Quartz timer day 1 changeover 230V/50-60Hz 3TE auto. SO/WI switching Mechanical timer SENTRON 7LF5 for the time-controlled switching of electrical consumers, e.g. lighting or industrial control systems.The mechanical timers from Siemens are particularly robust.The 7LF5 timers are available as synchronous or quartz timers for DIN rail or wall mounting with different time ranges and with different auxiliary contacts.Timers 7LF - safety, comfort and energy saving.