What is mean by auto re-closer in high voltage breaker?

Many high-voltage overhead line faults are temporary in nature -e.g. a branch hitting a line conductor during a storm. An 'autorecloser' mechanism is designed to automatically reclose a circuit breaker after it has tripped. If the fault has cleared itself, then the circuit breaker will remain closed; if not, the autorecloser mechanism can be set to reclose the circuit breaker several times (typically 3) before, finally, locking the circuit breaker open. Autoreclosers are often used in conjuction with 'sectionalisers'; these are non-load breaking switches which will disconnect sections of line towards the end of a feeder, in the hope that any fault has existed beyond that point and will be cleared before the autorecloser recloses the circuit breaker.