Different models available. In only off model it switches off motor once the water level reaches the high level of over head tank (OHT) Then we have to press the push button for starting the motor, where as in automatic model it switches on the motor, When the water level is low and switches off motor when the water level is high. We can put directly upto 1.5 HP motor. For sumps, submersible motor pump, and 3 Phase motor different models are available