Correct option is C
Horn gaps acts as a protection from high voltage surges.
Horn gaps are a type of protective device used in electrical systems to safeguard equipment from
high voltage surges. They consist of two horn-shaped electrodes arranged with a gap between them. When a high voltage surge occurs, the gap allows an arc to form, safely discharging the excess energy and protecting the equipment.
Breather – Used in transformers to prevent moisture from entering through the conservator. It does not provide protection from high voltage surges.
Thermal overload relay – Protects electrical equipment from overheating due to overcurrent, not high voltage surges.
Conservator – A component of a transformer that maintains oil levels; it does not protect from voltage surges.
