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- First Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q517 - Electrical, Electronic, & Control Engineering
303. 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
The 'OL' symbol in the power circuit represents the overload relay thermal heater, which senses overcurrent by heating a component and is distinct from fuses, contacts, or coils.
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