In the illustrated solid-state "soft"...

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Question 1 of 2066636eed28f7522a1c51d69d

In the illustrated solid-state "soft" starter for a three phase induction motor as shown in figure "A", what is the name of the devices that are controlled by the gate control circuits? Illustration EL-0060

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🔍 Key Concepts

• Soft starter operation using phase-angle control on each half-cycle of the AC waveform • Devices that require a gate signal to start conducting and can be turned on at a chosen point in the AC cycle • Difference between simple diodes and controlled rectifiers used in motor starters

💭 Think About

• Look closely at the symbol drawn for each device in figure A/C: does it show just a diode, or a diode with an extra terminal for control? • Which of the listed devices are specifically designed to be triggered by a gate signal and used in AC motor soft‑start circuits? • Which options are primarily used for voltage regulation or capacitance tuning rather than switching heavy motor currents?

✅ Before You Answer

• Verify which device type has a gate terminal and conducts only after being triggered • Eliminate any components that are not typically used for high‑power AC motor control • Confirm which component is commonly paired back‑to‑back for bidirectional control of AC in each phase, as shown in the illustration

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