RA70B14B【PDF 87/333 页】CONN JACK R/A 3-COND DBL CLOSED

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LONG FRAME TELEPHONE JACKS

82

JACKS AND PLUGS

PHONE: 773 792-2700

* Please visit the product pages on our website for the most up-to-date product information

LONG FRAME TELEPHONE JACKS

MT-Jax ?

(“A” Frame)

MT-Jax ? jacks Numbers ? MT-342B and ? MT-344B have

shorter bushings, 0.5" long with a hold inside diameter of

.21". They will mate with MIL plug M642/5-1 or M642/8-1.

M642/5-1 plug (Switchcraft 480) cannot be used with

? MT-342B or ? MT-344B if these jacks are mounted on standard

.625" thick panels. The short jack bushings are recessed

.125", and the M642/5-1 is too wide to fit in the panel recess.

Use plug M642/8-1 (Switchcraft 484) with a narrower

MT-Jax ?

(“C” Frame)

WMT-Jax ? , Number

WMT-332B

XMT-Jax ? , Number

XMT-332A

YMT-Jax ? , Number

YMT-332B

diameter to fit in the recess and mate properly.

CONTACTS – Contacts on shuts and isolated switching

circuits are welded crossbar palladium. Welded crossbar gold

alloy contacts (WEco #1) are available on special order for dry

circuit applications.

SPECIFICATIONS

Frame and Stack Screws: Plated steel, with iridescent

iridite finish.

Springs: Copper alloy, spring tempered. Solder lugs are tinned.

Bushings: Plated copper alloy standard. Natural brass finish

optional.

Insulation: Rigid plastic spacers (MIL-type PBE-P per

Details of Typical Buss Wiring of Jacks

with Offset Ground Lugs

Ground Lug “Toward”

Frame (Y Offset)

Buss Wire

Between

Rows

Buss Wire

Specification LP-513). One piece molded through stack.

Contacts: Welded crossbar palladium contacts in shunt and

isolated switching circuits are standard. Gold alloy (WEco #1)

and fine silver are available on special order.

MECHANICAL

Life: Commercial jacks: 10,000 insertion/withdrawal cycles, minimum.

Military Jacks: 20,000 insertion/withdrawal cycles, minimum.

Mechanical Shock: Military Jacks – Per MIL-STD-202,

method 213, Test Condition H (75g).

Vibration: Military Jacks – Per MIL-STD-202, method 213, (10-55 Hz).

ELECTRICAL

Ground Lug

“Toward” Frame

Ground Lug “Away”

from Frame (X Offset)

Outside of

Rows

Contact Resistance: Commercial Jacks – .030 ohms

maximum (initial), .050 ohms maximum (after humidity, durability

exposure). Military Jacks – .010 ohms maximum (initial), .020

Long frame jacks are designed especially for high quality

communication equipment, and to meet exacting MIL

specifications, as well as telephone and communication systems.

Many jacks have WEco equivalent types. MT-Jax ? phone jacks are

offered in four styles: MT-Jax ? , WMT-Jax ? , XMT-Jax ? and YMT-Jax ? .

Rugged steel frames are produced in specially designed dies,

press welded to provide rigidity and dimensional stability required

by telephone and communication jack panels - and to meet MIL

frame strength tests. “A” and “C” frame styles are available.

TERMINALS – Solder Lug: All MT-Jax ? have solder lug termi-

nals. Wire-Wrapping Terminals: WMT-Jax ? have wire-wrapping ter-

minals. Offset Ground Lugs: XMT-Jax ? and YMT-Jax ? have ground

lugs, which simplify production line wiring time. A single row of

jacks can be installed with a single buss wire connected to all

ground lugs in a row, or when double rows are mounted on .625"

vertical centers with lugs oriented between rows, holes in ground

lugs line up so a single buss wire provides connections for both

rows. XMT-Jax ? have ground lugs oriented away and YMT-Jax ? are

oriented toward jack frame. See illustration.

MIL STANDARDIZATION – MIL jack types listed have been

adjusted for use with plugs specified in Amendment No.1, MIL-P-642,

usually M642/1-1, M642/1-2, M642/2-1, M642/2-2, M642/4-1 or

M642/4-2. When applicable, specify the plug you will use; we will

adjust with that plug where the item is not a MIL-type. NOTE:

ohms maximum (after life), .10 ohms maximum (after salt spray).

Insulation Resistance: Commercial Jacks – 10,000 M ?

minimum (initial), 1,000 M ? minimum (after humidity). Military

Jacks – 10,000 M ? minimum (initial), 1,000 M ? minimum (after

humidity, durability exposure).

Dielectric Withstanding Voltage: 500 V, 60 Hz (rms) AC.

ENVIRONMENTAL

Thermal Range: Commercial Jacks – -55°C to +85°C

(non-operating); -20°C to +65°C (operating). Military Jacks -

-55°C to +85°C (non operating); -40°C to +65°C (operating).

Thermal Shock: Commercial Jacks – Per MIL-STD-202,

method 107. Military Jacks – Per MIL-STD-202, method 107.

Humidity: Commercial Jacks – Per MIL-STD-202, method

106. Military Jacks – 0% to 95% operating and non-operating.

Salt Spray: Commercial Jacks – Per MIL-STD-202, method

101. Military Jacks – Per MIL-STD-202, method 101 (48 hours).

Moisture Resistance: Military Jacks – Per MIL-STD-202,

method 106 (240 hours).

ORDERING – Order jacks by part number. Additional variations

in jacks are available on special order. Special circuitry, frames,

contacts, natural brass bushings, as other terminals are available.

DIMENSIONS ARE FOR REFERENCE ONLY

www.switchcraft.com

Inch

(mm)

? Registered trademark of Switchcraft, Inc.

Note: Contact your Switchcraft Representative for price and delivery

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