Voltage control

Cascade operation

Pole changing control

Supply frequency control

Equal currents with balanced loads

Different currents with balanced loads

Equal currents with unbalanced loads

Different currents with unbalanced loads

Phase relation

Phase sequence

Single phasing

Phase distortion

Protects the motor by stopping automatically under balanced load

Provides three phase supply in sequence order

Prevents the motor from short circuit fault

Prevent the motor from over load

Mechanical single phasing preventor with bimetal relay

Mechanical single phasing preventer with coils

Voltage sewing single phasing preventer

Current sewing single phasing preventer