Switch: jumper needed to achieve triple throw

[CarlyBoy]

I have several DP3T (ON-ON-ON) switches. Instructions indicate "jumper needed to achieve triple throw", but no drawing of this on the datasheet.
Can anyone explain or show me how this would be achieved?

 

[Markw4]

It depends on switch internal construction.

Can you post or link to the datasheet? A pic of the terminals might be helpful too, if that's not clearly shown on the datasheet.

In addition its possible you might need a DVM to verify actual switch operation.

EDIT: Possibly useful link: https://spemco.com/blog/single-pole...row-spst-dpdt-etc-how-to-tell-the-difference/

 

[CarlyBoy]

Thanks for the link summarizing types of switches, but it doesn't discuss jumpers. I've also tried to investigate it online to no avail.

Here is a picture of the switch:



Description includes "Jumper needed to achieve triple throw"..



Link to the datasheet (click on "datasheet"). Spoiler: it is unhelpful - the word "jumper" does not appear.

I have investigated the operation with the the continuity function of a DVM, but since i assume an additional piece of wire (jumper) is needed, this has also been fruitless.

 

[Mooly]

The data sheet I looked at says to look at the '6000' series for 3 pole models.

It talks of locking levers. Do you have to 'locate' the toggle in some groove or something to get a three way action?

 

[Markw4]

Except from datasheet attached below. 644H/2 has a center ON position rather than center OFF. Not sure what they mean by that.

With the switch in the center position, can you measure resistance between any sets of pins? If so, which pins are connected together in that case?

 

[Markw4]

Technical Information from Apem website attached below. Page 3 of the PDF shows 'Function 4.'

Note at the bottom of the page says:
"Terminals 2 and 6 must be connected by the user
for a 3 way switch. Single pole switches in a double pole case."

 

[steveu]

These are not 3 throw switches. They are two throw switches where the center "throw" activates one of the two poles. You can make it a single pole 3-throw by cascading the two poles, ie with a jumper. P1 -> A or P2, P2 -> B or C

https://th.bing.com/th/id/R.5c3b757769a1498c0f534a5b37f6054a?rik=iIDgQpPQaWiUBQ&riu=http://obrazki.elektroda.pl/3423067000_1401535986.jpg&ehk=ZeHWI2jJkxsFnSCz2cz5khxT2gO5T6OAutApxV9oeyM=&risl=&pid=ImgRaw&r=0

 

[CarlyBoy]

Apologies for confusion. I guess i can't take the wording for granted. Here is what in need..



So it would seem the switch must have four contacts on the back with the following designation: SP3T ON-ON-ON
Sound correct?

 

[Markw4]

Look at the diagram and information attached to post #6.

It shows that if pins 2 and 6 are tied together, the switch functions as SP3T with pins 2 & 6 acting as the common. The remaining terminals act as the throws (the output terminals, as it were, at least for the OP's particular application).

By the way, the above could have been deduced from resistance measurements at the switch terminals.

 

[CarlyBoy]

Yes! That's it! Thank you very much.

 

[gain wire]

I was going to post a new thread but I saw this one and thought it's about switches and switch circuitry.
I am looking for a rotary switch, more specifically wafer, that will keep the last selected position (contact) in circuit, while adding the next. I have only seen one Electroswitch datasheet that has this option. Those who know wafer switches will know that what I'm looking for is characterized by a contact disc that has a large diameter for the radius of action of the number of contacts. I don't
know how to explain it properly, but does anyone know which manufacturer makes a ten position single pole switch like this?

Thank you for all your help!

 

[Mooly]

I don't know of a specific example but what you want are called 'make before break' rather than 'break before make'.

Actually Lorlin were a common product. They do a 12 way 1 pole but Lorlin switches have an adjustable stop so you can make it anything up to 12 way:

https://lorlinelectronics.co.uk/product/ck

https://lorlinelectronics.co.uk/wp-content/uploads/2020/11/CK-ROTARY-Nov-2020-1.pdf

 

[Enzo]

Make before break are also sometimes called "shorting" switches.

 

[chrisng]

I am looking for a rotary switch, more specifically wafer, that will keep the last selected position (contact) in circuit, while adding the next.

Something like this?

CRL (Centralab, own by Electroswitch) make it.

https://www.electro-nc.com/crlcentralab-selector-guide

 

[gain wire]

Thanks Mooly and chrisng, I actually did find the electroswotch RD model described in their datasheet, but there seems to be no stock of it anywhere. Something tells me that it isn't a manufactured part yet, it's just listed as product they can manufacture, provided the client will buy a large enough quantity. Which I'm not looking for obviously.

I'm going to check out the Lorlin offering. Who knows...

 

[kodabmx]

I am looking for a rotary switch, more specifically wafer, that will keep the last selected position (contact) in circuit, while adding the next. I have only seen one Electroswitch datasheet that has this option. Those who know wafer switches will know that what I'm looking for is characterized by a contact disc that has a large diameter for the radius of action of the number of contacts.

These do what you want. I use them often.

https://www.aliexpress.com/item/32952341215.htm