Din 43670 Pdf -

In plain English: It tells manufacturers and electricians exactly how to label and physically arrange the screw terminals on control devices (like relays, contactors, and timers) so that a maintenance worker in Munich can troubleshoot a panel built in Milan.

It is the "grammar rule" for terminal numbering. While IEC 60755 and general low-voltage directives cover broader safety, DIN 43670 focuses on a specific, brilliant logic: The distinction between incoming supply and outgoing control. din 43670 pdf

The standard is effectively "dead" as a standalone document, but its DNA is alive in every contactor you wire. The odd/even rule is so fundamentally logical that it transcended the need for a standard. It became common law . In plain English: It tells manufacturers and electricians