This prevents wiring errors like short-circuiting a power supply or accidentally floating a neutral. Here is where the confusion begins. Most major manufacturers (Siemens, ABB, Schneider Electric) no longer explicitly cite DIN 43670 on their datasheets. Instead, they reference EN 50012 or IEC 60947-5-1 .
If you have ever searched for a "DIN 43670 PDF," you have likely hit a wall of confusing results, dead links, or contradictory information. This post is a deep dive into what this standard actually governs, why it is critical for switchgear design, and why the elusive PDF is harder to find than you think. At its core, DIN 43670 defines the arrangement and designation of terminals for control circuits in switchgear assemblies . 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 . This prevents wiring errors like short-circuiting a power
