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  5. Rotary Thermocouple Selector Switches

Rotary Thermocouple Selector Switches

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Rotary Thermocouple Selector Switches
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Data Sheet (PDF)

$320.14

Item# SW143-18-B

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $320.14
10-49 $294.53
50-99 $278.52
100-999 $262.51
1000-4999 $246.51
5000+ $230.50

In stock

Lead Time (If not in stock): 6 weeks
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Rotary Thermocouple Selector Switches SW143-18-B SW143-18-B
  • 3", 5" and 1/4 DIN Sizes
  • Gold or Silver Plated Contacts
  • 2 or 3 Poles in 76 mm (3") and 127 mm (5") sizes
  • 2, 3, or 4 Poles in 1/4 DIN Size
  • 2 to 34 Positions
  • Wire Connecting Screws Included

SW143-18-B Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Maximum Number of Positions
Switch Type
Contact Material
Contact Action
Form Factor


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 contacts. The SW14 1/4 DIN switches come with 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 RTDs 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.


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. The 1/4 DIN switch also has . jab-in. style connections.

No. of
Poles		Contact
Action		SizeNo. of
Positions		Silver-Plated
Contacts
Model No. 		Gold-Plated
Contacts
Model No.
2
Pole

includes off		 Break
Before
Make		 3' 2 OSW3-2 OSWG3-2
3OSW3-3OSWG3-3
4OSW3-4OSWG3-4
5OSW3-5OSWG3-5
6OSW3-6OSWG3-6
8OSW3-8OSWG3-8
9OSW3-9OSWG3-9
10OSW3-10OSWG3-10
Make
Before
Break		 3' 12OSW3-12OSWG3-12
14OSW3-14OSWG3-14
16OSW3-16OSWG3-16
18OSW3-18OSWG3-18
20OSW3-20OSWG3-20
5'24OSW5-24OSWG5-24
28OSW5-28OSWG5-28
30OSW5-30OSWG5-30
32OSW5-32OSWG5-32
36OSW5-36OSWG5-36
40OSW5-40OSWG5-40
3
Pole

NO off		 Make
Before
Break		 5' 6OSWT-6OSWGT-6
10OSWT-10OSWGT-10
12OSWT-12OSWGT-12
18OSWT-18OSWGT-18
20OSWT-20OSWGT-20
24OSWT-24OSWGT-24
28OSWT-28OSWGT-28
30OSWT-30OSWGT-30
32OSWT-32OSWGT-32
36OSWT-36OSWGT-36
40OSWT-40OSWGT-40
1/4 DIN Units
No. of
Poles		No. of
Positions		Silver-Plated Contacts
Model No. 		Gold-Plated Contacts
Model No.
2


includes
off Positon		2SW142-2-(*)SW142G-2-(*)
4SW142-4-(*)SW142G-4-(*)
6SW142-6-(*)SW142G-6-(*)
8SW142-8-(*)SW142G-8-(*)
10SW142-10-(*)SW142G-10-(*)
12SW142-12-(*)SW142G-12-(*)
16SW142-16-(*)SW142G-16-(*)
18SW142-18-(*)SW142G-18-(*)
20SW142-20-(*)SW142G-20-(*)
24SW142-24-(*)SW142G-24-(*)
30SW142-30-(*)SW142G-30-(*)
34SW142-34-(*)SW142G-34-(*)
3


NO
off Positon		2SW143-2-(*)SW143G-2-(*)
4SW143-4-(*)SW143G-4-(*)
6SW143-6-(*)SW143G-6-(*)
8SW143-8-(*)SW143G-8-(*)
10SW143-10-(*)SW143G-10-(*)
12SW143-12-(*)SW143G-12-(*)
16SW143-16-(*)SW143G-16-(*)
18SW143-18-(*)SW143G-18-(*)
20SW143-20-(*)SW143G-20-(*)
24SW143-24-(*)SW143G-24-(*)
30SW143-30-(*)SW143G-30-(*)
34SW143-34-(*)SW143G-34-(*)
4


NO
off Positon		2SW144-2-(*)SW144G-2-(*)
4SW144-4-(*)SW144G-4-(*)
6SW144-6-(*)SW144G-6-(*)
8SW144-8-(*)SW144G-8-(*)
10SW144-10-(*)SW144G-10-(*)
12SW144-12-(*)SW144G-12-(*)
16SW144-16-(*)SW144G-16-(*)
18SW144-18-(*)SW144G-18-(*)
20SW144-20-(*)SW144G-20-(*)
24SW144-24-(*)SW144G-24-(*)
30SW144-30-(*)SW144G-30-(*)
34SW144-34-(*)SW144G-34-(*)
* Specify contact action: 'B' = Break Before Make, 'M' = Make Before Break.
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Is the OSW3-12 waterproof?

Asked by: Dave74
Thank you for your inquiry Dave74. No, OSW3-12 is not waterproof.
Answered by: Application Engineer SP
Date published: 2022-08-03

I'm looking for a rotary selector switch to allow me to calibrate the input of a multi channel thermocouple recorder without interrupting the other signals going in, approx 30 inputs. I'm not clear if the switches listed will isolate 1 & pass thru rest

Asked by: Andrew awa
Best to call our engineering group to discuss.
Answered by: NJENG
Date published: 2021-07-15

Hi, Can you please advice the Environmental specification for the switch OSW-SW14, I mean what temperature and Vibration spec this part will meet.

Asked by: Vaishnavi
Hi Vaishnavi Thank you for the inquiry. Continuous use max temperature is 110 C. We do not advise use where vibration is present. We do not have a vibration rating on this product series. Best regards OMEGA
Answered by: NorwalkAE
Date published: 2020-06-07
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