Rotary Selector Switches

OSW, SW142, SW143 and SW144 Series

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•	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
•	Round or Pistol Grip Handles
•	Wire Connecting Screws Included
View related products - Thermocouple Connectors and Panel Systems

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.
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.

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.

No. of Poles	Contact Action	Size	No. 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
			3	OSW3-3	OSWG3-3
			4	OSW3-4	OSWG3-4
			5	OSW3-5	OSWG3-5
			6	OSW3-6	OSWG3-6
			8	OSW3-8	OSWG3-8
			9	OSW3-9	OSWG3-9
			10	OSW3-10	OSWG3-10
	Make Before Break	3"	12	OSW3-12	OSWG3-12
			14	OSW3-14	OSWG3-14
			16	OSW3-16	OSWG3-16
			18	OSW3-18	OSWG3-18
			20	OSW3-20	OSWG3-20
		5"	24	OSW5-24	OSWG5-24
			28	OSW5-28	OSWG5-28
			30	OSW5-30	OSWG5-30
			32	OSW5-32	OSWG5-32
			36	OSW5-36	OSWG5-36
			40	OSW5-40	OSWG5-40
3 Pole NO off	Make Before Break	5"	6	OSWT-6	OSWGT-6
			10	OSWT-10	OSWGT-10
			12	OSWT-12	OSWGT-12
			18	OSWT-18	OSWGT-18
			20	OSWT-20	OSWGT-20
			24	OSWT-24	OSWGT-24
			28	OSWT-28	OSWGT-28
			30	OSWT-30	OSWGT-30
			32	OSWT-32	OSWGT-32
			36	OSWT-36	OSWGT-36
			40	OSWT-40	OSWGT-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	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-(*)
	12	SW142-12-(*)	SW142G-12-(*)
	16	SW142-16-(*)	SW142G-16-(*)
	18	SW142-18-(*)	SW142G-18-(*)
	20	SW142-20-(*)	SW142G-20-(*)
	24	SW142-24-(*)	SW142G-24-(*)
	30	SW142-30-(*)	SW142G-30-(*)
	34	SW142-34-(*)	SW142G-34-(*)
3 NO off Positon	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-(*)
	12	SW143-12-(*)	SW143G-12-(*)
	16	SW143-16-(*)	SW143G-16-(*)
	18	SW143-18-(*)	SW143G-18-(*)
	20	SW143-20-(*)	SW143G-20-(*)
	24	SW143-24-(*)	SW143G-24-(*)
	30	SW143-30-(*)	SW143G-30-(*)
	34	SW143-34-(*)	SW143G-34-(*)
4 NO off Positon	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-(*)
	12	SW144-12-(*)	SW144G-12-(*)
	16	SW144-16-(*)	SW144G-16-(*)
	18	SW144-18-(*)	SW144G-18-(*)
	20	SW144-20-(*)	SW144G-20-(*)
	24	SW144-24-(*)	SW144G-24-(*)
	30	SW144-30-(*)	SW144G-30-(*)
	34	SW144-34-(*)	SW144G-34-(*)

* Specify contact action: "B" = Break Before Make, "M" = Make Before Break.

To Order (Specify Model Number)

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Part Number	Availability	Price	Description	Qty.

Example part numbers are shown in this table. See the Part Number Builder below to select any part number

SW142-2-B		$105.00	1/4 DIN, 2 pole, 2 position switch with make before break action and silver-plated contacts	qty.

SW142-20-B		$150.00	1/4 DIN, 2 pole, 20 position switch with make before break action and silver-plated contacts	qty.

SW143G-10-B	1 Week	$205.00	1/4 DIN, 3 pole, 10 position switch with break before make action and gold-plated contacts	qty.

SW144G-30-B		$343.00	1/4 DIN,4 pole,30 position switch with break before make action and gold-plated contacts	qty.

OSW3-3	1 Week	$97.00	3 inch, 2 pole, 3 positon switch with break before make action and silver-plated contacts	qty.

OSWG3-10	1 Week	$169.00	3 inch, 2 pole, 10 positon switch with break before make action and gold-plated contacts	qty.

OSWG5-40	1 Week	$277.00	5 inch, 2 pole, 40 positon switch with break before make action and gold-plated contacts	qty.

† All dollar amounts on this site are shown in US currency.

Part Number Builder

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Option Descriptions

(1)

Switch Style and Size

Select
SW142 for 1/4 DIN 2 pole silver-plated contacts
SW142G for 1/4 DIN 2 pole gold-plated contacts
SW143 for 1/4 DIN 3 pole silver-plated contacts
SW143G for 1/4 DIN 3 pole gold-plated contacts
SW144 for 1/4 DIN 4 pole silver-plated contacts
SW144G for 1/4 DIN 4 pole gold-plated contacts
OSW3 for 3in. size 2 pole silver-plated contacts
OSWG3 for 3in. size 2 pole gold-plated contacts
OSW5 for 5in. size 2 pole silver-plated contacts
OSWG5 for 5in. size 2 pole gold-plated contacts
OSWT for 5in. size 3 pole silver-plated contacts
OSWGT for 5in. size 3 pole gold-plated contacts

(2)

Number of Positions

Select
2 for 2 positions
3 for 3 positions
4 for 4 positions
5 for 5 positions
6 for 6 positions
8 for 8 positions
9 for 9 positions
10 for 10 positions
12 for 12 positions
14 for 14 positions
16 for 16 positions
18 for 18 positions
20 for 20 positions
24 for 24 positions
28 for 28 positions
30 for 30 positions
32 for 32 positions
34 for 34 positions
36 for 36 positions
40 for 40 positions

(3)

Contact Action(SW series only)

Select
Nothing(leave field blank) for OSW series
-B for break before make
-M for make before break

(4)

Grip Style

Select
Nothing(leave field blank) for Standard Grip
-PG for Pistol Grip

NOTE: All combinations may not be valid, check spec sheet for valid part numbers.