Amphenol Heavy Duty
Cylindrical Connectors
12-052-9
®
Amphenol
Amphenol Heavy Duty
Cylindrical Connectors
MIL-C-22992/Proprietary
• High Current Capacity
• Rugged Construction
• Safety
• Serviceability
Amphenol meets the demands for heavy duty connectors by
providing three cylindrical connector series, each with unique
design characteristics for reliable operation in specific indus-
trial environments.
Class “L” –
for the heaviest electrical loads (Pages 2 – 19)
• Current range from 40 to 200 amperes
• Direct current or single/three phase, 60/400 Hertz alternat-
ing current
• Automatic grounding for safety
• MIL-C-22992 qualification
QWLD –
for most power and control circuits (Pages 21 – 77)
• Military (MIL-C-22992) qualified connectors and industrial
equivalents available
• Increased shell size for greater durability than similar stan-
dard connectors
QWL –
a more compact heavy duty design for industrial power and control applications
(Page 78, references Amphenol Catalog 12-053)
These three series share the following common characteristics which are critical to reliable heavy
duty connectors:
• Resistance to the operating environment. Refer to environmental data, below.
• Double stub coupling threads for faster connections; no cross threading, easy cleaning.
• Left hand accessory threads to minimize cable twisting, wire breakage, accidental connector
disassembly.
• Gaskets or O-rings at appropriate surfaces for perfect weathertight connections.
Amphenol
®
heavy duty connectors have been exposed to the following environmental conditions,
without compromise of mechanical integrity or degradation of electrical performance.
Condition
Configuration
Description
Reference
®
Thermal Shock
Moisture Resistance
(Cable mounted connectors)
Durability
Salt Spray
(Corrosion)
Vibration
Unmated
Mated
Mated
Unmated
Five complete one hour temperature cycles of
–55°C to +125°C
Ten complete 24 hour cycles of +25°C to
+65°C temperature at 90% to 98% humidity
500 complete mating/unmating cycles
48 hour exposure to atomized 5%
saline solution at +35°C
10 to 55 Hz, .06 inch total excursion
in 1 minute cycles for 6 hours, 55 to
2000 Hz, 10G peak amplitude sweep
Nine hammer blows from 1, 3 and 5 feet,
three each in three axes on mounting panel
Maximum rated DC current for four
hours at +25°C in still air
20 hours immersion in hydraulic
fluid and lubricating oil
4 hours immersion at 1 atmosphere
pressure differential
MIL-STD-1344, method
1003, test condition A
MIL-STD-202, method 106
MIL-C-22992
MIL-STD-1344,
method 1001
MIL-STD-1344,
method 2005
MIL-STD-202,
method 207
MIL-C-22992
MIL-C-22992
MIL-C-22992
Mated
High Impact
Heat Rise (Class L only)
Fluid Immersion
Water Immersion
Mated
Mated
Unmated
Mated and
Unmated
1
Amphenol Heavy Duty
Cylindrical Connectors
MIL-C-22992, Class L
The Amphenol
®
Class L* heavy
duty connectors are the largest
size cylindricals, highly suitable for
industrial or military applications,
and designed to meet the demands
of heavy power interconnections.
The design features of this connec-
tor series provide:
®
wall mount receptacle
(power source)
• Greatest Capacity -
current ranges 40 to 200 amps,
conductor sizes 6 to 4/0
• Safety -
complete protection of personnel
and equipment if connectors are
inadvertently disconnected under
load
• Foolproof Mating -
design incorporates specific volt-
age, current, frequency, phase and
grounding requirements
• Standardization -
MIL-C-22992 Class L insert
arrangements specify connector/
cable combinations for maximum
reliability
• Serviceable Contacts -
contacts are normally crimped to
the cable before connector assem-
bly. No insertion tools required.
Bushings are available to adapt
smaller diameter wires to larger
contacts
straight plug
cable connecting receptacle without
coupling ring
wall mount plug with
coupling ring
(equipment end)
2
* Amphenol design is covered by one or more of the
following U. S. Patent Numbers:
3,023,396; 3,221,292.
Amphenol Heavy Duty
Cylindrical Connectors
MIL-C-22992, Class L
Class L connectors are available only in the specific con-
figurations prescribed by MIL-C-22992 for either military
or industrial applications. This rigid configuration control
assures correct interconnection of electrical circuits for
maximum safety and reliability. Controlled parameters
include:
Connector shell style and contact type -
wall mount
and cable connecting receptacles are supplied with
socket contacts only and always lead from the power
source. Plugs (with coupling rings) have pin contacts only
and always lead to the equipment end.
Shell size -
the direct relationship of shell size to current
carrying capability reduces the possibility of inadequate
wiring for heavy electrical loads.†
Shell Size
Current Rating
(Amperes)
Contact Size
®
Other outstanding design features:
Arc quenching design -
recessed socket contacts within
the insert create an arc suppressing chamber which pro-
tects the user when connectors are separated under
load.
Programmed coupling sequence -
grounding and neu-
tral contacts engage before power contacts.
Waterproof design -
a unique combination of grommets
and seals provides waterproofing in any condition -
mated or unmated, capped or uncapped.
Rugged construction -
machined from high strength
aluminum. Straight-line attachment of accessories elimi-
nates possibility of cable twisting or misalignment.
Accessories -
supplied with all Class L connectors as
indicated on the individual connector descriptions.
Replacement accessories may be ordered separately.
See pages 12 through 15.
28
32
44
52
40
60
100
200
6
4
1/0
4/0
Keyway position -
four positions of the main keyway are
used to discriminate between the following power
sources:
two wire D.C
two wire single phase A.C.
three wire single phase A.C.
four wire three phase A.C.
Insert rotation -
when carrying alternating current (A.C),
different angular rotations of the insert within the connec-
tor shell are used to distinguish between 60 Hertz and
400 Hertz circuits.
† MIL-C-22992 includes shell size 48, rated at 150 amperes. Consult your local
Amphenol sales representative or Amphenol, Sidney, NY for availability.
3
MIL-C-22992, Class L
how to order
Connectors are supplied with removable contacts unassembled and applica-
ble accessories as listed in the individual connector style descriptions,
pages 8 through 11. Additional/replacement contacts or accessories may be
ordered by their MS designations.
Connectors are ordered by MS designation. To illustrate the ordering proce-
dure, part number MS90555 C32412SY is shown as follows:
PART NUMBER
MS90555
1
C
2
32
3
4 12
4
5
S
6
Y
7
1. MS Number -
MS90555 designates wall mount receptacle
(power source)
MS90556 designates straight plug
MS90557 designates cable connecting receptacle without coupling ring
MS90558 designates wall mount plug with coupling ring
(equipment end)
2. Shell Finish -
C (conductive) for AC or N (nonconductive) for DC circuits.
Grounding Assemblies: Finish C
Shell Master Key/Keyway Position
60Hz & 400Hz
1 Phase
Shell
Size
Current
Rating
Amps
2 Wire
120 VAC
240 VAC
3 Wire
120/240
VAC
3 Wire
450/480
VAC
120/208
VAC
3 Phase
4 Wire
240/416
VAC
277/480
VAC
Shell
Size
Current
Rating
Amps
Shell Master/Key
Keyway Position
DC
2 Wire
28 VDC
Non-grounding Assemblies: Finish N
28
32
44
52
40
60
100
200
4 (120°)
4 (120°)
4 (120°)
---
5 (135°)
5 (135°)
---
---
4 (120°)
4 (120°)
4 (120°)
4 (120°)
---
---
1 (60°)
---
4 (120°)
4 (120°)
4 (120°)
4 (120°)
5 (135°)
5 (135°)
5 (135°)
5 (135°)
6 (150°)
6 (150°)
6 (150°)
6 (150°)
28
32
44
52
40
60
100
200
N (105°)
N (105°)
N (105°)
N (105°)
3. Shell Size -
related directly to current carrying capability.
Size 28 -
40 amperes
Size 32 -
60 amperes
Size 44 - 100 amperes
Size 52 - 200 amperes
4. Master Key/Keyway Position -
N designates normal position. Positions
1, 4, 5 and 6 of the master key/keyway prevent cross-mating of incompat-
ible voltages. Refer to the adjacent illustration.
5. Insert Arrangement -
determined by connector size (current carrying
capability) and cable configuration to be accommodated. Refer to pages 5
& 6.
6. Contact Type -
P for pin, S for socket. MS90555 and MS90557 are sup-
plied with socket contacts
only.
MS90556 and MS90558 are supplied with
pin contacts
only.
7. Alternate Insert Rotation -
used to prevent cross-mating of incompatible
frequencies. Absence of a letter in this space indicates normal (0°) posi-
tion of the insert. Refer to page 7.
MASTER KEY/KEYWAY POSITION
6
5
MASTER
KEYWAY
4
N
Normal
1
TYPICAL
SOCKET
front face of receptacle shown
ARRANGEMENT
Note that insert arrangement does not
rotate with master key/keyway
15
REF
Amphenol Federal Vendor Identification
FSCM77820
4
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