When power to an induction motor is disconnected and then re-connected, the shaft experiences a potentially harmful transient torsional stress. The magnitude of the transient shaft stress depends on the electromagnetic torque of the motor and the resonant frequency of the system formed by the shaft and motor and load masses. To avoid resonance between transient electromagnetic torque frequencies and the mechanical natural frequency, the shaft may be de-tuned. This paper shows quantitatively the extent of worst-case resonant torques, the effect of an enforced reclosure time delay and the mitigating effects of altering the shaft resonant frequency to avoid high stresses. Peak shaft reclosure torque, when de-tuned, is independent of most motor parameters.