Tapped winding, low and high speed,
Non-reversing, 3 speeds, 2 windings [t-head1-pg]

Multi-speed contactor U3PIL [t-head3]

Multi-speed contactor U3PIL without overload relay → figure

Synchronous speed

Rating of switchgear

F2, Q17: I₁ (low speed)

F3, Q11: I₂ (medium speed)

F4, Q21: I₃ (high speed)

Q23 : 0.5 × I₃

Function [t-head3]

Pushbutton I energizes mains contactor Q17 (low speed), pushbutton II mains contactor Q11 (medium speed), pushbutton III star contactor Q23 and via its normally open contact Q23/14–13 mains contactor Q21 (high speed). All contactors maintain themselves by their auxiliary contact 13–14.

Speed sequence from low to high is optional. Switching in steps from high to medium or low speed is not possible. The motor is always switched off by pressing pushbutton 0. In the event of an overload, normally closed contact 95–96 of overload relays F2, F21 and F22 can also switch off.