What occurs when the reset button on an overload relay is pressed?

When the reset button on an overload relay is pressed, the primary function is to reset the bi-metallic strip that is responsible for sensing overload conditions. In an overload scenario, the bi-metallic strip bends due to heat generated by excessive current, causing the relay contacts to open and interrupt the circuit. By pressing the reset button, you return the bi-metallic strip to its original position, allowing current to flow again when conditions permit. This process is crucial for the safe operation of electrical systems, as it enables the relay to function properly after an overload event and helps prevent potential damage to equipment.

The other choices do not accurately describe the function of the reset button. Breaking the circuit entirely would defeat the purpose of the relay, which is to protect without completely disconnecting power. Increasing the load current does not happen when the reset button is pressed; rather, it allows the existing circuit to be restored. Permanently disabling the relay is counter to its design function; overload relays are meant to reset and enable the system to recover from fault conditions, not to remain inoperative.