AVO Substation Maintenance Practice Exam 2025 – Complete Prep Guide

Question: 1 / 400

What is one of the essential uses of a circuit breaker?

Store electrical energy

Open and close electrical circuits manually

The function of opening and closing electrical circuits manually is a critical role of a circuit breaker. This capability allows trained personnel to safely isolate parts of an electrical system for maintenance or repair, ensuring that work can be performed without risking exposure to live electrical components. The ability to manually operate the circuit breaker helps in controlling the flow of electricity and facilitates necessary interventions, such as troubleshooting or emergency shutdowns.

Moreover, while circuit breakers are designed primarily for protection against overloads and short circuits—automatically interrupting the circuit when faults occur—they also enable safe manual operation. This dual functionality is essential for the safe maintenance and operational integrity of electrical systems. Manual operation can also assist in routine operations where a temporary interruption of power is needed, such as during scheduled maintenance or testing.

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Regulate transformer efficiency

Monitor electrical loads

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