It includes phase failure detection, so if one phase drops out, the breaker trips before single-phasing damages the motor winding.
That 50 mm vertical gap is the minimum for arc-chamber venting and terminal access — don't crowd it against a gland plate or busbar.
Environmental and electrical ratings
Rated operational voltage spans 20 to 690 V. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120/125/230 V, 0.15 A at 60 V. The 690 V main circuit uses gL/gG 6 A fuse backup.
