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
1
⁄4 DIN Rotary Selector
Switches with “Jab-In”
Connections
U Fits Standard
U Gold or Silver Plated Contacts
U 2, 3, or 4 Poles
U 2 to 34 Positions
U Round or Pistol Grip Handles
U For Thermocouple, RTD or
Thermistor Circuits
OMEGA can supply pre-configured 483 mm (19") panels with
connectors, switch and meter installed for most any application.
Consult sales for details.
SW142-10-M
OMEGA is pleased to offer a
rotary selector switches in a 1⁄4 DIN
size. Like our other rotary selector
switches, this model is available with
Break Before Make and Make Before
Break contact action. Models are
available with 2 to 34 positions in
2, 3 or 4 pole versions. Available with
a standard round knob or optional
pistol-grip handle. The 1⁄4 DIN switch
also has “jab-in” style connections.
Jab-in Connections
1
on
⁄4 DIN Switch only
Easy to use jab-in
connections; no
loose hardware.
Dimensions
Bezel: 96 mm (3.78") sq, 1⁄4 DIN
Panel Depth:
2-pole: 63 mm (2
3-pole: 82 mm (3
4-pole: 101 mm (3
Panel Cutout: 92 mm (3
Face Height: 28 mm (1
67 mm (2
5
⁄8") with pistol grip
1
⁄4 DIN Cutout
13
⁄32")
5
⁄32")
29
⁄32")
5
⁄8") Dia.
3
⁄32");
To Order Visit omega.com /osw_sw14 for Pricing and Details
No. of No. of Silver-Plated Contacts Gold-Plated Contacts
Poles Positions Model No. Model No.
2 SW142-2-(*) SW142G-2-(*)
4 SW142-4-(*) SW142G-4-(*)
6 SW142-6-(*) SW142G-6-(*)
8 SW142-8-(*) SW142G-8-(*)
10 SW142-10-(*) SW142G-10-(*)
2 12 SW142-12-(*) SW142G-12-(*)
16 SW142-16-(*) SW142G-16-(*)
includes 18 SW142-18-(*) SW142G-18-(*)
“off” 20 SW142-20-(*) SW142G-20-(*)
position 24 SW142-24-(*) SW142G-24-(*)
30 SW142-30-(*) SW142G-30-(*)
34 SW142-34-(*) SW142G-34-(*)
2 SW143-2-(*) SW143G-2-(*)
4 SW143-4-(*) SW143G-4-(*)
6 SW143-6-(*) SW143G-6-(*)
8 SW143-8-(*) SW143G-8-(*)
10 SW143-10-(*) SW143G-10-(*)
3 12 SW143-12-(*) SW143G-12-(*)
16 SW143-16-(*) SW143G-16-(*)
NO 18 SW143-18-(*) SW143G-18-(*)
“off” 20 SW143-20-(*) SW143G-20-(*)
position 24 SW143-24-(*) SW143G-24-(*)
30 SW143-30-(*) SW143G-30-(*)
34 SW143-34-(*) SW143G-34-(*)
2 SW144-2-(*) SW144G-2-(*)
4 SW144-4-(*) SW144G-4-(*)
6 SW144-6-(*) SW144G-6-(*)
8 SW144-8-(*) SW144G-8-(*)
10 SW144-10-(*) SW144G-10-(*)
4 12 SW144-12-(*) SW144G-12-(*)
16 SW144-16-(*) SW144G-16-(*)
NO 18 SW144-18-(*) SW144G-18-(*)
“off” 20 SW144-20-(*) SW144G-20-(*)
position 24 SW144-24-(*) SW144G-24-(*)
30 SW144-30-(*) SW144G-30-(*)
34 SW144-34-(*) SW144G-34-(*)
Comes complete with mounting hardware, panel cutout template and instruction manual.
*Specify contact action: “B” = Break Before Make, “M” = Make Before Break.
To order with optional pistol grip handle add suffix “‑PG” to model number for additional cost.
To order a retro-fit kit for pistol grip handle specify: SW14‑ PG, for silver plated contacts,
SW14G‑ PG, for gold plated contacts.
Ordering Examples: SW142 ‑10 ‑ M‑P G, 2-pole, 10-position switch with Make Before Break
action, silver-plated contacts and optional pistol grip handle.
SW143G ‑14 ‑B, 3-pole, 14 position switch with Break Before Make action, gold-plated contacts.
Shown
actual size
1
⁄4 DIN Units
G-73
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