*Question G0B12:
What is the purpose of a power supply interlock?*  

*Correct Answer is  C: To ensure that dangerous voltages are removed if the cabinet is opened*  

### AI Response: (may contain errors)  

A power supply interlock is a safety feature designed to protect users from electrical hazards. Here's why the correct answer is correct and why the other choices are incorrect:

1. **Correct Answer: C - To ensure that dangerous voltages are removed if the cabinet is opened**
   - The primary purpose of a power supply interlock is to automatically disconnect power when the cabinet or enclosure is opened. This prevents exposure to high voltages that could cause electric shock or injury. It is a critical safety mechanism in high-voltage equipment.

2. **Why the other choices are incorrect:**
   - **A: To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty**
     - While preventing unauthorized changes might be a concern for manufacturers, it is not the purpose of a power supply interlock. The interlock is specifically for safety, not warranty enforcement.
   - **B: To shut down the unit if it becomes too hot**
     - Overheating protection is typically handled by thermal sensors or thermal cutoffs, not by a power supply interlock. The interlock is not designed to monitor temperature.
   - **D: To shut off the power supply if too much voltage is produced**
     - Voltage regulation and protection against over-voltage are managed by other components, such as voltage regulators or over-voltage protection circuits. The interlock is not involved in voltage regulation.

In summary, the power supply interlock is a safety feature to ensure that dangerous voltages are not present when the equipment is accessed, protecting users from potential electrical hazards.