PUSHBUTTONS PER MIL-PRF-8805/3 (MS25089)
MILITARY
PUSHBUTTONS
P1
68 OTTO Full Line Catalog Specifications Subject To Change Without Notice
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
(25mΩmax) 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.
Features:
• Button sealed with patented “rolling sleeve” principle
• Contact area sealed at button & terminals
• Less than 25mΩcontact 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
Style P1-1
Style P1-3
Style P1-6
Style P1-7
Style
P1-5
Style P1-2
Standard Characteristics/Ratings:
ELECTRICAL RATINGS:
Load Sea Level @ 28VDC 50,000 feet @ 28VDC
or 115VAC, 60/400Hz or 115VAC, 60/400Hz
Resistive 10A N/A
Inductive 5A 5A
Lamp 3A N/A
Motor 3A N/A
Center Contact 3A max N/A
DWV 1050Vrms 400Vrms
Low Level 10mA @ 30mV max DC or peak AC
Electrical Life: 25,000 cycles
Mechanical Life: 50,000 cycles, circuit forms 3, 4, & 5
250,000 cycles, circuit forms 1, 2 & 6
Seal: MIL-PRF-8805 Design 2 or IP68S
Operating Temp Range: -55°C to +85°C
Operating Force: 2.5 lbs. or 4.0 lbs.
Reset Force: 0.75 lb. or 1.0 lb.
Total Travel: 0.085 +/- 0.015 inches
Overtravel: 0.012 inches min
Movement Differential: 0.015 inches min
MATERIALS:
Case: Anodized aluminum alloy
Button: Thermoplastic
Terminals: Brass with silver plate, gold plate for low level
Terminal Hardware: Screws, lockwasher and solder lugs for screw terminal option
Mounting Hardware: Hex nut and lockwasher, panel seal on watertight switches
Style P1-8
®
PUSHBUTTONS PER MIL-PRF-8805/3 (MS25089) MILITARY
PUSHBUTTONS
P1
Specifications Subject To Change Without Notice www.ottoexcellence.com 69
PUSHBUTTONS
MOMENTARY ACTION, LOW LEVEL UP TO 10 AMPS
Watertight P1-90024
Dusttight P1-90014
Operating Force: 4.0 +/- 1.0 lb.
Circuit: SPST-N.O.
Case: Black anodized aluminum
Button: Red nylon
P1-6 (MIL-F)
P1-5 (MIL-E)
P1-3 (MIL-C)
P1-2 (MIL-B)
P1-1 (MIL-A) P1-7 (MIL-G)
P1-8 (MIL-H)
Unsealed P1-90013
Operating Force: 5.0 lbs. max
Circuit: SPDT-DB
Case: Black anodized aluminum
Button: Black nylon
70 OTTO Full Line Catalog Specifications Subject To Change Without Notice
MOMENTARY ACTION, LOW LEVEL UP TO 10 AMPS
PUSHBUTTONS PER MIL-PRF-8805/3 (MS25089)
MILITARY
PUSHBUTTONS
P1
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.
Case Style Terminal Style Circuit Form Switch Action Button Color
1. Style A
2. Style B
3.Style C
5. Style E
6. Style F
7. Style G
8.Style H
1. Solder/Std.
2.Screw/Std.
3.Solder/Low Level
4. Screw/Low Level
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
1. 2.5 lbs. Momentary
2.4.0 lbs. Momentary
➁
3.Push-Pull
1. Red
2. Black
3.Orange
4. Yellow
5. Green
6. Blue
7.Purple
8.Gray
9. White
P1 PART NUMBER CODE
P1 – X X X X X *
* Add “W” for watertight to IP86S. (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.
➁Military standard is 4.0 lbs.
SPECIAL PURPOSE DESIGNS
Specifications Subject To Change Without Notice www.ottoexcellence.com 71
PUSHBUTTONS
EXAMPLES OF CUSTOMIZED P1 SERIES SEALED PUSHBUTTONS
MILITARY
PUSHBUTTONS
P1
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
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
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.
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
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
• 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
