PLESSEY
INTERCONNECT

Mark 4 Connectors

Aluminium and  brass

Plessey  Mark 4  plugs and  sockets in  brass or  aluminium can  be issued  "on   release" from  SASCO  under  Ministry of Aviation Supply  procedures as manufacturers' proprie­ tary  items.

Characteristics

Pressure  sealed  against   20  lb   per   square  in  gauge pressure, with a leakage rate  not exceeding I  cc per hour.

Connectors-Mk 4

The  complete range  of Mk. 4 Plugs and  Sockets  is cata­ logued  in this section  and all units  with the  same contact arrangement are shown  grouped together. The  units are listed   in  order  of  number  of  contacts  and   layout   is arranged so  that   mating  components can  be seen  at  a glance.  There are   no  other  mating  combinations apart from those  shown. Thus:

 	c 	I

Range of operating temperatures -40 octo  +85 QC

 	 	I  I; I

 	D 	I
E	I

A rna-with C. D or E

Normal   ranges.  -40 oc to +85 oc Single  piece gasket

A 	II
 	X	I

A & B tosether

ranges.

I    	B

y 	

I

'"I 	
l::sc

mate  with  X or Y

 	F	I

Voltage ratings from 250 V a.c. to 2·5 kV peak.

    I 	G 	I

B mates with  F, G or  H

(Ministry  of  Defence   High  Tension   Ratings  are   5QV

lower.)

Current ratings of 5, 12, 19, 35 and 60 A.

(Ministry  of  Defence   Ratings  2·5,   12,  16, 35  and  60  A

respectively.)

Insulation resistance between any contact  and earth is in excess of I 0 M Qat 500 V d.c. under  worst conditions.

Dielectric Phenolic.

Plug  and socket  contacts  silver-plated brass  giving  a maximum  contact resistance of 2 m Q.

Vibration  proof  Proof  tested to  meet   the   vibration

 	R	I
The  diagram  at "t'he  side  of each- group shows  the   Plug

contact arrangement, the  contact coding and  moulding characteristics of  the   mating  face  of  a  Fixed  Plug.  All coding  of sockets is reversed, i.e. a mirror image of the plug coding.
A unique  feature of  Plessey  Mk. 4  Plugs and  Sockets  is

that  the  internal  moulding  carrying  the  contacts may be located  in any one  of six  radial  positions  relatie to the keyways  in  the  outer shell.  This  facility  eliminates the possibility  of mismating  adjacent plugs and sockets of the same  contact arrangement. The  sixth   position  is known as "neutral" (as shown  in all diagrams)  and  orientations
I     to 5 are  marked  accordingly  on  the   moulding.  Unless