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Heavy Duty Connector RT90558 Wall Mount (Flange Mount) Connector Plug
Heavy duty connector RT90558 is wall mounting plug (flange mount plug) power connector with coupling ring (Equipment End) compatible with MIL-C-22992 (MIL-DTL-22992) CLASS L MS90558 is designed to meet the demands of heavy power interconnections.

Heavy duty connector RT90558 with flange mount ( wall mount ) plug and RT90555 with flange mount receptacle (wall mount connector receptacle) are large size cylindrical connectors (cylinder connectors), highly suitable for industrial or military applications.
The RTI MIL-DTL-22992 (MIL-C-22992) Class “L” connector line is a power connector with current ratings ranging from 40 through 200 amperes. This type of connector is required for all ground power equipment by MIL-STD-454, and are considered the preferred connector under MIL-STD-1453, which mandates its use in all equipment procured by the military. The selection of Class “L” connectors was primarily based on maximum user safety and equipment protection.

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Heavy Duty Connector RT90558 (MIL-DTL-22992 Class L MS90558) Installation Instruction (PDF)
Heavy Duty Connector RT90558 (MIL-DTL-22992 Class L MS90558)
Table of Dimensions
32 RT90558*32 2.250 2.639 2.062 0.959 2.250 2.562 2.062 3.625 0.209
44 RT90558*44 3.000 2.998 2.812 1.021 3.125 3.531 2.812 3.375 0.281
52 RT90558*52 3.500 2.998 3.312 1.021 3.625 4.061 3.156 3.875 0.281
  • RTI Class “L” connectors are equipped with arc quenching chambers to minimize damage to cable or connector and reduce the hazard of live circuit rupture to personnel during the most severe field conditions.
  • Designed with a coupling sequence that engages both the neutral and ground contacts before the power contacts.
  • Socket contacts are recessed well within the dielectric face, which represents a “dead face” to the outside world.
Equipment Protection
  • Connectors are shell polarized (key/keyway) for alternate voltage and phase requirements.
  • Discrimination of 60 Hz & 400 Hz accomplished by alternate nsert positions.
  • Current rating controlled by shell size.
  • Connectors are fully grounded for all AC applications.
Additional Design Features
  • Shells are machined from high strength aluminum and are supplied with conductive or non-conductive finishes.
  • Equipped with necessary seals for waterproofing whether mated, unmatted, capped or uncapped.
  • Crimped or soldered contacts, hand insertable and removable.
  • Quick connect/disconnect for mating and unmating during severe field conditions.
Ordering Information
Connectors are supplied with removable contacts. Contacts are supplied unassembled. Also supplied are applicable accessories as shown below. Additional contacts may be ordered separately by part number. Connectors may be be ordered by RTI part number or we can cross reference the military(MS) part number as shown below.
Part Identification:
RT90558 C 44 4 12 S Z
1 2 3 4 5 6 7
1. Connector Designation
RT 90558 Wall Mounting Plug with Coupling Ring (Equipment End)
2. Shell Finish (ZINC OD)
C: Conductive for Grounded Assemblies.
N: Non-Conductive Assemblies. Figure 1.
3. Shell Size ( 32, 44, 52) Related to current carrying capacity
32 – 60 amperes
44 – 100 amperes
52 – 200 amperes
4. Shell/Keyway Position
1, 4, 5, and 6 positions are available to prevent cross mating of dissimilar voltages. Figure 2.
5. Insert Arrangement
6. Contact Type
P: Pin
S: Socket
7. Alternate Insert Positioning
Discrimination of 60Hz and 400Hz assemblies is accomplished by alternate positioning of inserts.
Figure 2.
Keyway Position
N designates normal position. Four other positions (1, 4, 5, and 6) of the master key/keyway prevent mating of incompatible voltages. Refer to the illustration above for applicability.