preset timer
... preset apparatus 预先调节器 preset keys 预制按钮 preset timer 限时器 ...
interval timer
... inter-sync 内同步 interval timer 限时器 interval 间隔,时间间隔,中断期 ...
definite time relay ; independent time lag relay ; specifiedtimerelay ; constant time relay
电 overload time relay
inverse time relay ; inverse time lag relay ; dependent time lag relay