Multi-Deck Rotary Switches
SPECIFICATIONS:
MIL-S-3786 Electrical Values
Military Style
Mounting Bushings: Brass, tin/zinc-plated.
TheseswitchesalsomeetMIL-ꢀTL-3786/SR04
formoistureresistance,mediumandhighshock,
vibration (10 to 2000 cps), thermal shock (-
65°C to 125°C), salt spray, explosion and
terminal pull.
Style M switches, at 85°C, approximately
68% humidity and sea level pressure and
style H and HS at 125°C have been tested to
make and break the following loads as stated
in MIL-ꢀTL-3786/SR04; 250 milliamperes at
28 Vdc resistive, 100 milliamperes at 28 Vdc
inductive (2.8 henries); 75 milliamperes at
115 Vac resistive.
Shaft, Cover Plate, Retaining Rings,
Through Bolts, Shaft Extensions, Stop
Arm, Stop Washers, Thrust Washers and
Rear Support Plate: Stainless steel
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
Rotor Contact: Silver alloy
Terminals, Common Plate including
Solder Lug: Brass, silver-plated .0003"
minimum
Mounting Hardware: Two mounting nuts
.094" thick by .562" across flats and one
internal tooth lockwasher are supplied with
each switch.
Stud Nuts, Mounting Nuts, Lock Washers:
Tin/zinc-plated or stainless steel.
Materials and Finishes
Standard Style
Bases: Melamine per (MIL-M-14) ꢁSTM-ꢀ-
5948
Cover,DeckSeparators,EndPlateandRotor
Mounting Plate: Phenolic per (MIL-M-14)
ꢁSTM-ꢀ-5948
Mounting Bushings: Brass, tin/zinc-plated.
Shaft,CoverPlate,RetainingRings,Through
Bolts, Shaft Extensions, Stop Arm, Thrust
Washers Stop Washers and Rear Support
Plate: Stainless Steel
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
RotorContact,Stator(Base)Contacts:Silver
alloy
Terminals(ExceptCommon):Brass,tinplated
CommonPlate,IncludingSolderLug:Brass,
silver-plated .0003" minimum
MountingHardware:Twomountingnuts.094"
(2,39) thick by .562" (14,27) across flats and
one internal tooth lockwasher are supplied
with each switch.
These switches have also been tested at
reduced barometric pressure (70,000 feet),
25°C at approximately 68% relative humidity
to make and break the following loads as
stated in MIL-ꢀTL-3786/SR04; 200
milliamperes,28Vdcresistive;25milliamperes,
28 Vdc inductive (2.8 henries); 20
milliamperes, 115 Vac resistive. When tested
to these loads and conditions the style M, H
andHSswitchesmeetthefollowinglifelimiting
or failure criteria after 25,000 cycles in
accordance with MIL-S-3786.
Additional Characteristics
Standard Style and Military Qualified
Contact: Shorting or non-shorting wiping
contacts with over 150 grams of contact
force
Rotational Torque: 8-115 ounce-inches
depending upon the number of poles per
deck, number of decks and angle of throw
Mechanical Life Expectancy: 100,000
cycles of operation
Shaft Flat Orientation: Flat opposite
contacting position of pole number one (See
circuit diagram).
StopStrength:ForStandardstyle:15pound-
inches minimum. For ꢁdjustable stop styles:
12 pound-inches
ContactResistance:50milliohmsmaximum
Insulation Resistance: 1,000 megaohms
minimum between terminals and shafts
DielectricStrength:1,000Vac(atmospheric
pressure) and 450 Vac (reduced pressure)
minimum between mutually insulated parts.
When tested at sea level 25°C and 68%
relative humidity with failure criteria of 50
milliohms max. and 750 Vac breakdown
voltage, these switches will make and break
the following loads: 250 mꢁ at 28 Vdc,
inductive (2.8 henries); 1.25 amps at 28 Vdc
resistive;2.0ampsat115Vac,60Hzresistive,
for 10,000 cycles.
Stud Nuts, Mounting Nuts, Lock Washers:
Tin/zinc-plated or stainless steel.
Materials and Finishes
Military Qualified
Bases: ꢀiallyl per (MIL-M-14) ꢁSTM-ꢀ-5948
Cover,DeckSeparators,EndPlateandRotor
MountingPlate:ꢀiallylper(MIL-M-14)ꢁSTM-
ꢀ-5948
Extended Stud: Single shaft switches of six
or more decks and concentric shaft switches
of a combination of five or more decks
(Standardstyle)orfourormoredecks(Military
style) have longer studs with extra mounting
nuts for recommended double end mount.
Rotary
29
Grayhill, Inc.
•
561 Hillgrove Avenue
•
LaGrange, Illinois 60525-5997
•
USA
•
Phone: 708-354-1040
•
Fax: 708-354-2820
•
www.grayhill.com
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