63 A is the absolute load limit, not a setting. The 4-pole configuration (3 phases + neutral) makes it a line-side isolator for 3-phase + N distribution. Front terminals accept busbar connection only — no lug or cable lugs on the main circuit without an adapter. IP40 on the front means the operator face is protected against tools >1 mm but not against water ingress; mount it inside a panel, not in a washdown zone.
Mounts on the panel backplate or DIN rail via the 3VA frame footprint. Dimensions: 70 mm deep × 101.6 mm wide × 130 mm tall. The 101.6 mm width (4-pole) is wider than a 3-pole 3VA frame (76.2 mm) — check gland-plate cutout and adjacent device spacing if retrofitting into a panel originally laid out for a 3-pole MCCB. Undervoltage release wiring: the leading-contact option is not fitted (No), so the UVR coil energizes immediately on control-voltage application; no time-delay dropout sequence.