Guide to Selecting a Connector
In selecting a connector, it first must be
determined if a non-environmental 97 A
or B Series 5015 type is required or if an
environmental MS-5015 Class E, F, or
R type* is required.
If determined that the general duty,
non-environmental 97 series is the
choice - then this catalog is appropriate
to your needs
The following 8 steps apply to for-
mulation of a part number.**
How many wires are you
going to connect?
These two questions are important, be-
cause they indicate which insert you
need. There are literally hundreds to
The insert arrangements for solder
contact connectors are illustrated on
pages 6-11. The inserts most often used
are highlighted on these pages.
Here’s an example of how to choose
an insert arrangement. Say you want to
connect eight 16-ga. wires, - first find
the section of arrangements contain ing
8 contacts. Insert number 20-7 is the
one you want because it contains eight
16-ga. contacts and it is one of the most
often used. The one you choose might
depend on your space or voltage re-
quirements. The voltage capacity of
each insert is listed under its diagram.
If you have more than one wire size
to connect, the method is essentially the
same. Actually, the insert configura tions
for multiple-size wires are a lot more
flexible than they appear. That’s be-
cause you can always solder a smaller
wire to a larger contact. How ever, sol-
dering a large wire to a small contact
isn’t recommended because of size and
What if several identical
connectors have different
Here’s a situation to watch out for. You
have four identical receptacles on a
panel. One carries high current loads.
The others have low current functions.
A plug mated with the wrong receptacle
(cross-mating) could ruin your valu able
To avoid cross-mating, you can order
identical inserts positioned in both the
plugs and receptacles at vari ous angles
from standard. These varia tions from
standard position are called alternate
insert positions, and are described on
What kind of receptacle do
For Wall Mounting Use a wall recep-
tacle, type 3100. The elongated back of
this receptacle extends through thick
wall material. It is threaded to accept
standard hardware fittings.
For Unmounted Applications Use
the cable receptacle, type 3101.
For Box or Panel Mounting Use the
box receptacle, type 3102. This recep-
tacle’s back is short to conserve space.
It is not threaded on the back end and is
used when no accessories such as
clamps are needed.
What kind of plug do
For ordinary situations The straight
plug, type 3106 meets most connector
requirements. However . . .
when space is critical you may want
to consider using an angle plug, type
3108. This type plug lets the cable enter
your equipment at a right angle.
Which connector gets the
socket? - the receptacle or
You’re at the point where you desig nate
which inserts are used with which
shells. Either pin or socket inserts can
be used with plugs or receptacles.
Here’s a good rule of thumb. Order
the sockets for the connector at the
“hot” side of the circuit. By having sock-
ets at the power source, there’s little
chance that a wayward finger or screw-
driver will short the circuit or cause per-
The designation for sockets is sim ply
S in a part number, following the insert
code number. For pins, the des ignation
is P. Therefore, the 20-7P insert would
have pin contacts, while the 20-7S in-
sert would have socket contacts.
What type of plating is
If you prefer the standard olive cad-
mium, non-reflective, electrically con-
ductive finish, then no suffix number is
required. Other plating variations are
available, including environmentally
friendly zinc alloy. See how to order in-
structions for the various plating fin-
ishes offered for 97 Series solder con-
nectors on page 18.
Do you need any
Accessories - cable clamps, protection
caps and chains, conduit adapters,
and panel gaskets are shown on pages
* If an environmental type SAE AS50151, F or RClass is required, then
the catalog that should be consulted is IC-5 AC and SAE AS50151
Threaded Cylindrical Connectors. See www.amphenol-industrial.com
for on-line catalogs or contact Amphenol, Sidney, NY.
** These steps are for solder type connectors which are described in detail
on pages 3-18. If a crimp type connector is needed, the same steps ap-
ply, however, you should consult pages 19-27 for details on 97 Series
connectors with crimp contacts.