Coles quality Open Frame Instrument Rotary Switch provides low
contact resistance (.005W), very high contact reliability, smooth
action with positive positioning, precision design, and trouble
free construction of glass epoxy insulators and silver conductors.
Rated for 100,000 cycles minimum, the contact mechanism is a
bifurcated brush, promising 100% redundancy and avoidance of
contact failure. In addition, it has been designed and manufactured
to meet or exceed all applicable requirements of MIL-S-3786,
MIL-T-945, QQ-P416, MIL-S-13282, MIL-STD-202, MIL-A-8625,
and MIL-STD-167. All Open Frame Series switches are available
pre-wired to terminal boards or connectors.
Coles Open Frame switches are ideal for high voltage, high current,
and low resistance applications.
OPEN FRAME SERIES
Open Frame Instrument Switches
ISO9001 CERTIFIED
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
Open Frame Series/Page 2
NOTES:
Open Frame - .250 Shaft Dia., 2.25 inch. square deck, (See Page 4).
Open Frame - .250 Shaft Dia., 2.75 inch. square deck, (See Page 3).
Open Frame
2.25 inch. square deck
(See Page 4)
Open Frame
2.75 inch. square deck
(See Page 3)
Very Low Electrical Resistance, Very Stable Electrical Contacts, 64 Positions Max
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
Open Frame Series/Page 3
Very Low Electrical Resistance, Very Stable Electrical Contacts, 64 Positions Max
Features
* Solid Silver and Silver Plated Conductors. * Bifurcated Brush Contacts for high reliability.
* Very Low Resistance (.005W). * 13+ Decks as Special Order.
* High Current Capacity. * Up to 12 Decks as Standard.
* User Adjustable Stop. * 8 Poles Maximum Available.
* Pre-Wired Option for Ease of Installation. * 64 Positions Maximum Available.
* Glass Epoxy as Strong Stable Insulator.
Contact Silver Detail
Rear View
Front View Side View
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
Terminal Board
Side View
Mounting Plate with Terminal Board - Front View
Front View Side View Rear View
ORDERING INFORMATION
Sample Code
Switch shown in the sample code is a 2-1/4 Square, 2 Poles
per Deck, Shorting, 11-1/4 Detent, 31 positions per Pole, 3
Decks, Adjustable Stop, Terminals to Rear.
OPTIONS
The following options can be added to the standard switch.
When ordering, simply add the letters after the basic part
number.
A = Adjustable stops.
D = Screwdriver slot.
F = Fixed stop between the rst and last position on a full-
turn switch.
G = RFI-EMI shielding.
L = Low Level.
P = Panel and shaft seals.
S = Shorting (Available in all Congurations).
Y = Optional .432 Non-Turn Washer.
Screw Terminals Available (Contact Factory for Special Part
Number).
Open Frame Series/Page 4
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
INSTRUMENT SERIES SWITCH SELECTION GUIDE - Positions Available for Maximum Rotation
NOTES: Series Size:
14=1-1/2” Square. 16=1-3/4” Square. NS=Non-Shorting.
22=2-1/4” Square. 26=2-3/4” Square. S=Shorting.
Open Frame Series/Page 5
• Position listed are maximum available, full rotation,
within conguration parameters.
• Non-Shorting contacts will be furnished unless other-
wise specied.
• Refer to series conguration specications for complete
details and proper identication.
• Larger deck sizes, detent spacing variation available for
special applications.
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
SIMULTANEOUS PARALLELING SWITCH
*Where it is required to have no open circulating between positions, including the independent
contact when the switch is rotated, use these SHORTING Basic I.D. numbers.
FUNCTION: The typical schematic left, is 24 positions, 15 degrees, 23 of the positions are
shorted together by 23 nger brushes connected in common to one collector ring. The 24th posi-
tion is contacted by an entirely separate nger brush which is connected to a separate collector
ring. As the switch is rotated, the separate brush makes contact with each switch position while
simultaneously all other
positions are shorted together. No second one pole deck is required to perform this function,
thus overall length is reduced and wiring time costs are reduced.
ONE PIECE FINGER BRUSHES: No mechanically or solder joined sections in the solid, stress-
free
one piece nger brush assembly. Solid ne silver nger brush contacts, stator contacts and col-
lector rings.
BINARY CODING OR POSITION SELECTION: Paralleling decks singly or in tandem are used
for binary coding or position selection allowing minimum amount of interconnecting circuit and
remote
control.
APPLICATION EXAMPLES:
1) Low voltage signal testing.
2) Multiple circuit cable testing, both continuity and voltage breakdown.
3) Current testing circuits to ground or common.
4) Solid state testing where it is desirable to connect all circuits to eliminate transients causing
erroneous test data.
5) One or more paralleling decks can be included in a standard multi-deck switch to meet all
types of requirements.
SIMULTANEOUS
PARALLELING
Open Frame Series/Page 6
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
PROGRESSIVELY PARALLELING (SHORTING) SWITCH
MAXIMUM ROTATION: 180 Degrees.
FUNCTION: The one piece nger brush assembly progressively connects (or shorts) together
the switch positions sequentially as the switch is rotated.
ONE PIECE FINGER BRUSHES: No mechanically or solder joined section in the solid, stress-
free one piece nger brush assembly. Solid ne silver nger brush contacts, stator contacts and
collector rings.
APPLICATION EXAMPLES: This type of switch is utilized for paralleling capacitors in capaci-
tance decade units, for varying capacity values in multiple xed frequency generators, receivers,
transmitters, etc. It is used in many resistance bridge, strain gage and transducer applications,
syncro systems, remote controlling, and computer systems. One or more progressively parallel-
ing decks can be included in a
standard multi-deck switch to meet all types of requirements, providing it does not rotate over
180 degrees.
NOTES
Current Rating: 1 1/2 amp with standard nger brush. Resistance: 0.005 ohms.
PROGRESSIVELY
PARALLELING
Open Frame Series/Page 7
OPEN FRAME SERIES
OPEN FRAME SERIES
Open Frame Instrument Switches
2650 South Croddy Way P.O. Box 25063 Santa Ana, California 92799-5063 USA
PHONE 714.556.3100 SALES FAX 714.241.9061 www.cole-switches.com
ISO9001 CERTIFIED
Specification Unit Value Note:
Military Specifications MIL-S-3786
Continuous (Non-Switching)
Current Carrying Capacity Amps 15 at 28 VDC, with max. contact temperature rise of 20ûC
Switching Current Capacity at
28 VDC resistive Amps 5
Switching Current Capacity at
115 VAC resistive Amps 5
Switching Current Capacity at
28 VDC inductive (2.8 H.) Amps 3
Switching Current Capacity at
28 VDC Lamp Load Amps 3
Low Level max. capacity mA 10 at 30 millivolts DC max.
Dielectric Strength, min. VRMS 1,500
Contact resistance, max.
(initial) milliohms (mΩ) 0.5
Contact resistance, max.
(after life) milliohms (mΩ) 20
Insulation resistance, min.
(initial) megaohms (MΩ) 100,000 at 100 VAC
Insulation resistance, min.
(after life) megaohms (MΩ) 50,000 at 100 VAC
Switching Life, min cycles 25,000 at rated loads, sea-level, 25ûC, 68% relative humidity
Mechanical Life, min cycles 100,000
Rotational Torque, min. inch pounds 24
Rotational Torque, max. inch pounds 80
Stop Strength, max. inch pounds 50
Mounting Ferrule Strength inch pounds N/A
Withstanding Shaft Push
Force pounds 200
Weight grams 140 2 inch. Square
Molded Parts Glass Epoxy-
Mil P 18177
Contact Surfaces Pure, Solid
Silver Gold plate is an option
Altitude feet 80,000 Typical pressure at 80,000 feet: 0.4 psi
Temperature, min. degrees Celsius -55
Temperature, max. degrees Celsius 125
Vibration Tested Meets Per MIL-S-3786, MIL-STD-202, Method 204, test condition
"B", vibration grade 3
Impact Shock, Medium Meets MIL-STD 202; Method 213
Impact Shock, High Meets at 100g, MIL-STD 202, Method 207
Moisture Resistant No
Salt Spray Resistant No
Explosion Proof No
Immersion No
EMI/RFI Meets MIL-S-3786, 2 ohms Shaft to ground max.
Capacitance, min picofarad (pF) 2-1/2 measured between contacts and between ring and contacts
Capacitance, max picofarad (pF) 4 measured between contacts and between ring and contacts
Open Frame Technical Data
at Atmospheric pressure with 85ûC and at reduced Barometric
pressure with 25ûC
Open Frame Series/Page 8