Pad-mounted transformers have fuses that are located internally, but are operated ___________

• A. Externally
• B. Internally
• C. Manually
• D. Automatically

Answer: (A)

When pad-mounted transformers protect against faults, the fuses are placed inside the sealed, weatherproof enclosure to shield the transformer from internal faults. The act of turning the transformer on or off, or isolating it for maintenance, is done from outside the cabinet using an external disconnect or switch. This setup keeps the protective fuses protected inside while allowing safe and straightforward external control by qualified personnel. So, the correct behavior is that the fuses are internal for protection, but the operation is performed externally.