When a single-phase motor (such as the one used in electric blinds) is stopped and quickly reversed, it experiences a high inrush current. This happens because the motor is still in the process of reversing its magnetic field, which requires extra energy—especially in the starter winding.

This sudden surge in current can exceed the trip threshold of the circuit breaker, causing it to shut off power as a protective measure.

If the changeover time between directions is too short, it can lead to:

• Frequent nuisance tripping of the breaker
• Failure of the motor to reverse properly
• Potential overheating or damage to the motor

Solution:
To prevent these issues, increase the “changeover delay” according to the blind manufacturer's specifications. This allows the motor to come to a complete stop before reversing, reducing the inrush current and preventing breaker trips.

Released for: Schneider Electric Ireland