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 initial) 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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127
PUSHBUTTONS PER MIL-PRF-8805/3
(MS25089)
MOMENTARY ACTION, LOW LEVEL UP TO 10 AMPS
MILITARY
PUSHBUTTONS
P1
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
X
P1 PART NUMBER CODE
X
X
X
*
Button Color
1.
Red
2.
Black
3.
Orange
4.
Yellow
5.
Green
6.
Blue
7.
Purple
8.
Gray
9.
White
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.
2.5 lbs. Momentary
2.
4.0 lbs. Momentary
➁
3.
Push-Pull
1.
Solder/Std.
2.
Screw/Std.
3.
Solder/Low Level
4.
Screw/Low Level
* 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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129
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