Series I, LJT Breakaway Fail Safe
Lanyard Release Plug How to Order, cont.
HOW TO ORDER-MILITARY
FAIL SAFE MS27661
1.
MS
Number
2.
Service
Class
3.
Shell
Size
4.
Finish
5.
Insert
Arrg.
6.
Contact
Style
7.
Alternate
Position
HOW TO ORDER-COMMERCIAL
FAIL SAFE 88-5388 OR 91-5388
1.
Finish
38999
III
Dualok
II
I
SJT
Access
Aquacon
MS27661
T
17
B
35
P
A
2.
3.
Connector
Shell Size
Type
& Insert
Identification Arrangement
4.
Lanyard
Length Code
5.
Contact Type
Alternate
Rotation of Insert
1. MS27661 NUMBER
MS Number designates MIL-DTL-38999, Series I
LJT Lanyard Release Plug
88
5388
29
40
P
1. SELECT A FINISH
Designates corrosion
1. SELECT A FINISH
resistant olive drab cadmium plate over
2. SELECT A SERVICE CLASS
6. SELECT A CONTACT STYLE
E
T
88
nickel, 500 hour extended salt spray, EMI –50dB @ 10 GHz
specification min., 175°C
Designates electroless nickel plated aluminum,
cation min., 48 hour salt spray, 200°C
For environmental crimp applications
(inactive for new design)
For environmental crimp applications with
serrations on rear threads of shell
91
optimum EMI shielding effectiveness –65dB @ 10 GHz specifi-
Series I
These are standard finishes. Consult Amphenol Aerospace,
Sidney, NY for variations.
3. SELECT A SHELL SIZE
MIL-DTL-38999, sizes 11 through 25, see chart on page 140.
2. CONNECTOR TYPE IDENTIFICATION
Release Plug
2. CONNECTOR TYPE IDENTIFICATION
5388
Designates MIL-DTL-38999, Series I LJT Lanyard
4. SELECT A FINISH
B
Designates corrosion resistant olive drab cadmium plated
aluminum, 500 hour extended salt spray,
EMI shielding effectiveness –50dB @ 10 GHz
specification min., 175°C
Designates electroless nickel plated aluminum,
48 hour salt spray, EMI shielding effectiveness –65dB @10
GHz500 specification min., 200°C
3. SELECT A SHELL SIZE & INSERT ARRANGEMENT
Shell sizes are MIL-DTL-38999, Series III from sizes 11 thru 25. The basic
part number selected specifies the insert arrangement. See Table I (page
140) for coded part number that correlates to insert arrangement.
F
4. SELECT A LANYARD LENGTH CODE
See Table II (page 140) for lanyard length code number.
These are standard finishes. Consult Amphenol
Aerospace for variations.
5. SELECT AN INSERT ARRANGEMENT
MIL-DTL-38999, see insert identification chart on page 140.
5. SELECT A CONTACT TYPE/ALTERNATE
ROTATION OF INSERT
P
S
Designates Lanyard Release plug with pin contacts
Designates Lanyard Release plug with socket contacts
6. SELECT A CONTACT STYLE
P
S
Designates Lanyard Release plug
with pin contacts
Designates Lanyard Release plug
with socket contacts
AB
NORMAL
A
D
When an alternate position of the connector is required to prevent cross-
mating, a different letter (other than P or S) is used. See
alternate positioning for LJT (to your left), then convert to Amphenol com-
mercial coding by the following chart below.
B
C
ROTATION
LETTERS
7. ALTERNATE KEYING
POSITION
For alternate position of
connector (to prevent cross-mating)
see LJT key/keyway rotation below.
(No letter is required for normal)
5° LJT REF
RELATIVE POSSIBLE POSITION
OF ROTATED MASTER KEYWAY
(front face of receptacle shown)
Pin Contacts
MS Letter
Amphenol
Letter
P
PA
PB
PC
PD
P (normal)
E
R
W
Y
Socket Contacts
MS Letter
Amphenol
Letter
S
SA
SB
SC
SD
S (normal)
F
T
X
Z
LJT
Key/Keyway Rotation
AB ANGLE OF ROTATION (Degrees)
Shell Size
Normal
95°
95°
95°
95°
95°
95°
95°
95°
95°
A
77°
81°
75°
74°
77°
77°
77°
80°
80°
B
-
67°
63°
61°
65°
C
-
123°
127°
129°
125°
125°
125°
121°
121°
9
11
13
15
17
19
21
23
25
65°
65°
69°
69°
D
113°
109°
115°
116°
113°
113°
113°
110°
110°
C
139
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
Series I, LJT Breakaway Fail Safe
Lanyard Release Plug Insert Availability
38999
III
Dualok
II
I
SJT
Access
Aquacon
INSERT AVAILABILITY
Shell Size /
Insert
Arrangement
11-2
11-35
11-98
13-4
13-8
13-35
13-98
15-5
15-15
15-18
15-19
15-35
15-97
17-6
17-8
17-26
17-35
17-99
19-11
19-32
19-35
21-11
21-16
21-35
21-39
21-41
23-21
23-35
23-53
23-54
23-55
25-4
25-19
25-20
25-24
25-29
25-35
25-43
25-46
25-61
TABLE I
INSERT ARRANGEMENT CODE
Contact Size
12
8
Coax Coax*
8
Twinax
Basic Part
Number
88/91-538808
06
07
10
11
13
14
18
22
19
20
27
28
29
30
31
37
39
40
47
48
49
50
51
57
58
59
60
66
74
67
68
69
70
71
72
Service
Rating
I
M
I
I
I
M
I
II
I
I
I
M
I
I
II
I
M
I
II
I
M
I
II
M
I
I
II
M
I
M
I
I
I
N
I
I
M
I
I
I
Total
Contacts
2
13
6
4
8
22
10
5
15
18
19
37
12
6
8
26
55
23
11
32
66
11
16
79
39
41
21
100
53
53
55
56
19
30
24
29
128
43
46
61
MIL-DTL-38999 Insert
Arrangement
11-99
11-35
11-98
13-4
13-8
13-98
13-35
15-5
15-18
15-19
15-35
17-6
17-8
17-26
17-35
17-99
19-11
19-32
19-35
21-11
21-16
21-35
21-41
21-39
23-21
23-35
23-53
23-55
25-19
25-4
25-29
25-35
25-43
25-61
25-46
25-2
22D
13
20
16
2
12
6
4
8
22
10
5
14
18
19
37
8
4
6
8
26
55
21
32
66
11
16
79
37
41
21
100
53
40
55
48
10
8
19
13
12
29
128
23
40
61
* For RG 180/U and RG 195/U cables
only. (Check Amphenol Aerospace,
Sidney, NY for other cable
applications). For availability of other
insert arrangements and accesso-
ries consult Amphenol Aerospace.
20
4
2*
12
4
3
9
4
2
2
11
1
Series I
TABLE II
LANYARD LENGTH
CODES
Lanyard
Length (in.)
±.250
4.000
4.250
4.500
4.750
5.000
5.250
5.500
5.750
6.000
6.250
6.500
6.750
7.000
7.250
7.500
7.750
8.000
8.250
8.500
8.750
9.000
9.250
9.500
9.750
MS
Commercial
Code
40
41
42
43
50
51
52
53
60
61
62
63
70
71
72
73
80
81
82
83
90
91
92
93
No
Code
Std.
Length
6.250
LJT Lanyard Separation Forces
Straight Plug
(lbs. max.)
45
15 Degree
Pull (lbs.
Max.)
55
C
140
Shell Size
11
13
15
17
19
21
23
25
90
100
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
Series I, LJT Breakaway Fail Safe
Quick-Disconnect with Axial Pull of Lanyard
Amphenol LJT Breakaway Fail Safe Connectors provide unequaled
performance in environments requiring instant disengagement.
Designed to provide quick disconnect of a connector plug and
receptacle with an axial pull on the lanyard, the “Breakaway” Fail Safe
connector family offers a wide range of electrical and
mechanical features:
• Instant decoupling and damage free separation
• Completely intermateable with standard LJT receptacles
• Inventory support commonality through the use of standard
insert arrangements and contacts
Breakaway un-mating is initiated by applying a pull force to the
lanyard which causes the operating sleeve on the plug to move away
from the receptacle. Coupling segments on the plug then move away
from the mating receptacle while expanding, thus releasing the recep-
tacle. After completion of the un-mating sequence, spring compression
returns the sleeve and segments to their original positions. Un-mating of
the plug may also be accomplished by normal rotation of the coupling
ring without affecting the breakaway capability.
The LJT Breakaway Fail Safe connector features which provide EMI EMP
shielding in excess of MIL-DTL-38999 Series I requirements:
• Solid metal-to-metal coupling
• EMI grounding fingers
• Conductive finishes
Contact Amphenol Aerospace for more information on breakaway,
quick-disconnect connectors. Other Amphenol cylindrical families
(MIL-DTL-38999 Series III, MIL-DTL-26482, MIL-DTL-83723) also offer
breakaway quick-disconnect connectors.
38999
III
Dualok
II
I
SJT
Access
Aquacon
LJT Breakaway Fail Safe
In addition to standard Breakaway connectors,
Amphenol also manufactures custom breakaway
connectors including those with:
•
•
•
•
•
Increased pull-force capability
Custom lanyard lengths and backshells
Low force separation capabilities
Low insertion/separation force contacts
Non-cadmium finishes
Series I
Custom JT Series Breakaway designs have been
developed for special applications; however the LJT
Series is recommended over the JT Series for the
quick-disconnect breakaway style.
Lanyard Release Plug - Fail Safe
Military (MS27661)
Commercial (LJT 88-5388/91-5388)
To complete order number see page 140.
+.007
.575
–.003
SOCKET INSERT
.594
–.002
+.003
.275 MAX.
OUTER SLEEVE
MOVEMENT
DURING MATING
V
.019
–.003
+.012
PIN INSERT
Shell
Size
11
13
A Dia.
Max.
1.393
1.558
1.669
1.797
1.926
2.054
2.183
2.293
B Max.
1.797
1.969
2.078
2.203
2.323
2.469
2.594
2.703
D Max.
Accessory
Dia.
.740
.926
1.051
1.176
1.300
1.426
1.551
1.676
L Max.
1.703
1.703
1.703
1.703
1.703
1.703
1.703
1.766
V Thread
UNEF
Class 2A
(Plated)
.5625-24
.6875-24
.8125-20
.9375-20
1.0625-18
1.1875-18
1.3125-18
1.4375-18
D
B
15
17
19
21
LANYARD
PULLED TAUT
AGAINST A
.500
±.031
DIA. MANDREL
L
MS LANYARD LENGTH
6.250
STD.
FOR PROPRIETARY LANYARD LENGTH
SEE LANYARD LENGTH TABLE
A
23
25
All dimensions for reference only.
C
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
141
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