Watlow MC Specifications

MINIATURE THERMOCOUPLE CONNECTORS

High Quality Miniature
Connectors Ideal for a
Wide Range of Temperature
Sensing Needs

Watlow’s new and improved lines of miniature connectors
offer a wide range of solutions for your temperature sensing
needs. These new miniature connectors feature a rugged
glass-filled thermoplastic body, captive terminal plates that
allow for faster wire termination and locking connectors.
Some offer ultra-high temperature capabilities as well. Listed
below are the various miniature connectors and systems
from which to choose:

• Miniature thermocouple connectors

• Locking miniature thermocouple connectors

• Three-pin miniature connectors for RTD and grounded
thermocouple applications

• Miniature panel jacks

• Locking connector clips

• High temperature miniature connectors up to 800°F
(425°C)

Watlow’s miniature thermocouple connectors accept solid or
stranded wires up to 24 AWG, are available in Type E, J, K, N,
T, U and R/S calibrations and are ASTM E 230 color coded.
The connector is made with matching thermocouple alloy
materials to ensure accuracy in measurement and the new
captive terminal plate design allows for a strong connection.
Watlow’s miniature connectors and accessories offer both a
high quality and compact solution to your thermal sensing
needs. All of these new miniature connectors will mate with
all ANSI spec miniature connectors.

Features and Benefits

Rugged, glass-filled thermoplastic body

• Provides high impact strength

Captive terminal plates

• Allow faster wire termination

ASTM E230 color coded

• Ensures easy identification

Matching thermocouple alloy materials

• Ensure accuracy

Molded-in contacts

• Ensure precise alignment and prevent wobble in the

connection system

© 2014 Watlow Electric Manufacturing Company

RIC-MTC-0214

Miniature Thermocouple Connectors 400°F (200°C)

Watlow’s new miniature connector is for both thermocouple
and RTD circuits. This connector is suited for small wires
or small diameter mineral insulated cables. The connector
features a glass filled high quality thermoplastic body that
makes for a more rugged and durable connector. Matching
thermocouple alloys and spring loaded pin inserts ensure
an accurate and strong signal. Captive terminal screws
and molded polarity signals make for faster and easier wire
termination with less error. Watlow’s new miniature plugs and
jacks will mate with previous Watlow miniature connectors and
any other ANSI spec miniature connector.

Ordering Information

Part Number

①

②

Style Calibration

MC

③ Style

M =

Male (plug)

F =

Female (jack)

④ Calibration

E =

Type E

J =

Type J

K =

Type K

N =

Type N

R =

Type R

S =

Type S

T =

Type T

U =

Uncompensated

③

⑤④

Name

Plate

N

⑦

⑥

Color
Code

AT

Dimensional Drawings

0.63 in.

(16 mm)

1 in.

(25.4 mm)

0.31 in.
(8 mm)

⑤ Name Plate

N =

Without name

⑥ ⑦ Color Code

AT =

ASTM E230 color code/uncompensated = white

0.63 in.

(16 mm)

0.47 in.

(12 mm)

0.75 in.

(19 mm)

0.18 in.

(4.5 mm)

0.31 in.
(8 mm)

Locking Miniature Connectors 400°F (200°C)

The design of Watlow’s new locking miniature connector
prevents the unwanted loss of signal that accompanies plug
and jack separation. The bodies of the locking connectors
are constructed of a high quality glass-filled thermoplastic
that ensures a rugged design. Captive plate terminal screws
allow for faster and easier wire termination. Both the plug
and jack are marked for polarity to ensure proper assembly.
Locking connectors are compatible with existing miniature
thermocouples including Watlow’s high temperature miniature
connectors.

All of Watlow’s locking connectors accept solid or stranded
wires up to 24 AWG, are available in Type E, J, K, N, T, U and
R/S calibrations and are ASTM E230 color coded.

Ordering Information

Part Number

①

②

③

⑤④

⑦

⑥

Dimensional Drawings

Style Calibration

Name

Plate

ML

③ Style

M =

Male (plug)

F =

Female (jack)

④ Calibration

E =

Type E

J =

Type J

K =

Type K

N =

Type N

R =

Type R

S =

Type S

T =

Type T

U =

Uncompensated

⑤ Name Plate

N =

Without name

⑥ ⑦ Color Code

AT =

ASTM E230 color code/uncompensated = white

Color
Code

N

AT

0.71 in.

(18 mm)

0.75 in.

(19 mm)

1 in.

(25.4 mm)

0.47 in.

(12 mm)

0.76 in.

(19.2 mm)

0.31 in.
(8 mm)

0.31 in.
(8 mm)

0.18 in.

(4.5 mm)

High Temperature Miniature Connectors 800°F (425°C)

Watlow’s high temperature miniature connectors are
constructed of a thermoset compound with a stainless steel
bracket that results in a durable connector. The calibration
of the connector is stamped onto the bracket, ensuring easy
identification. Watlow’s high temperature mini connectors are
capable of withstanding intermittent temperatures as high
as 1000°F (540°C) and continuous temperatures of 800°F
(425°C). These connectors feature the same captive plate
technology as Watlow’s standard miniature connectors and
are capable of accepting stranded or solid wires up to 24
AWG. High temperature miniature connectors are available in
Type E, J, K, N and R/S calibrations.

Ordering Information

Part Number

①

②

Style Calibration

MH

③ Style

M =

Male (plug)

F =

Female (jack)

④ Calibration

E =

Type E

J =

Type J

K =

Type K

N =

Type N

R =

Type R

S =

Type S

③

⑤④

Name

Plate

N

⑦

⑥

Color
Code

AT

Dimensional Drawings

0.63 in.

(16 mm)

1.02 in.

(26 mm)

0.38 in.

(9.6 mm)

⑤ Name Plate

N =

Without name

⑥ ⑦ Color Code

ST =

No color code, calibration stamped on connector

0.63 in.

(16 mm)

0.47 in.

(12 mm)

0.79 in.

(20 mm)

0.18 in.

(4.5 mm)

0.38 in.

(9.6 mm)

Miniature Three Pin Connectors 400°F (200°C)

Watlow’s three pin miniature connector brings the same
high quality characteristics as our standard miniature
connectors while adding the ability to ground or shield a
thermocouple connection or connect a three wire RTD.
New captive plate technology as well as molded polarity
symbols allow for a quick and painless wire connection.
These connectors have the ability to accept wire sizes up to
24 AWG. Available in ASTM E230 color coded Type E, J, K,
N, T, U and R/S calibrations.

Ordering Information

Part Number

①

②

③

⑤④

⑦

⑥

Style Calibration

Plate

MT

③ Style

M =

Male (plug)

F =

Female (jack)

④ Calibration

E =

Type E

J =

Type J

K =

Type K

N =

Type N

R =

Type R

S =

Type S

T =

Type T

U =

Uncompensated

⑤ Name Plate

N =

Without name

⑥ ⑦ Color Code

AT =

ASTM E230 color code/uncompensated = white

Name

Color
Code

N

AT

Dimensional Drawings

0.94 in.

(23.9 mm)

1 in.

(25.4 mm)

0.47 in.

(12 mm)

0.75 in.

(19 mm)

0.31 in.
(8 mm)

0.94 in.

(23.1 mm)

0.18 in.

(4.5 mm)

0.31 in.
(8 mm)

Miniature Panel Inserts

Designed for use with Watlow’s “M” miniature connectors,
these panel inserts are suitable for thermocouple circuits.
These panel inserts mount by means of a stainless steel
bracket with two screws behind the panel. These work
especially well for instrumentation cases. Miniature panel
inserts are offered in both round and rectangular types. These
miniature inserts accept wire sizes up to 22 AWG and are
available in Type J, K and T calibration with ASTM E230 color
standards.

Ordering Information

Part Number

③

①

②

③

④

⑤

⑦

⑥

Round Miniature Panel Inserts

Dimensional Drawings

Style

MP

③ Style

C =

Circular panel insert

R =

Rectangular panel insert

④ Calibration

J =

Type J

K =

Type K

T =

Type T

⑤ Name Plate

N =

Without name

⑥ ⑦ Color Code

AT =

ASTM E230 color code

Calibration

Name

Plate

N

Rectangular Miniature Panel Inserts

Color
Code

AT

1.0 in.

(25.4 mm)

1.10 in.

(28 mm)

0.75 in.

(19 mm)

Note: Rectangular miniature panel inserts are shipped standard
with a clip spring, and a bracket and screw mounting system.

Dimensional Drawings

0.93 in.

(23.5 mm)

1.10 in.

(28 mm)

0.55 in.

(14 mm)

Crimp/Braze Adapter

These adapters are designed for
brazing, soldering or crimping on
mineral insulated cable or crimping
onto insulated wire.

Ordering Information

Part Number

③

①

②

⑤④

⑥

Sheath

Size

MHX

④ ⑤ ⑥ Sheath Size

032 =

0.032

040 =

0.040

063 =

0.063

125 =

0.125

Grommets

Grommets can be fitted in the entrance
hole of the connector to prevent
moisture and dirt from entering the
connector. All grommets are constructed
from silicone with a maximum
temperature of 400°F (200°C) and are
pre-slit to allow for easy installation.
These grommets will compress on the
wire once the cover is fitted.

Miniature Connector Locking Clips

Watlow’s miniature connector
locking clip is a cost efficient and
effective means to prevent accidental
disconnection. This locking clip
is constructed from high quality
thermoplastic that can withstand
400°F (200°C). Locking clips are
compatible with all MC-series
miniature connectors.

Ordering Information

Part Number Description

80441501 Locking connector clip

Wire Clamp

Wire clamp brackets will
provide optimum strain relief.
Construction allows a large
difference in maximum and
minimum wire diameter.

Ordering Information

Part Number Description

80441301 Stainless steel wire clamp

Ordering Information

Part Number Description

71305601 Grommet with 0.12 in. (3.0 mm) diameter
71305602 Grommet with 0.02 in. (0.5 mm) diameter
71305603 Grommet with 0.06 in. (1.5 mm) diameter

®

Watlow
Company.

is a registered trademark of Watlow Electric Manufacturing

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