Circular M12 and ½-20″ cordsets and receptacles are available in a variety of pin configurations and wire color codes. In addition to a variety of pin out and color code differences, each of these connectors also has distinct keyways. Below is a chart displaying these keyways.

1. M12&1/2-20”
CONNECTORS
KEYWAY CHART
CIRCULAR M12 AND ½-20ʺ CORDSETS AND RECEPTACLES ARE AVAILABLE IN A
VARIETY OF PIN CONFIGURATIONS AND WIRE COLOR CODES. IN ADDITION TO A
VARIETY OF PIN OUT AND COLOR CODE DIFFERENCES, EACH OF THESE CONNECTORS
ALSO HAS DISTINCT KEYWAYS. BELOW IS A CHART DISPLAYING THESE KEYWAYS.
The EURO-AC(MEC) series has a reversed single
keyway which is known as B-code. This allows two
unique M12 connectors to be mounted on the same
panel without fear of incorrectly coupling connectors
to equipment with varrying voltage and amperages.
EURO-AC
B-CODE
The Micro-DC (MDC) series, also known as
micro-change or M12, is one of the most widely used
industrial quick disconnects in the industrial market.
Despite the name, these euro-style connectors can
be used in both AC or DC applica�ons. The uses of
these applica�ons in industrial automa�on are
limitless, but they are commonly used in factory
automa�on for items such as sensors, actuators,
motors, switches, safety light curtains and mats, and
interlock switches to name a few.
MICRO-DC
A-CODE
The MICRO-AC(MAC) series uses a ½-20 ma�ng
thread and has a first make last break extended
ground pin. The use of a double keyway (C-Code)
prevents it from accidentally plugging into one of the
other similarly sized connectors.
MICRO-AC
C-CODE
M12 Ethernet series(MDE45) u�lizes 4 wire (D-Code)
connectors with 2 pair Cat 5e cables or M12 8 wire
(A-Code) connectors with 4 pair Cat 5e cable. The
MDE45 is specifically used in Industrial Ethernet
applica�ons, and has teal cable using twisted pairs of
wires inside.
ETHERNET
D-CODE
Manufacturer of Electrical Connectors
MENCOM CORPORATION
www.mencom.com
2 Pole
4 Pole
3 Pole 4 Pole 5 Pole
6 Pole 8 Pole 10 Pole 12 Pole
MICRO-DC (MDC) COLOR CODE
with Male Faceview
EURO-AC (MEC) COLOR CODE
with Male Faceview
MICRO-AC (MAC) COLOR CODE
with Male Faceview
ETHERNET (MDE45) COLOR CODE
with Male Faceview
3.Brown
4.Blue
1.Brown
4.Blue
3.Black
1.Brown
2.White
3.Blue
4.Black
1.Brown
4.Black
3.Blue
5.Gray
2.White
4.Black
1.Brown
2.White
3.Blue
6.Pink
5.Gray
2.Brown3.Green
4.Yellow
5.Gray 6.Pink
8.Red
1.White
7.Blue
2.Brown3.Green
4.Yellow
5.Gray
6.Pink 8.Red
9.Orange
10.Tan
1.White
7.Blue
2.Brown3.Green
4.Yellow
6.Pink
5.Gray
8.Red
9.Orange
10.Tan
1.White
7.Blue
11.Black
12.Violet
5 Pole3 Pole
4.Green/Yellow
1.Brown
2.Blue
4.Green/Yellow
1.Brown
3.Blue
2.White
5.Green/Yellow
1.Brown
3.Blue
2.White
4.Black
2 Pole
1.Brown
2.Blue
3 Pole
5 Pole
4 Pole
2.Red/White
3.Red
2.Red
2.Red/Black3.Red/White
1.Red/White
1.Green/Yellow 4.Green/Yellow
4.Red/Yellow
5 Pole
5.Red/Black
3.Green/Yellow
6 Pole
5.Red/Black
2.Red
1.Red/White
6.Red/Blue 4.Red/Yellow
3.Green/Yellow
4 Pole
1.White/Orange
2.White/Green
3.Orange
4.Green
8 Pole
2.White/Brown3.Brown
4.Orange
5.White/Green 6.White/Orange
8.Green
1.White/Blue
7.Blue
1.Red/Black