Multi-Deck Rotary Switches
SPECIFICATIONS: Electrical Ratings, Others
Electrical Ratings
General
Electrical Ratings
Standard Style
Charts: Charts shown are for non-shorting
(breakbeforemake)contacts. Measurements
weremadeat25°Cand68%relativehumidity.
The load life curves show the number of
rotational cycles which can be expected for
the voltage, current and type of load. Thus,
for a standard style switch with a 300
milliampere 115 Vac resistive load, the
expected life is 15,000 cycles. Reducing the
load to 200 milliamperes increases the life to
25,000 cycles. Life limiting or failure criteria
are listed in the rating sections which follow.
Cycles: A cycle is a 360° rotation and a return
through all switch positions to the starting
position.
ContactResistance:50milliohmsmaximum
after life.
Curves are based on the following failure
criteria:
Contact Resistance: 50 milliohms maximum
(20 milliohms initially).
Insulation Resistance: 1,000 megohms
minimumbetweenterminalsandshaft. (50,000
megohms initially).
Voltage Breakdown: 500 Vac minimum
between mutually insulated parts.
Current Rating: These switches will carry 4
amperes with a maximum contact temperature
rise of 20°C. If the life limiting characteristics
are less critical than those shown above, if
elevated temperatures or reduced pressures
are involved, Grayhill can predict the switch
life for the application.
Insulation Resistance: 1,000 megohms
minimum between terminals and shaft.
Dielectric Strength: 500 Vac (atmospheric
pressure) and 350 Vac (reduced pressure)
between mutually insulated parts.
The Series 71 also meets the requirements
of MIL-DTL-3786/39 for moisture resistance,
stop strength, rotational torque, vibration (10
through 2,000 cps), medium and high shock,
salt spray, explosion, thermal shock (-65°C
to85°C)andterminalpull. Whentestedatsea
level, 25°C and 68% relative humidity with
failure criteria of 50 milliohms maximum
Voltage: As listed in charts.
Meet the Following Requirements of MIL- contact resistance and 500 Vac breakdown
DTL-3786: Moisture Resistance: Medium and voltage, these switches will make and break
High Shock; Vibration (10 to 2,000 cps); 250 milliamps at 28 Vdc inductive (250
Thermal Shock (-65°C to 85°C); Salt Spray, millihenries)500milliampsat28Vdcresistive:
Standard
600
500
400
300
200
100
VOLTAGE 115 VAC
OR 30 VDC
RESISTIVE
Explosion; and Stop Strength (10 in-lb).
500 milliamps at 115 volts Vac, 60 hertz
resistive, for 10,000 cycles of operation.
Electrical Ratings
Military Style
Curves are based on the following failure
criteria:
10
25
50
Additional Characteristics
Standard and Military Styles
Rotational Torque: 4-32 ounce-inches, (28-
CYCLES x 1000
VOLTAGE 30 VDC
INDUCTIVE
(250 MILLIHENRIES)
Qualified to the following MIL-DTL-3786/39 230 N•mm) depending on the number of
circuit values: (also see standard style poles per deck and the number of decks.
description.) The Series 71 has been tested to Contacts: Shorting or non-shorting wiping
meet the requirements of MIL-DTL-3786, Style contacts with over 100 grams of contact
SR39, the majority of which are listed here. At force.
85°C approximately 68% relative humidity and ShaftFlatOrientation:Oppositefirstposition
sea level pressure, the switches have been pole no. 1 (See Circuit Diagrams).
tested to make and break the following loads, Terminals: Switches are provided with full
as stated in MIL-DTL-3786/39: 125 circle of terminals regardless of the number
milliamperes at 28 Vdc resistive; 75 of active positions.
250
200
150
100
50
10
25
50
CYCLES x 1000
Military
VOLTAGE 115 VAC
OR 30 VDC
800
700
600
500
400
300
200
100
RESISTIVE
milliamperes at 115 Vac resistive.
Extended Studs: Switches of 6 or more
decks (or concentric switches of 4 or more)
The switches have also been tested at reduced have longer studs and extra stud nuts for
barometric pressure (70,000 feet), 25°C at recommended double end mounting. Stud
10
25
50
1
approximately 68% relative humidity to make hole size is /16" diameter for #0-80 NF-2A
CYCLES x 1000
and break the following loads as stated in MIL- thread.
DTL-3786/39:50milliamperes,28Vdcresistive; Stop Strength: 10 pound-inches.
VOLTAGE 30 VDC
INDUCTIVE
(250 MILLIHENRIES)
250
200
150
100
50
20 milliamperes, 115 Vac resistive. When
Mounting Bushing Strength: 10 pound-
tested to the above loads at stated conditions, inches.
the Series 71 switches meet the following life-
limiting criteria after 25,000 cycles of operation
in accordance with MIL-DTL-3786/39.
10
25
50
CYCLES x 1000
Rotary
11
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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