Siemens 56 program digital time switch 230v ac multi languages siemens 7lf4522 0 the siemens 7lf4521 0 is a din rail dual channel digital time switch with a diverse range of functions that make it simple to use the timer is text led and the programming can be performed in six languages german english french italian spanish and dutch it is supplied with the time date and summerwinter conversion for central europe installed before delivery so that you can begin programming immediatel