Provide solutions associated with grounding of separately derived systems.
‘Overlapping’ is the operative word. ASCO’s overlapping switched neutral design is all about timing. It makes before it breaks in advance of the breaking of the main and even arcing contacts. It’s a superior solution for a number of problems:
• “Inaccurate sensing of ground faults due to multiple fault current paths.
• Load voltage imbalances during transfer that can damage sensitive electronic equipment.
• Increasing neutral conductor impedance and related voltage and heating issues caused by switching neutral currents with conven- tional power switching poles.
• Arcing and consequent deterioration of the contact surface on the neutral pole.
As with conventional four pole power switching, the ASCO overlapping switched neutral has the same full-load current, withstand rat- ings as the phase contacts. But the similarities end there.
Neutral switching contacts are not created equal. Those that do not overlap the main pole contact operation cannot prevent neutral conductor interruption, even if they are ‘adjusted’ to break after and make before the main poles. ASCO overlapping neutral poles have a unique overlapping design. They are not a modification of a conventional pole design.
ASCO introduced the first true overlapping switched neutral.