没有复位至零，这意味着合成回路锁定时间将是可变的。
There is no reset to zero , which means that the synthesiser loop lock-up time will be variable.
适用于电视聚焦，振荡，定时回路。
Used in TV gathering focus, oscillation frequency and timer circuits.
它能关合、承载、开断运行回路正常电流，也能在规定时间内关合、承载及开断规定的过载电流。
It can turn on, bear and break normal current in circuit, but also bear and break the overloaded current within stipulated time.
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