MILITARY—ENVIRONMENTALLY SEALED SWITCHES
Series—8503, 8504, 8505
MIL-S-3950 Lever Lock Switches
FEATURES
• Environmentally sealed
• 1, 2, and 4 pole circuitry
• 2 & 3 position with maintained and
momentary action
• Locking actuator for safety
• Molded-in terminal inserts and terminal
numbers
SPECIFICATIONS
• Environmentally sealed per MIL-S-3950
• MS approved and QPL’d per MIL-S-3950
• Thermoset molding materials meet flame
retardant requirements of
• Bushing: 15/32" - 32 thread
• Temperature Range: -85°F to +160°F
(-65°C to +71°C)
• Life: 20,000 operations at rated load
40,000 operations mechanical life
CURRENT RATINGS
No. of Catalog
Type of
Poles Number Operation
28VDC
Lamp Resistive Inductive
Load
Load
Load
5
20
15
4
15
10
7
20
15
5
18
10
5
20
12
4
18
10
115VAC
60 or 400Hz
Lamp Resistive Inductive
Load
Load
Load
3
15
10
2
15
7
4
15
15
2
11
8
4
15
15
2
11
8
1
2
4
8503
8504
8505
Maintained
Momentary
Maintained
Momentary
Maintained
Momentary
Minimum Rating: “Intermediate Current” per MIL-S-3950
LEVER LOCK SELECTION T ABLE
8503
CIRCUIT WITH LEVER IN...
Up
Position
Center
Position
Down
Position (Keyway)
Lever
x
Lock
Bushing
Style
A
B
D
E
F
G
H
J
K
L
M
N
P
D
F
G
D
F
G
E
F
K
M
F
F
E
L
N
E
F
F
E
F
K
L
8504
TWO POLE
Flush Screw Terminals
MS Part
Catalog
Number
Number
MS24659-21A
-21B
-21D
-21E
-21F
MS24659-21G
-21H
-21J
-21K
-21L
MS24659-21M
-21N
-21P
-22D
-22F
MS24659-22G
-23D
-23F
-23G
-24E
MS24659-24F
-24K
-24M
-25F
-26F
MS24659-27E
-27L
-27N
-28E
-29F
MS24659-30F
-31E
-31F
-31K
-31L
8504K1
K27
K5
K2
K28
8504K3
K29
K30
K31
K32
8504K33
K4
K34
K10
K35
8504K9
K6
K36
K7
K16
8504K37
K38
K11
K22
K20
8504K12
K39
K14
K15
K21
8504K19
K18
K40
K41
K13
8505
FOUR POLE
Flush Screw Terminals
MS Part
Catalog
Number
Number
MS24660-21A
-21B
-21D
-21E
-21F
MS24660-21G
-21H
-21J
-21K
-21L
MS24660-21M
-21N
-21P
-22D
-22F
MS24660-22G
-23D
-23F
-23G
-24E
MS24660-24F
-24K
-24M
-25F
-26F
MS24660-27E
-27L
-27N
-28E
-29E
MS24660-30F
-31E
-31F
-31K
-31L
8505K1
K27
K5
K2
K28
8505K3
K29
K30
K31
K32
8505K33
K4
K34
K10
K35
8505K9
K6
K36
K7
K16
8505K37
K38
K11
K22
K20
8505K12
K39
K14
K15
K21
8505K19
K18
K40
K41
K13
ONE POLE
Flush Screw Terminals
MS Part
Catalog
Number
Number
MS24658-21A
-21B
-21D
-21E
-21F
MS24658-21G
-21H
-21J
-21K
-21L
MS24658-21M
-21N
-21P
-22D
-22F
MS24658-22G
-23D
-23F
-23G
-24E
MS24658-24F
-24K
-24M
-25F
-26F
MS24658-27E
-27L
-27N
-28E
-29F
MS24658-30F
-31E
-31F
-31K
-31L
8503K1
K27
K5
K2
K28
8503K3
K29
K30
K31
K32
8503K33
K4
K34
K10
K35
8503K9
K6
K36
K7
K16
8503K37
K38
K11
K22
K20
8503K12
K39
K14
K15
K21
8503K19
K18
K40
K41
K13
*
*
*
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON
ON§
ON§
ON
ON§
ON§
ON
ON
ON§
ON§
ON§
ON§
ON§
ON
ON
ON
NONE
ON§
OFF§
ON
ON§
ON§
ON
OFF§
OFF§
OFF
OFF§
OFF
OFF
OFF§
OFF
OFF§
OFF§
OFF
OFF
OFF§
NONE
NONE
NONE
NONE
NONE
NONE
OFF
OFF
OFF§
OFF
OFF
NONE
OFF§
OFF§
OFF
OFF§
NONE
NONE
OFF§
OFF
OFF§
OFF§
*
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
NONE
NONE
NONE
NONE
NONE
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
*
*
*
*
*
*
*
*
*
*
*
Moment ry contact.
*
Indicatesadirection against which lever is locked.
§
See page 73 for circuit diagrams.
x
Reference bushing styles on Page 34.
MILITARY—ENVIRONMENTALLY SEALED SWITCHES
Series—8503, 8504, 8505
LEVER LOCK SELECTION TABLE, CON’T.
MIL-S-3950 Lever Lock Switches
8503
CIRCUIT WITH LEVER IN...
Up
Position
Center
Position
Down
Position (Keyway)
Lever
x
Lock
Bushing
Style
M
N
E
E
F
K
M
A
B
D
E
F
G
H
J
K
L
M
N
P
E
F
K
L
M
N
E
L
N
A
B
D
E
F
G
H
J
K
L
M
N
P
E
F
K
L
M
N
E
L
N
B
8504
TWO POLE
Flush Screw Terminals
MS Part
Catalog
Number
Number
MS24659-31M
-31N
-32E
-33E
-33F
MS24659-33K
-33M
MS27408-1A
-1B
-1D
MS27408-1E
-1F
-1G
1H
-1J
MS27408-1K
-1L
-1M
-1N
-1P
MS27408-2E
-2F
-2K
-2L
-2M
MS27408-2N
-3E
-3L
-3N
-4A
MS27408-4B
-4D
-4E
-4F
-4G
MS27408-4H
-4J
-4K
-4L
-4M
MS27408-4N
-4P
-5E
-5F
-5K
MS27408-5L
-5M
-5N
-6E
-6L
-6N
-7B
8504K17
K8
K23
K24
K25
8504K26
K42
K43
K44
K45
8504K46
K47
K48
K49
K50
8504K51
K52
K53
K54
K55
8504K56
K57
K58
K59
K60
8504K61
K62
K63
K64
K65
8504K66
K67
K68
K69
K70
8504K71
K72
K73
K74
K75
8504K76
K77
K78
K79
K80
8504K81
K82
K83
K84
K85
K86
K87
8505
FOUR POLE
Flush Screw Terminals
MS Part
Catalog
Number
Number
MS24660-31M
-31N
-32E
-33E
-33F
MS24660-33K
-33M
MS27409-1A
-1B
-1D
MS27409-1E
-1F
-1G
-1H
-1J
MS27409-1K
-1L
-1M
-1N
-1P
MS27409-2E
-2F
2K
-2L
-2M
MS27409-2N
-3E
-3L
-3N
–
–
8505K17
K8
K23
K24
K25
8505K26
K42
K43
K44
K45
8505K46
K47
K48
K49
K50
8505K51
K52
K53
K54
K55
8505K56
K57
K58
K59
K60
8505K61
K62
K63
K64
–
–
ONE POLE
Flush Screw Terminals
MS Part
Catalog
Number
Number
MS24658-31M
-31N
-32E
-33E
-33F
MS24658-33K
-33M
–
–
–
–
8503K17
K8
K23
K24
K25
8503K26
K42
–
–
–
–
*
*
*
*
*
*
*
ON§
ON
ON
ON
ON§
ON§
ON§
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON
ON
ON§
ON§
ON
ON§
ON
ON
ON
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON§
ON
ON
ON
ON§
ON§
ON
ON§
ON
ON
ON
ON
ON
OFF
OFF
ON§
ON§
ON
ON§
ON
ON§
ON§
ON
ON§
ON
ON
ON§
ON
ON§
ON§
ON
ON
ON§
ON§
ON
ON§
ON§
ON
ON
ON§
ON§
ON
ON§
ON§
ON
ON§
ON
ON
ON§
ON
ON§
ON§
ON
ON
ON§
ON§
ON
ON§
ON§
ON
ON
ON§
ON§
ON
ON§
ON
ON
NONE
NONE
NONE
NONE
NONE
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
*
*
–
–
*
*
*
*
*
*
*
*
*
–
–
–
–
–
–
–
–
–
–
*
*
*
*
*
*
*
*
*
–
–
–
–
–
–
–
–
–
–
–
–
Momentary contact.
§
Indicates direction against which lever is locked.
See page 73 for circuit diagrams.
x
Reference bushing styles on Page 34.
*
MILITARY—ENVIRONMENTALLY SEALED SWITCHES
Series—8503, 8504, 8505
MOUNTING DIMENSIONS—ONE POLE / 8503
MIL-S-3950 Lever Lock Switches
Terminal Identification
MOUNTING DIMENSIONS—TWO POLE / 8504
STANDARD
0.00 = inches
[0,0] = mm
Mounting dimensions for reference only.
Non-functional terminals not supplied.
Terminal Identification
MILITARY—ENVIRONMENTALLY SEALED SWITCHES
Series—8503, 8504, 8505
MOUNTING DIMENSIONS—FOUR POLE / 8505
MIL-S-3950 Lever Lock Switches
Terminal Identification
Non-functional terminals not supplied.
OPTIONS/ACCESSORIES
• Special mounting hardware
• Mounting hardware furnished assembled
• Terminal screws furnished assembled
• Substitute sems screws
• Special circuits
• Panel seal, part number 32-341 (See Accessories
and Custom Components section)
• Special shaped caps available
• Custom wiring harnesses
LEVER LOCK – BUSHING STYLES
KEYWAY SIDE
PANEL CUTOUT DIMENSIONS
STANDARD
0.00 = inches
[0,0] = mm
Mounting dimensions for reference only.
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