The First Specifically Designed Circuit Breaker for Aquariums/Fish Tanks with submerged electrical equipment and also for Pond Equipment.Like most circuit breakers the Arcadia Classica Aquarium Self Re-setting Circuit Breaker will disconnect the power in the event of an abnormality such as a current surge.Unlike most other circuit breakers the Arcadia Classica Aquarium Self Re-setting Circuit Breaker will automatically reset itself once the power supply has returned to normal. This has advantages to the keeper of an aquarium / Pond particularly if the circuit breaker was to activate when you are on holiday or away for any length of time.It will ensure that your heating and filtration equipment are re-instated when the electricity supply is reconnected giving you peace of mind.