Connector MS 3101 is a cable-connecting
K - Fireproof
receptacle. It is used with cables or in other installations
R - Environment-resistant (lightweight)
where mounting provisions are not required.
Solid-shell connectors are used where no special
Connector MS 3102 is a box-mounting receptacle.
requirements are necessary. The rear shells are made
It is intended for use where a detachable connection is
from a single piece of aluminum.
required on a shielded box or unit of equipment.
Split-shell connectors allow maximum access to
MS 3106 is a straight plug that is used when circuits
soldered connections. The rear shell is made in two
are to be connected where space limitations are not
halves, either of which maybe removed. An exploded
critical. It consists of a front shell (often called an insert
view of one type of split-shell connector is illustrated in
barrel), a coupling ring, the insert, an insert retaining
figure 5-8.
device, and a rear shell.
Pressurized connectors provide a pressuretight
MS 3107, a quick-disconnect plug, is used where
feedthrough for wires that pass through walls or
very rapid disconnections must be made. A special
bulkheads of pressurized compartments. The contacts
coupling device is used instead of a coupling ring. This
are usually molded into the insulator, and the shell is
type of plug is similar to the MS 3106.
spun over the assembly to seal the bond.
Connector MS 3108 is a 90-degree-angle plug
Fireproof connectors are made under specifications
t h a t is similar in construction to - the M-S 3106
that require that the connectors maintain effective
connector. The difference is that the rear shell of the
electrical service for a limited time even when exposed
MS 3108 provides a right-angle bend, required where
to fire. The inserts are made of a ceramic material, and
space is limited.
special crimp-type contacts are used.
Environment-resistant connectors are used in areas
Classes
where changes in temperature may cause condensation
or where vibrations are likely to occur.
There are six classes of MS connectors, each
designed for a particular kind of application. Letter
Identification Symbols
d e s i g n a t i o n s are assigned for the types of shell
indicators used. As an example, in the MS 3106E, the
letter E indicates an environment-resistant shell. Letter
Each connector is given an identification symbol
designators and the kinds of shells used areas follows:
called the MS part number. This symbol indicates the
shell type, the shell design, the size, the insert type, the
A- Solid
insert style, and the insert position. An example is the
designator MS 3106A18-4SX, shown in figure 5-9. A
B - Split
description of the designator is as follows:
C - Pressurized
1. The standard letters indicate that the connector
E - Environment-resistant
was manufactured to government standards.
Figure 5-8.--Exploded view of a split-shell connector.
5-9
