This part of IEC 61076-2 specifies circular connectors with a push-pull locking mechanism of a size derived from and thus being compatible with M12 screw-locking connectors (free connectors with screw-locking according to IEC 61076-2-101, IEC 61076-2-109, IEC 61076-2-111 or IEC 61076-2-113 are compatible to push-pull fixed interfaces according to this standard) and with mating interfaces according to IEC 61076-2-101, IEC 61076-2-109, IEC 61076-2-111 or 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 rewireable or non-rewireable, with M12 push-pull locking as explained above. Male connectors have round contacts from Ø0,6mm up to Ø1,5mm. In addition, the push-pull mechanisms consist of 2 different push-pull designs: a) an outer push-pull for male and female fixed connector, where the locking groove is placed onto the outer cylindric surface of the housing. The outer push-pull for female fixed connectors is made for 2 different types of male connectors. It has locking means for both types on its outer surface. Note: design and dimensions see 5.3.1 and 5.3.2 b) An inner push-pull for female fixed connectors, where the locking means are placed onto the inner cylindric surface of the housing. Note: design and dimensions see 5.3.3