Emergency lighting supply unit for manual testing, compatible with all electronic ballasts (dimmable and non-dimmable). It can also be used in combination with conventional magnetic ballasts. It is designed with 5-pole technology, 4-pole lamp changeover and delayed power switching for the ballast. It offers optimised AC output voltage suitable for TC-DD and TC-L lamps, optimised DC output voltage for T8 lamps. It features cathode heating adapted for compact lamps, switchover relay with high-current contacts, IDC (insulation displacement connection), green charge status display LED. By interrupting the unswitched phase, emergency lighting function can be checked. It comes with optional test switch, deep discharge protection, battery connection, short-circuit protected (not reversible) and polarity reversal protection for battery.