The modular system is formed around basic units, Which are equipped with additional functions by means of modules.
In addition to basic unit contacts, top-mounted auxiliary contact modules offer two or four contact extensions.
To prevent duplicating terminal markings when NO and NC contacts are combined, the modules will have different position digits.
Picture iustrates the difference between early make (EM) and late break (LB) contacts and make (NO) and break (NC) contacts that are met at top-mounted auxiliary contact modules.
The contacts layout for the module illustrated is, from left to right: 53-54 NO, 61-62 NC, 75-76 NC/
LB and 87-88 NO/EM.