Multi-Deck Rotary Switches
SPECIFICAꢁIONS:
Materials and Finishes
Standard Style
StyleꢀMꢀswitches,ꢀatꢀ85°C,ꢀapproximatelyꢀ68%ꢀ
humidityꢀandꢀseaꢀlevelꢀpressureꢀandꢀstyleꢀHꢀ
andꢀHSꢀatꢀ125°Cꢀhaveꢀbeenꢀtestedꢀtoꢀmakeꢀ
andꢀ breakꢀ theꢀ followingꢀ loadsꢀ asꢀ statedꢀ inꢀ
MIL-DTL-3786/SR04;ꢀ 250ꢀ milliamperesꢀ atꢀ
28ꢀVdcꢀresistive,ꢀ100ꢀmilliamperesꢀatꢀ28ꢀVdcꢀ
inductiveꢀ(2.8ꢀhenries);ꢀ75ꢀmilliamperesꢀatꢀ115ꢀ
Vacꢀresistive.
Bases:ꢀ Melamineꢀ perꢀ (MIL-M-14)ꢀ ASTM-D-
5948
Moꢀnting Bꢀshings: Brass,ꢀtin/zinc-plated.
Shaft, Cover Plate, Retaining Rings,
ꢁhroꢀghBolts,ShaftExtensions,StopArm,
Stop Washers, ꢁhrꢀst Washers and Rear
Sꢀpport Plate:ꢀStainlessꢀsteelꢀ
Detent Balls:ꢀSteel,ꢀnickel-plated
Detent Springs: Tinnedꢀmusicꢀwire
Rotor Contact: Silverꢀalloy
ꢁerminals,CommonPlateinclꢀdingSolder
Lꢀg:ꢀBrass,ꢀsilver-platedꢀ.0003"ꢀminimum
MoꢀntingHardware:Twoꢀmountingꢀnutsꢀ.094"ꢀ
thickꢀbyꢀ.562"ꢀacrossꢀflatsꢀandꢀoneꢀinternalꢀtoothꢀ
lockwasherꢀareꢀsuppliedꢀwithꢀeachꢀswitch.
Stꢀd Nꢀts, Moꢀnting Nꢀts, Lock Washers:ꢀ
Tin/zinc-platedꢀorꢀstainlessꢀsteel.
Cover,DeckSeparators,EndPlateandRotorꢀ
Moꢀnting Plate:ꢀ Phenolicꢀ perꢀ (MIL-M-14)ꢀ
ASTM-D-5948
Moꢀnting Bꢀshings:ꢀBrass,ꢀtin/zinc-plated.
Shaft,CoverPlate,RetainingRings,ꢁhroꢀgh
Bolts, Shaft Extensions, Stop Arm, ꢁhrꢀst
Washers Stop Washers and Rear Sꢀpport
Plate:ꢀStainlessꢀSteel
Detent Balls:ꢀSteel,ꢀnickel-plated
Detent Springs:ꢀTinnedꢀmusicꢀwire
Rotor Contact, Stator (Base) Contacts:
Silverꢀalloy
ꢁerminals (Except Common):ꢀ Brass,ꢀ tinꢀ
plated
Common Plate, Inclꢀding Solder Lꢀg: Brass,ꢀ
silver-platedꢀ.0003"ꢀminimum
Moꢀnting Hardware:ꢀTwoꢀmountingꢀnutsꢀ.094"ꢀ
(2,39)ꢀthickꢀbyꢀ.562"ꢀ(14,27)ꢀacrossꢀflatsꢀandꢀ
oneꢀinternalꢀtoothꢀlockwasherꢀareꢀsuppliedꢀwithꢀ
eachꢀswitch.
Theseꢀ switchesꢀ haveꢀ alsoꢀ beenꢀ testedꢀ atꢀ
reducedꢀ barometricꢀ pressureꢀ (70,000ꢀ feet),ꢀ
25°Cꢀatꢀapproximatelyꢀ68%ꢀrelativeꢀhumidityꢀtoꢀ
makeꢀandꢀbreakꢀtheꢀfollowingꢀloadsꢀasꢀstatedꢀ
inꢀ MIL-DTL-3786/SR04;ꢀ 200ꢀ milliamperes,ꢀ
28ꢀ Vdcꢀ resistive;ꢀ 25ꢀ milliamperes,ꢀ 28ꢀ Vdcꢀ
inductiveꢀ(2.8ꢀhenries);ꢀ20ꢀmilliamperes,ꢀ115ꢀ
Vacꢀresistive.ꢀWhenꢀtestedꢀtoꢀtheseꢀloadsꢀandꢀ
conditionsꢀ theꢀ styleꢀ M,ꢀ Hꢀ andꢀ HSꢀ switchesꢀ
meetꢀtheꢀfollowingꢀlifeꢀlimitingꢀorꢀfailureꢀcriteriaꢀ
afterꢀ25,000ꢀcyclesꢀinꢀaccordanceꢀwithꢀMIL-
S-3786.
Additional Characteristics
Standard Style and Military Qꢀalified
Contact: Shortingꢀ orꢀ non-shortingꢀ wipingꢀ
contactsꢀ withꢀ overꢀ 150ꢀ gramsꢀ ofꢀ contactꢀ
force
Rotational ꢁorqꢀe:ꢀ 8-115ꢀ ounce-inchesꢀ
dependingꢀuponꢀtheꢀnumberꢀofꢀpolesꢀperꢀdeck,ꢀ
numberꢀofꢀdecksꢀandꢀangleꢀofꢀthrow
MechanicalLifeExpectancy:100,000ꢀcyclesꢀ
ofꢀoperation
Shaft Flat Orientation: Flatꢀ oppositeꢀ
contactingꢀpositionꢀofꢀpoleꢀnumberꢀoneꢀ(Seeꢀ
circuitꢀdiagram).
Stop Strength:ForꢀStandardꢀstyle:ꢀ15ꢀpound-ꢀ
inchesꢀminimum.ꢀForꢀAdjustableꢀstopꢀstyles:ꢀ
12ꢀpound-inches
Contact Resistance: 50ꢀ milliohmsꢀ
maximum
Insꢀlation Resistance: 1,000ꢀ megaohmsꢀ
minimumꢀbetweenꢀterminalsꢀandꢀshafts
Dielectric Strength: 1,000ꢀVacꢀ(atmosphericꢀ
pressure)ꢀ andꢀ 450ꢀ Vacꢀ (reducedꢀ pressure)ꢀ
minimumꢀbetweenꢀmutuallyꢀinsulatedꢀparts.
Stꢀd Nꢀts, Moꢀnting Nꢀts, Lock Washers:ꢀ
Tin/zinc-platedꢀorꢀstainlessꢀsteel.
Materials and Finishes
Military Qꢀalified
Bases:ꢀDiallylꢀperꢀ(MIL-M-14)ꢀASTM-D-5948
Cover, Deck Separators, End Plate and
Rotor Moꢀnting Plate: Diallylꢀperꢀ(MIL-M-14)ꢀ
ASTM-D-5948
Whenꢀtestedꢀatꢀseaꢀlevelꢀ25°Cꢀandꢀ68%ꢀrelativeꢀ
humidityꢀwithꢀfailureꢀcriteriaꢀofꢀ50ꢀmilliohmsꢀ
max.ꢀandꢀ750ꢀVacꢀbreakdownꢀvoltage,ꢀtheseꢀ
switchesꢀ willꢀ makeꢀ andꢀ breakꢀ theꢀ followingꢀ
loads:ꢀ250ꢀmAꢀatꢀ28Vdc,ꢀinductiveꢀ(2.8ꢀhenries);ꢀ
1.25ꢀampsꢀatꢀ28ꢀVdcꢀresistive;ꢀ2.0ꢀampsꢀatꢀ115ꢀ
Vac,ꢀ60ꢀHzꢀresistive,ꢀforꢀ10,000ꢀcycles.
ExtendedStꢀd:Singleꢀshaftꢀswitchesꢀofꢀsixꢀorꢀ
moreꢀdecksꢀandꢀconcentricꢀshaftꢀswitchesꢀofꢀaꢀ
combinationꢀofꢀfiveꢀorꢀmoreꢀdecksꢀ(Standardꢀ
style)ꢀ orꢀ fourꢀ orꢀ moreꢀ decksꢀ (Militaryꢀ style)ꢀ
haveꢀlongerꢀstudsꢀwithꢀextraꢀmountingꢀnutsꢀforꢀ
recommendedꢀdoubleꢀendꢀmount.
Theseꢀ switchesꢀ alsoꢀ meetꢀ MIL-DTL-3786/
SR04ꢀ forꢀ moistureꢀ resistance,ꢀ mediumꢀ andꢀ
highꢀshock,ꢀvibrationꢀ(10ꢀtoꢀ2000ꢀcps),ꢀthermalꢀ
shockꢀ(-65°Cꢀtoꢀ125°C),ꢀsaltꢀspray,ꢀexplosionꢀ
andꢀterminalꢀpull.ꢀꢀꢀꢀꢀꢀꢀ
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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