Omega Products OSW3-10 User Manual

Rotary Selector Switches

For Thermocouple, RTD and
Thermistor Circuits

OSW Series

U 76 mm (3"), 127 mm (5")

and 1⁄4 DIN Sizes

U Gold or Silver Plated

Contacts

U 2 or 3 Poles in 76 mm (3")

and 127 mm (5") sizes

U 2, 3, or 4 Poles in

1

⁄4 DIN Size

U 2 to 34 Positions
U Round or Pistol Grip

Handles

U Wire Connecting

Combination
Screws Included

For isothermal, low resistance
switching of temperature
measurement circuits, OMEGA
offers three styles of selector
switches. The OSW style features
silver plated contacts, while the
OSWG line includes gold plated

Choice of GOLD or SILVER

Contacts Available

contacts. The SW14 1⁄4 DIN
switches come with a choice of
gold or silver-plated contacts. Each
style offers 2 to 34 positions in a
break-resistant Noryl® case.

The isothermal design of these
rotary switches minimizes
temperature gradients between
the input and output thermocouple
wiring. This in turn minimizes
errors in transmitting thermocouple
signals due to the generation of a
thermal emf at the wire junctions.
The low resistance of the silver or
gold plated contacts also enables
switching of temperature sensitive
resistance devices, such as RTD’s
and thermistors.

Two pole SW and OSW series
switches have a convenient
“off” position. The “off” position
may be left as an open circuit or
shorted to keep spurious signals
from registering on thermocouple
instruments. Each pole is fully
isolated. For quick and easy wiring,
the terminals located at the rear of
the switch are clearly marked.

MONOGRAM

with gold plated contacts

Any switch is available with a standard
round knob or an optional pistol grip
handle. Viewing the switch from a
distance is generally easier with a
pistol grip handle, as is switching its
position while wearing gloves.

®

SERIES

G-71

Standard Size
Rotary Selector
Switches for
Thermocouples
and RTD’s

3 Pole

E

A

B

D

U Gold or Silver Plated Contacts
U Standard Screw Termination

Insulation Resistance: 20 MΩ at 300 Vdc
Contact Resistance: 0.004 Ω or less
Also Available:

specify OSW-PG and switch size for additional cost

Pistol grip handle retrofit kit;

OSW Switch Dimensions

Switch Dim. Dim. Dim. Dim. Dim. Bezel
Size A B* C D E Size

mm mm mm mm mm mm mm
(inch) (inch) (inch) (inch) (inch) (inch) (inch)

76 28.6 54 62 44.4 66.7 82.55
(3) (1

127 38.1 54 62 58.7 92.07 133.35
(5) (1

To order with optional pistol grip, add suffix “‑PG” to
model number. Comes complete with mounting hardware,
panel mounting template and instruction manual for
additional cost.

Ordering Example: OSWG3‑20‑PG, 76 mm (3") switch,
20 positions, gold contacts, with optional pistol grip.

1

⁄8) (21⁄8) (27⁄16) (13⁄4) (25⁄8) (31⁄4)

1

⁄2) (21⁄8) (27⁄16) (25⁄16) (35⁄8) (51⁄4)

C

OSGW line has

Gold Plated Contacts

76 and 127 mm

(3 and 5") Sizes

To Order Visit omega.com/osw_sw14 for Pricing and Details

Silver Plated Gold Plated
No. of No. of Contact Contacts Contacts
Poles Positions Action Size Model No. Model No.

2 OSW3-2 OSWG3-2
3 OSW3-3 OSWG3-3

4
5 Before OSW3-5 OSWG3-5
6
8 OSW3-8 OSWG3-8

2

9 OSW3-9 OSWG3-9
10 OSW3-10 OSWG3-10

P

12 OSW3-12 OSWG3-12
14 OSW3-14 OSWG3-14

O

16 76
18 (3”) OSW3-18 OSWG3-18

L

20
24 Before OSW5-24 OSWG5-24

E

28
30

includes 32 (5”) OSW5-32 OSWG5-32

incl udes

“off” 36 OSW5-36 OSWG5-36

“off”

40 OSW5-40 OSWG5-40
6 OSWT-6 OSWGT-6
10 OSWT-10 OSWGT-10

3

12 OSWT-12 OSWGT-12
18 OSWT-18 OSWGT-18

P

20
24 Before (5”) OSWT-24 OSWGT-24

O

28
30 OSWT-30 OSWGT-30

L

32 OSWT-32 OSWGT-32

E

36 OSWT-36 OSWGT-36

no “off”

no “off” 40 OSWT-40 OSWGT-40

OSW3-4 OSWG3-4

Break

Break

Before

Make

Break

Before

Break

Make

Break

Before

Make

Break

76 mm

Make

Make

Make

(3")

OSW3-6 OSWG3-6

mm OSW3-16 OSWG3-16

76 mm

OSW3-20 OSWG3-20

(3")

127 mm

OSW5-28 OSWG5-28

(5")

127mm OSW5-30 OSWG5-30

127mm OSWT-20 OSWGT-20

127 mm

(5")

OSWT-28 OSWGT-28

G

G-72