The Siemens SENTRON 3VA1163-1AA42-0CH0 is a 4-pole switch disconnector in the 3VA1 IEC frame 160 series, rated for 63 A continuous current (Iu). It provides no overload or short-circuit protection — its job is safe isolation under load, not circuit protection. The built-in undervoltage release (UVR) operates on 120–127 V AC 50/60 Hz, so if control voltage drops, the disconnector opens automatically, preventing a motor from restarting unexpectedly after a sag.
The unit measures 101.6 mm wide × 130 mm high × 70 mm deep. It uses a busbar connection for the main circuit, with front terminals — so it's designed for a fixed, screw-clamp busbar system, not plug-on DIN-rail.
The latching endurance of 15 000 cycles is mechanical; for frequent switching, factor in the electrical endurance (not listed here, but typically lower under full load).