It is not a circuit breaker — there is no overload or short-circuit release inside. The description explicitly states 'without overload protection' and 'without short-circuit protection'. This part is a manually operated isolating switch that makes and breaks load current but does not protect the downstream cable or load from faults. The 2 kA limited short-time withstand rating (1 s and 0.5 s) means it can survive a fault current long enough for an upstream breaker to clear it, but it will not trip itself. The integrated undervoltage release (UVR) is wired for 208-230 V AC 50/60 Hz. If the control voltage drops, the UVR opens the disconnector — a standard safety feature for motor circuits where loss of control power should drop the load.
The main circuit connects via busbar connection at the front terminals — typical for a distribution panel where the disconnector feeds a busbar system rather than individual cables.