Contactor: "Contact Switching Voltage"

[asavage]

https://www.te.com/usa-en/product-2138011-1.html

TE 2138011-1 Features

Why is the Contact Switching Voltage (MAX) = 24VDC, when the Rated Voltage is 900VDC ?

[tom91]

Automatically derived info, always check the data sheet. There are graphs showing you current rating of the contacts when switching resistive loads at 400V. Giving you a current vs expected cycle life.

https://www.te.com/commerce/DocumentDel ... F2138011-1

[asavage]

Hmmm. Could you dumb that down a bit for me?

I've read the datasheet top to bottom, and there's no mention of "contact switching voltage" nor switching 24v of either type. The contact performance (current vs lifecycle) graph for switching resistive loads doesn't on the face of it appear to have a relationship to a voltage (aside from 400VDC as a testing constant).

[Pete9008]

As Tom says, ignore the web site data and rely on the datasheet (it's not going to weigh 6.7g either!)

Web sites are prone to data base or manual entry errors (you're probably seeing erroneous copied data from another relay).

The data sheet is the thing that will have been fully reviewed/signed off by TE and is the best data source to use.

[asavage]

OK, errors in documentation are not unusual. On a different tack, I don't understand why there's a separate rating for "contact switching voltage" vs "rated voltage". What are the two different specs trying to tell me?

[later]

. . . (it's not going to weigh 6.7g either!)

I've just weighed one, and it's astonishingly close to 6.7 oz.

[Pete9008]

OK, errors in documentation are not unusual. On a different tack, I don't understand why there's a separate rating for "contact switching voltage" vs "rated voltage". What are the two different specs trying to tell me?

I think it'just the web site trying to cope with inconsistencies in naming terms between different datasheets. Having said that the datasheet itself isn't that helpful:
Rated operating voltage 450 to 600VDC (900VDC) 1)

1) Suitable for voltages up to 450VDC with limited capability to 900VDC. UL approved
model EVC 135-XXXXB required for 450 to 600VDC, limited capability to 900VDC.

So the datasheet information is valid up to 450V DC. You can also go up to 600V but will need a special UL approved model and you may be able to get to 900V but they are not going to tell you what other specs are derated! Assume there must be another data sheet somewhere detailing that?

Edit - except as Tom pointed out the graphs are for 400V operation!!

I've just weighed one, and it's astonishingly close to 6.7 oz.