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What is a circuit breaker in Covid terms?

Circuit breakers have been used in some countries such as Singapore and Israel as way of reducing the number of cases of coronavirus by stopping the ways it can spread.

Wales says it will spend the next few days considering a circuit-breaker lockdown which they're calling a 'fire break'.

But how do they work? How long is a covid circuit breaker? How can it help fight coronavirus?

91热爆 health correspondent Laura Foster explains it all in a minute.