P1
MILITARY
PUSHBUTTONS
PUSHBUTTONS PER MIL-PRF-8805/3
(MS25089)
MOMENTARY ACTION, SEALED, SNAP-ACTION, DOUBLE BREAK
The P1 offers a mechanical life that is well beyond the 50,000
cycles required by MIL-PRF-8805. The dual 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 pressure (120g/4.2 oz), low contact resistance
(25mΩ max) and short contact bounce (5ms max) result from
our patented 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.
ELECTRICAL RATINGS:
Load
Resistive
Inductive
Lamp
Motor
Center Contact
DWV
Low Level
Electrical Life:
Mechanical Life:
Seal:
Operating Force:
Reset Force:
Total Travel:
Overtravel:
Style P1-1
Style P1-3
Style P1-8
Style P1-2
Style
P1-5
Style P1-6
Style P1-7
®
Standard Characteristics/Ratings:
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 IP68S
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
Watertight to IP68S available
RoHS & WEEE compliant
Operating Temp Range:
-55°C to +85°C
Movement Differential:
0.015 inches min
MATERIALS:
Case:
Button:
Terminals:
Terminal Hardware:
Mounting Hardware:
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
68
OTTO Full Line Catalog
Specifications Subject To Change Without Notice
P1
MILITARY
PUSHBUTTONS
PUSHBUTTONS PER MIL-PRF-8805/3
(MS25089)
MOMENTARY ACTION, LOW LEVEL UP TO 10 AMPS
P1 PART NUMBER CODE
P1
Case Style
1.
Style A
2.
Style B
3.
Style C
5.
Style E
6.
Style F
7.
Style G
8.
Style H
–
X
Terminal Style
1.
2.
3.
4.
X
X
Circuit Form
1.
N.O.
2.
N.C.
3.
N.C. 3 Terminal
4.
N.O. 3 Terminal
5.
5 Terminal
6.
2 Circuit
X
Switch Action
1.
2.5 lbs. Momentary
2.
4.0 lbs. Momentary
3.
Push-Pull
X
*
Button Color
1.
Red
2.
Black
3.
Orange
4.
Yellow
5.
Green
6.
Blue
7.
Purple
8.
Gray
9.
White
Solder/Std.
Screw/Std.
Solder/Low Level
Screw/Low Level
* Add “W” for watertight to IP86S.
(For watertight seal to MIL-PRF-8805 Design 3, please contact factory.)
Circuit styles with 3 and 5 terminals have 50,000 cycle mechanical life per MIL-PRF-8805.
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.
70
OTTO Full Line Catalog
Specifications Subject To Change Without Notice
SPECIAL PURPOSE DESIGNS
EXAMPLES OF CUSTOMIZED P1 SERIES SEALED PUSHBUTTONS
P1
MILITARY
PUSHBUTTONS
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 S.S.
Housing:
Black anodized aluminum
P1-10047
Long Pushbutton
Dusttight per MIL-S-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 and nine colors of buttons
• Watertight to IP68S
• 10 amp resistive rating
NOTE: Refer to Standard Legends Chart in Appendix
for available symbols.
P1-10142-X
Specifications Subject To Change Without Notice
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71
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