Name an electrically operated shut-off valve:

A solenoid valve is an electrically operated shut-off valve that uses an electromagnetic coil to open or close the valve. When electricity flows through the coil, it creates a magnetic field that either pulls or pushes a plunger, allowing or restricting fluid flow. This mechanism allows for precise control of flow in refrigeration and HVAC systems, enabling automatic response to changes in system conditions or control signals.

The automatic expansion valve, while it regulates flow, does not operate solely on electrical signals. Check valves are mechanical devices that allow flow in one direction and do not have any electrical components. Isolation valves are typically manually operated and are not dependent on electric operation to function. This makes the solenoid valve the correct choice when identifying an electrically operated shut-off valve in these options.