Electrician Red Seal · Question
You are commissioning a soft starter for a 10 kW (15 hp) motor. The motor is connected for 600 V AC. What is a primary advantage of using a soft starter compared to a direct-on-line (DOL) starter for this application?
Soft starters gradually ramp up the voltage and current to the motor, thus reducing the high inrush current, voltage dips, and mechanical shock typically experi
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Question: You are commissioning a soft starter for a 10 kW (15 hp) motor. The motor is connected for 600 V AC. What is a primary advantage of using a soft starter compared to a direct-on-line (DOL) starter for this application?
Answer options:
- It significantly increases the starting torque of the motor. ✅ It reduces the inrush current and mechanical stress during motor startup.
- It completely eliminates the need for overload protection.
- It allows the motor to operate at variable speeds.
Correct answer: It reduces the inrush current and mechanical stress during motor startup.
Explanation: Soft starters gradually ramp up the voltage and current to the motor, thus reducing the high inrush current, voltage dips, and mechanical shock typically experienced with a direct-on-line start.
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