Direct On-Line (DOL) method is the simplest starting method for 3-phase pump set. L&T offers two variants of DOL method – starter and controller.

DOL starters are basic electrical starters with contactors and relay for ON/OFF operation and overload protection of the pump set.

Over and above the ON/OFF operation and overload protection features equipped in Controllers, it also provides additional features like Auto ON, indications of Supply ON/OFF and Pump ON/OFF, reading of real time voltage & current of pump with unique Dual analog meter.

Single phasing protection relay (SPPR) inside Controller unit provides the advanced protection features viz. single-phasing prevention, phase-reversal protection, phase-unbalance protection, variable time-delay adjustment for delayed operation of pump set

FASD Starters :

MK1 FASD – with MK1 contactors, MK1 relay and GT200 timer relay

MU FASD – with MU contactors, MU relay and ST100 timer

MB FASD – with MU contactors, MN relay and ST100 timer

ML FASD – with ML contactors, ML relay and ST100 timer

Controllers :

MU-G15 – with MK1 contactors, MK1 relay and SDz5 (SPPR + timer)

MU-G20 & MU-G20H – with MU contactors, MU relay and SDz5 (SPPR + timer)

MU-G30 – ML contactors, MN relay and SDz5 (SPPR + timer)

MU-G50 - ML contactors, MN relay and SDz5 (SPPR + timer)

MU-G75 - ML contactors, MN relay and SDz5 (SPPR + timer)