This part of IEC 61076-2 specifies circular connectors with an inner push-pull locking mechanism of a size derived from and thus being compatible with M12 screw-locking connectors (male free connector with screw-locking according to IEC 61076-2-101, IEC 61076-2-109, IEC 61076-2-111 or IEC 61076-2-113 is compatible with female inner push-pull fixed connector according to this standard) and with mating interfaces according to IEC 61076-2-101, IEC 61076-2-109, IEC 61076-2-111 and IEC 61076-2-113. NOTE M12 is the dimension of the thread of the screw-locking mechanism of circular connectors with M12 screw-locking. This standard covers both 1. power connectors with current ratings up to 16 A and voltage ratings up to 630 V, typically used for power supply and power applications in industrial premises, and 2. connectors for data and signal transmission with frequencies up to 500 MHz. These connectors consist of both fixed and free connectors, either rewirable or non-rewirable, with M12 inner push-pull locking as explained above. Male connectors have round contacts from Ø0,6 mm up to Ø1,5 mm. This standard covers various types of connectors identified by their codings with different contact arrangement, not mutually interchangeable. The design of the inner push-pull mechanism prevents the unintended mating of the male inner push-pull free connector with the female connector with M12 screw-locking even for identical coding.