Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois

60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com

Single Deck Rotary Switches

SPECIFICATIONS

Military Qualification

The dimensions for qualified switches are

the same as those indicated in the drawings

of standard switches. Switches with standard

variations, such as shaft and bushing length,

which do not affect switch performance, can be

marked as qualified product. Contact Grayhill

for complete information on variations.

36°, 45°, 60°, 90° (Series 50): The C and M

style switches are qualified to MIL‑S‑3786/20.

They include the following:

Solder lug or PC terminals

With or without panel seal

Series 50 qualified switches may be ordered

by the ‘M’ number or by the Grayhill part

number.

30° (Series 51): The C and M style switches

are qualified to MIL‑S‑3786/35. They include

the following:

Solder lug or PC terminals

With or without panel seal

Series 51 qualified switches may be ordered

by the ‘M’ number or by the Grayhill part

number.

Additional Characteristics

Contact Type and Forces: Shorting or non‑

shorting wiping contacts with over 80 grams

of contact force.

ShaftFlatOrientation:Flatoppositecontacting

position of pole number one (see circuit

diagrams).

Terminals: Switches have the full circle of

terminals, regardless of number of active

position.

Stop Strength: 7.5 pound‑inches minimum

Rotational Torque: 8–24 ounce‑inches,

depending on the number of poles.

SPECIFICATIONS: Other

PROCESS SEAlEd–Style T

Switch can be mounted on PC board with other

components and subjected to wave soldering

and conventional board cleaning techniques.No

secondary wiring or soldering is necessary.

Bushing is o‑ring sealed;epoxy potting seals the

terminals and the rear of the switch. Designed

for PC assembly, this sealing technique can also

be applied to solder lug terminal switches. A

bushing to panel seal can also be added to the

process sealed versions. Military qualified ver‑

sions are available, see ordering information.

Electrical Ratings

life Expectancy:With the limiting criteria stated

here, the Series 50 and 51 with non‑shorting

contacts will switch the following loads at

atmospheric and reduced pressures for 25,000

cycles of operations. One cycle is 360° rotation

clockwise and 360° return.

At 85°C, atmospheric pressure

200 mA,

28 Vdc resistive

150 mA,

115 Vac resistive

30 mA,

28 Vdc inductive

100 mA,

28 Vdc lamp load

75 mA,

220 Vac lamp load

At 25°C, reduced pressure (70,000 feet)

200 mA,

28 Vdc resistive

150 mA,

115 Vac resistive

75 mA,

220 Vac resistive

Contact Resistance: 20 milliohms maximum,

(10 milliohms initially).

Insulation Resistance: 1,000 Mohms

minimum between mutually insulated parts.

Voltage Breakdown: 600 Vac minimum

between mutually insulated parts at standard

atmospheric pressure.

life Expectancy: Listed for the voltage source

and make and break current levels. Contact

Grayhill for more information if any of the

following is true: the life limiting criteria are

more critical than those listed;longer operation

is required; a larger make and break current is

required; the operating environment includes

elevated temperatures or reduced pressures.

Contact Carry Rating: Switch will carry

6 amperes continuously with a maximum

contact temperature rise of 20°C.

Materials and Finishes

Switch Base: Thermoset

detent Rotor: Nylon

Shaft, Stop Blades, Stop Arm, Thrust washer,

and Retaining Ring: Stainless steel

detent Balls: Steel, nickel‑plated

Bushing: Zinc, tin‑zinc plated

Detent and Contact Springs: Stainless steel

Common Ring: Brass, gold‑plated over silver

plate.

Terminals: Brass, gold‑plated over silver plate

and nickel plate

Rotor Contact: Precious metal alloy, gold‑

plated

Panel Seal: Silicone rubber

Shaft Seal: Fluorosilicone

Mounting Nuts: Brass, tin‑zinc plated

Mounting Hardware: One mounting nut .089"

thick by .375" across flats and one internal tooth

lockwasher are supplied with the switch.

Maximum Mounting Torque: 15in‑lbs

1/4" SHAFT: Style K

POS. 1

CIRCLE SHOWING

DIMENSIONS OF

HOLE TO BE CUT

IN PANEL.

POS. 1

POS. 1

Ø0.254

Ø0.280

Ø0.380

0.208

0.240

0.350

1/8"Shaft

"E" Style

"K" Style

3/8-32 UNEF-2A

THREAD

.250

±.015

.375

±.015

+.001

-.002

.250

.250

±.015

.340

±.005

.219

±.004

Rotary

6

"K" Style

POS. 1

Ø0.380

0.350