Picker relays too good to be true?

[Jester]

I'm looking for an economical DPDT (or 2x SPDT) relay for polarity changing of a 90VDC motor rated at 750W

The relay will NOT be switched under load

These almost look too good to be true: price and specifications

https://www.digikey.ca/en/products/detail/picker-components/PC375-2C-12S4-X/12352856

Anyone use them?

[rob77]

probably you missed the 30V DC part in the datasheet..   but anyways.. you need something more beefy.

[Someone]

probably you missed the 30V DC part in the datasheet..   but anyways.. you need something more beefy.

But when not switched under load....  that rating isnt so important. They even explicitly have a separate rating for load/no-load conditions in that datasheet!

[rob77]

probably you missed the 30V DC part in the datasheet..   but anyways.. you need something more beefy.

But when not switched under load....  that rating isnt so important. They even explicitly have a separate rating for load/no-load conditions in that datasheet!

where exactly ?

https://pickercomponents.com/pdf/Relays/PC375.pdf

i see rating for normaly open and normaly closed contact versions.. and the double pole version is rated for 8A only which doesn't even fit the OP's requirement for 750W @ 90VDC which yields more than 8A.

[Jester]

probably you missed the 30V DC part in the datasheet..   but anyways.. you need something more beefy.

But when not switched under load....  that rating isnt so important. They even explicitly have a separate rating for load/no-load conditions in that datasheet!

where exactly ?

https://pickercomponents.com/pdf/Relays/PC375.pdf


i see rating for normaly open and normaly closed contact versions.. and the double pole version is rated for 8A only which doesn't even fit the OP's requirement for 750W @ 90VDC which yields more than 8A.

That's why I stated (or 2x SPDT) in my original post. The single form C is rated for 16A, so worst case it would be at about 50% of the contact rating, that is likely conservative enough.

[moffy]

They look like truck/car relays for 24v/12v systems, at least the DC versions. Their hold off voltage will be greater than your 90v because they can cope with 240v AC. Seems reasonable, nothing special, as long as they don't have to break current at 90v DC, but you have already stated that.

[free_electron]

i would go with the  30 ampere versions.

https://www.digikey.ca/en/products/detail/picker-components/PTRH-1C-15S-X/12697854
https://www.digikey.ca/en/products/detail/panasonic-electric-works/JTN1AS-PA-F-DC18V/648652

these are so called T90 type relays. many companies make those. there is a version with fast-on spades if you don;t want to run the high power on the board.
They are used comercially in many household ovens (5000 to 7000 watt) where they work without problems for decades.

Hongfa is a good chinese relay brand https://www.hongfa.com/


HF175 could do what you seek
https://www.hongfa.com/Product/Item/HF175F

on ebay 5 pieces for 17$ shipping included..

[Jester]

i would go with the  30 ampere versions.

https://www.digikey.ca/en/products/detail/picker-components/PTRH-1C-15S-X/12697854
https://www.digikey.ca/en/products/detail/panasonic-electric-works/JTN1AS-PA-F-DC18V/648652

these are so called T90 type relays. many companies make those. there is a version with fast-on spades if you don;t want to run the high power on the board.
They are used comercially in many household ovens (5000 to 7000 watt) where they work without problems for decades.

Hongfa is a good chinese relay brand https://www.hongfa.com/


HF175 could do what you seek
https://www.hongfa.com/Product/Item/HF175F

on ebay 5 pieces for 17$ shipping included..

WWCD........ I came to the same conclusion yesterday, while looking at the TE version. The faston terminals version save some cost and PCB space (less connectors).  I'm going to go this direction.  Thanks to everyone for their input.

WWCD = Winner Winner Chicken Dinner