Technical Standards and Safety Authority (TSSA) G3 Practice Exam

What type of safety device is used to protect against overload?

1. Circuit breaker

2. Fuses

3. Ground fault interrupter

4. All of the above

The correct answer is: All of the above

The correct answer is based on the understanding that each of the listed devices serves a specific purpose related to safety and protection in electrical systems. A circuit breaker functions as an automatic switch that interrupts the flow of electricity when it detects an overload or short circuit. By doing so, it helps prevent overheating and potential fires, making it essential for safeguarding electrical circuits from overload conditions. Fuses, similar to circuit breakers, are designed to protect electrical circuits from excessive current. They contain a metal wire or filament that melts and breaks the circuit when the current exceeds a certain threshold, thus preventing damage to the wiring and connected devices. A ground fault interrupter (GFI) is primarily designed to protect against ground faults, which can also occur due to overload conditions in some scenarios. While its main role is different, it serves to enhance safety by cutting off the electrical supply in the event of a fault, which can be caused by an overload on a circuit. Since all of these devices provide a level of protection against electrical overloads and contribute to overall safety in electrical systems, the choice that encompasses all three devices is the correct and most comprehensive answer.