What is the difference between the older D2 style contactors where aux contacts had to be specified and the newer LC1D contactors?
Crossing into new units from old units require a review of differences
The older D2 style contactors required a specification of needed auxiliary contacts. For example:
LC1D2501G6 would be an LC1D25 with 1 NC contact
LC1D2510G6 would be an LC1D25 with 1 NO contact
The newer contactors automatically come with 1 NO and 1 NC auxiliary contact. For example:
LC1D25G7 has 1 NO and 1 NC contact
The older contactors usually had a dedicated 60hz coil. This is designated by the 6 at the end of the part number. The newer contactors have coils designed for 50/60hz and are signified by the 7 at the end of the part number.