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I understand the function for LAD9R1, LAD9R3...etc. What is the function of the high/low speed starter set ( LAD9PVGV )?

The reference LAD9R1 and LAD9R3 are the reverse connection kits for the contactors if you consider that the motor is a single speed motor.
If you need to design a dual speed motor Starter with reverse function,the kit LAD9PVGV comes very handy .

With this kit you can design a 2-speed reverse starter with 2 Nos 3 pole and 1No (4 pole ;2NO +2NC poles) power contactor.

The schematic Diagram and the instruction sheet for this reference are as attached.

Note:

PV and GV are symbolic for the Low speed and High speed respectively
PV : Petite vitesse
GV : Grand vitesse
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