The UEC MIL-DTL-22992 QPL'd 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 connector series provide: 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 voltage, current, frequency, phase and grounding requirements Standardization MIL-DTL-22992 Class L insert arrangements specify connector/ cable combinations for maximum reliability Serviceable Contacts contacts are normally crimped to the cable before connector assembly. No insertion tools required. Bushings are available to adapt smaller diameter wires to larger contacts Arc quenching design recessed socket contacts within the insert create an arc suppressing chamber which protects the user when connectors are separated under load. Programmed coupling sequence grounding and neutral contacts engage before power contacts.

Class L connectors are available only in the specific configurations prescribed by MIL-DTL-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.* 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 connector shell are used to distinguish between 60 Hertz and 400 Hertz circuits. 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 eliminates possibility of cable twisting or misalignment.

How to order

Connectors are supplied with removable contacts unassembled and applicable accessories.

Additional/replacement contacts or accessories may be ordered by their corresponding part numbers.

1 Part 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.

Ground Assemblies: Finish C

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 incompatible volt-ages.

Refer to the adjacent illustration.

5 Insert Arrangement – determined by connector size (current carrying
capability) and cable configuration to be accommodated.

6 Contact Type – P for pin, S for socket. MS90555 and MS90557 are
supplied 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°) position of the insert.

As shown in the adjacent illustration, the front face of the pin insert is rotated within the shell in a clockwise direction from the normal shell key. The socket insert would be rotated counterclockwise the same number of degrees in respect to the normal shell key.

To avoid cross-plugging problems in applications requiring the use of more than one connector of the same size and arrangement, alternate insert rotations are available as indicated in the accompanying chart.

United Electronics heavy duty Class L connectors have been exposed to the most rigorous recently updated military environmental conditions, without compromise of mechanical integrity or degradation of electrical performance. Parameters include: