EN 4644-001-2017 pdf download.Aerospace series – Connector, electrical and optical, rectangular, modular, rectangular inserts, operating temperature 175 °C (or 125 °C) continuous – Part 001: Technical specification.
— size 2 male housing has a central coupling mechanism which can take 12 positions to polarize the housing.
Size 2 male housing is panel mount connector or cable connector.
Size I and 2 male housings are available with (class B and F) or without grounding block (class A, C and E) allowing grounding of a cable braid with a pigtail.
For rack and panel application, the following housings are described:
— size 2 male housing has three polarization posts, each of them can take 4 positions to prevent mismating between male and female housing.
— size 3 male housing has three polarization posts, each of them can take 4 positions to prevent mismating between male and female housing.
— size 4 male housing has three polarization post, each of them can take 4 positions to prevent mismating between male and female housing.
Male housing shall be installed on equipment side and can be connected to PCB or cable harness. No grounding block option is available for rack and panel housings.
The insert cavities are identified on the male housing by letters A, B, C, D for size 4, letters A, B, C for size 3. letters, A. B for size 2 and no letter for size 1.
The insert cavities are polarized by either one or two keyways location. Housing size 1, 3 and 4 insert cavities have one keyway. Housing size 2 insert cavity identified with letter A has one keyway and insert cavity identified with letter B has two keyways.
Each insert cavity has 2 insert retaining devices allowing rear insertion and rear release of the insert.
All male housing have a minimum of 1 (for single cavity connectors) and a maximum of 2 aligning housing cavities (see Figure 5 and Figure 7); the remaining housing cavities are non-aligning cavities (see Figure 6 and Figure 8).
This principle is not valid for size 4 male housing because it can be mated with 2 size 2 female housings.
Aligning cavities guaranty not only the alignment between male and female housing but also guarantee the shell to shell bottoming.
Non-aligning housing cavities have a circular location.
In order to define how alignment of the female and male housing is achieved, a clinging dimension line between the 2 housing aligning cavities is defined.
A blank insert is installed in a housing cavity where no contact is required. This blank insert has no polarizing rib and the same dimensions as an insert for pin contacts. It can be installed in any male or female housing cavity. This blank insert can mate without causing any interference with an insert for male contacts or with an insert for female contacts. The blank insert does not provide sealing.
4.6 Keying mechanism
Keying mechanism for disconnect connectors:
— Size 1 housings have a polarizing system using polarizing posts having a L shape cross section and polarizing keys having a L shape cavity to mate with the polarizing posts. Each polarizing post and key provides 4 polarizing positions. Each Post and key is retained in the housing by a special shape which allows them to be clipped in the housing.
Size 1 housings have 2 polarizing pins offering 16 polarizing positions.
— The size 2 housing has either a centre coupling screw or coupling nut which ensures also the polarizing function. The coupling screw has a coding peg and the coupling nut has a coding slot. The centre coupling screw and nut have an hexagonal shoulder which slides in an hexagonal print in the housing, consequently, the coupling screw or nut can take 6 positions. The coding peg on the coupling screw and the slot on the coupling nut can be vertically aligned with an angle or a flat of the hexagonal shoulder. There are 2 types of coupling screw and coupling nut, those having the coding peg or the slot aligned with a flat and those for which it is aligned with an angle of the hexagonal shoulder. These 2 types of coupling screw and nut provide a total of 12 polarizing positions.
Keying mechanism for rack and panel connectors:
Size 2, 3 and 4 housings have a polarizing system using polarizing posts having a L shape cross section and polarizing keys having a L shape cavity to mate with the polarizing posts. Each polarizing post and key provides 4 polarizing positions. Each post and key is retained in the housing by a special shape which allows them to be clipped in the housing.EN 4644-001-2017 pdf download.