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All about Motors
Multi speed switch for three-phase motors
 
2 separate windings, non-reversing, 2 speeds
 
Multi-speed contactor UPDIUL, with fuses and overload relay
Klockner Moeller Multi Speed Switches
Circuit A
1 three-way pushbutton		 Circuit C
1 three-way pushbutton
Klockner Moeller Multi Speed Switches  Klockner Moeller Multi Speed Switches
Q17: Mains contactor, low speed
Q21: Mains contactor, high speed
Klockner Moeller Multi Speed Switches
Three-way pushbutton
I: Low speed (Q17)
0: Stop
II: High speed (Q21 + Q23)

Klockner Moeller Multi Speed Switches
Method of operation
Actuation of pushbutton I energizes the coil of contactor Q17. Q17 brings in the motor at low speed, and after pushbutton I is released, maintains itself via its auxiliary contact 13–14 and pushbutton 0.

Speed can be changed either after pressing pushbutton 0, or directly by pressing the appropriate pushbutton, depending upon the circuit. The motor is switched off either by pressing pushbutton 0, or in the event of an overload, by normally closed contact 95–96 of overload relays F2 and F21.

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