PUSHBUTTONS PER MIL-PRF-8805/3
(MS25089)
MOMENTARY ACTION, SEALED, SNAP-ACTION, DOUBLE BREAK
MILITARY
PUSHBUTTONS
P1
The P1 offers a mechanical life that is well beyond the 50,000
cycles required by MIL-PRF-8805. The double break switching
mechanism has an incredibly fast transfer time, reducing arcing
and increasing contact life. The inherent wiping action breaks
welds and scrubs the contacts clean on every actuation.
The P1 switch offers vastly improved life under extreme
conditions found in most military environments. Moistureproofing
is accomplished in two ways. The pushbutton is sealed with
a silicone boot operating on our patented “rolling sleeve,”
providing longer life and smoother operation over a wide
temperature range. Epoxy seals protect the contacts and
terminals from hostile environments and solder flux.
Watertight sealing to Commercial (IP68S) and Military (MIL-
PRF-8805 Design 3) standards are available. This watertight
design is also available in commercial construction as the
P3 series (add “W” to your part number).
High contact force (120g/4.2 oz), low contact resistance
(25mΩ max) and short contact bounce result from our snap-
action mechanism. These characteristics guarantee exceptional
current carrying capabilities over the life of the switch. With the
optional low level (gold plate) configuration, the P1 is well suited
to interface directly to computers and other solid state devices.
The P1 switch is a quality precision snap-action switch
designed for use in panel boards, control grips, computers,
instruments, pressure switches and other hand or machine
operated applications where sealed pushbutton switches are
required. Its precision permits the P1 to be used as a limit switch
with unique size, high electrical ratings and a wide choice of
mounting styles.
Style P1-1
Style P1-3
Style P1-8
Style P1-2
Style
P1-5
Style P1-6
Style P1-7
®
C
US
Standard Characteristics/Ratings:
ELECTRICAL RATINGS:
Load
Resistive
Inductive
Lamp
Motor
Center Contact
DWV
Low Level
Electrical Life:
Mechanical Life:
Seal:
Sea Level @ 28VDC
or 115VAC, 60/400Hz
10A
5A
3A
3A
3A max
1050Vrms
10mA @ 30mV max DC or peak AC
25,000 cycles
50,000 cycles, circuit forms 3, 4, & 5
250,000 cycles, circuit forms 1, 2 & 6
MIL-PRF-8805 Design 2 or
Watertight per IP68S or MIL-PRF-8805 Design 3
2.5 lbs. or 4.0 lbs.
0.75 lb. or 1.0 lb.
0.085 +/- 0.015 inches
0.012 inches min
50,000 feet @ 28VDC
or 115VAC, 60/400Hz
N/A
5A
N/A
N/A
N/A
400Vrms
Features:
•
•
•
•
•
•
•
•
•
•
Button sealed with patented “rolling sleeve” principle
Contact area sealed at button & terminals
Less than 25mΩ contact resistance
Ideal for low level switching as well as up to
10 amp duty
Positive tactile feedback
Variety of mounting styles
Engraved buttons & bezels available
UL recognized & CSA certified
Watertight to IP68S available
RoHS/WEEE/Reach compliant
Operating Temp Range:
-55°C to +85°C
Operating Force:
Reset Force:
Total Travel:
Overtravel:
Movement Differential:
0.015 inches min
PUSHBUTTONS
MATERIALS:
Case:
Button:
Terminals:
Terminal Hardware:
Mounting Hardware:
Black anodized aluminum alloy
Thermoplastic
Brass with silver plate, gold plate for low level
Screws, lockwasher and solder lugs for screw terminal option
Hex nut and lockwasher, panel seal on watertight switches
Specifications Subject To Change Without Notice
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108
PUSHBUTTONS PER MIL-PRF-8805/3
(MS25089)
MOMENTARY ACTION, LOW LEVEL UP TO 10 AMPS
MILITARY
PUSHBUTTONS
P1
P1 – X X X X X *
Case Style
1.
Style A
2.
Style B
3. Style
C
5. Style
E
6. Style
F
7. Style
G
8.
Style H
P1 PART NUMBER CODE
Terminal Style
1.
Solder/Std.
2.
Screw/Std.
3.
Solder/Low Level
4.
Screw/Low Level
Circuit Form
1.
N.O.
2.
N.C.
3.
N.C. 3 Terminal
➀
4.
N.O. 3 Terminal
➀
5.
5 Terminal
➀
6.
2 Circuit
Switch Action
1.
.5 lbs. Momentary
2
2.
4.0 lbs. Momentary
➁
3.
Push-Pull
Button Color
1.
Red
2.
Black
3. Orange
4. Yellow
5. Green
6. Blue
7. Purple
8.
Gray
9. White
* Add “W” for watertight to IP68S. (For
watertight seal to MIL-PRF-8805 Design 3, please contact factory.)
➀
Circuit styles with 3 and 5 terminals have 50,000 cycle mechanical life per MIL-PRF-8805.
➁
Military standard is 4.0 lbs.
ORDERING INFORMATION:
Select the OTTO P1 series switch to match your application
requirements. Combinations of features are almost unlimited. When
ordering, specify the Military (MS) Number and/or OTTO Part Number.
Example:
P1-32629 is MS25089-3CW, “C” style case, 2 circuit contact
configuration, 4.0 lbs. operating force, white button. For low level
model, specify P1-34629, MS25089-3CWL. A partial cross reference
list of Military (MS) Numbers to OTTO Part Numbers may be found
in the back section of this catalog.
PUSHBUTTONS
Specifications Subject To Change Without Notice
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110
P1
MILITARY
PUSHBUTTONS
SPECIAL PURPOSE DESIGNS
EXAMPLES OF CUSTOMIZED P1 SERIES SEALED PUSHBUTTONS
Special Cap On Press Fit Case
Total Travel:
0.085” +/- 0.015”
Operating Force:
4.0 +/- 1.0 lb.
Reset Force:
1.0 lb. min
Circuit:
SPDT 2 circuit
Mechanical Life:
250,000 cycles
Button:
Black oxide #303 Stainless Steel
Housing:
Black anodized aluminum
P1-10047
Long Pushbutton
Dusttight per MIL-PRF-8805, this extra long
button is installed in a Type P1 “C” case style.
Total Travel:
0.085” +/- 0.015”
Operating Force:
4.0 lbs.
Circuit:
SPNO-DB
Rating:
10 amps Resistive
Mechanical Life:
250,000 cycles
Electrical Life:
25,000 cycles
P1-30074
Special Push-Pull Switch
Total Travel:
0.085” +/- 0.015”
Operating Force:
0.5 lb. to 2.0 lbs.
Circuit:
SPNO-DB
Mechanical Life:
250,000 cycles
Button:
Black on white nylon
Housing:
Black anodized aluminum
Case:
Style “C”
P1-30052
Large Diameter Button
Button diameter is 1.187” and is red anodized
aluminum mounted on a Type P1 style “C” body.
Button is free to rotate 360°.
Total Travel:
0.085” +/- 0.015”
Operating Force:
2.5, +0.5, -1.0 lb.
Circuit:
SPDT 2 circuit
Rating:
10 amps Resistive
Mechanical Life:
250,000 cycles
Electrical Life:
25,000 cycles
P1-30075
Special Knurled Shroud
Total Travel:
0.085” +/- 0.015”
Operating Force:
4.0 +/- 1.0 lb.
Rest Force:
1.0 lb. min
Circuit:
SPDT 2 circuit
Mechanical Life:
250,000 cycles
Button:
Red nylon
Housing:
Black anodized aluminum
P1-90108
Vandal Resistant
Stainless steel housing and button are
watertight sealed. Ideal for unattended
machines operated by the public.
Operating Force:
2.5, +1.0, -0.5 lb.
Circuit:
SPNO-DB
Mechanical Life:
250,000 cycles
Bezel:
1.5” dia.
Button:
0.812” dia.
P1-90135-2
For smaller 0.969” dia., DPDT-DB design,
see P4-10155-2.
• Large buttons, up to 0.765” diameter
• Symbols & 9 colors of buttons
• Watertight to IP68S
• 10 amp resistive rating
NOTE: Refer to Standard Legends Chart in Appendix
for available symbols.
P1-10142-X
111
OTTO Full Line Catalog
Specifications Subject To Change Without Notice
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