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JACKS AND PLUGS
FAX: 773 792-2129 LONG FRAME TELEPHONE TWIN JACKS
* Please visit the product pages on our website for the most up-to-date product information
1/4" LONG FRAME TELEPHONE TWIN JACKS
SPECIFICATIONS
Frame and Stack Screws: Steel, plated with iridescent
iridite finish.
Springs: Copper alloy, spring tempered. Solder lugs are
solder coated.
Bushings: Nickel-plated copper alloy.
Contacts: Welded crossbar palladium in shunt circuits.
85
MT389
MT388
Insulation: Rigid plastic (MIL-type PBE-P, per MIL
Specification LP-513C). Extruded plastic insulating tubing
through stack.
ORDERING
Order by part number from table.
WMT389
Part
Number 1
MT388
Adjusted for Plug
WEco types 298B and 347B
Dim. “X” max.
Inch (mm)
.562 (14.3)
MIL types M642/9-1 and M642/1-1
High quality telephone jacks are essentially doubled versions
? WMT388
MT389
Switchcraft types 411, 412, 413, 420
WEco type 310
MIL types M642/2-1 and M642/2-2
.562 (14.3)
.594 (15.1)
of MT-Jax ? . Twin-Jax ? are used in Switchcraft Series 2400,
WMT389
Switchcraft types 414 and 482
.562 (14.3)
2600 and JP ? Jack Panels and other standard jack panels.
Twin-Jax ? have direct WEco equivalents.
MT388 AND WMT388
Frame mounting ears are on 1.375" centers, and bushings
are on .625" centers. Jacks are double, 2-conductor type with
a crossover wiring feature. If a mating plug is inserted in
either bushing, crossover contacts are opened (see
schematic). MT388 (solder lugs) is equivalent to WEco jack
410A, 410C and 410D. WMT388 (wire-wrapping) is equivalent
to WEco 410AM.
MT389 AND WMT389
Double, 3-conductor jacks with both the tip and ring circuits
interconnected (crossover wired) so if a plug is inserted in
either jack, common circuits are opened (see schematic).
? Special Order only; contact Switchcraft.
1. Number MT388 is equivalent to MIL-type M641/11-1
2. Complete data for telephone and MIL-type plugs are contained in this section.
Mounting Screws: #6-32, Part Number P10725, can be ordered separately.
Contact Switchcraft. (Screws not supplied with jacks).
SCHEMATIC CIRCUITS
MT388 and
MT-389 (solder lugs) is equivalent to WEco 482A. WMT389
(wire-wrapping) is equivalent to WEco 482AM and 482BM.
WMT388
MT389 and WMT389
MT388 and WMT388
DIMENSIONS ARE FOR REFERENCE ONLY
Inch
(mm)
MT389 and WMT389
SWITCHCRAFT, INC. 5555 N. Elston Ave. ? Chicago, IL 60630
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