What should happen when pressing the button on a tester during a GFCI test?

When pressing the button on a tester during a Ground Fault Circuit Interrupter (GFCI) test, the expected outcome is that the circuit breaker must trip. This action is a key function of a GFCI, which is designed to protect against ground faults by interrupting the current flow when it detects an imbalance between the outgoing and returning current.

Pressing the test button simulates a ground fault condition. A properly functioning GFCI will trip and cut off power to the circuit, which is essential for preventing electrical shock hazards. This tripping action confirms that the GFCI device is operating correctly and is able to perform its safety role effectively.

In context, while the other options may suggest functionality related to circuits or testers, they do not align with the expected response of a GFCI during a test. For instance, if the circuit remained active, that would indicate a failure in the GFCI's operation. Similarly, an indicator light turning green might suggest that the device is functioning under normal circumstances, but does not specifically address the testing scenario's purpose, which is to ensure tripping occurs. Lastly, a voltage reading of zero is not an appropriate measure when testing; it is more about the action of the breaker