Only for Fluxpower HE 30-40kVA with back-feed protection option:
The load remains fed by the manual
bypass switch. LED #8 off.
The bypass line is disconnected.
The display goes out.
The load is supplied directly by the mains
through the manual bypass switch. The
UPS is isolated.
Sectioning phase R - Power supply
contactor back-feed / relay contact RL1
PB244 back-panel board