Question 339Electricity/Electronics - QMED70% to pass
What does the symbol labeled "OL" represent as shown in the power circuit on lines T1 and T3 to the motor as shown in figure "A" of the illustration? Illustration EL-0011
AI Explanation
The correct answer is C) overload relay thermal heater.
The "OL" symbol on lines T1 and T3 in the power circuit diagram (figure "A") represents the overload relay thermal heater. The overload relay is a protective device that monitors the current flowing through the motor circuit. If the current exceeds a certain threshold, indicating an overload condition, the thermal heater will cause the overload relay contacts to open, interrupting the power supply to the motor and preventing potential damage.
The other options are incorrect because: A) a fusible link is a different type of protective device, B) the overload relay contacts are normally closed, and D) the magnetic coil is a separate component within the overload relay assembly.
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