Anyone know where I can find 48VDC Relay?

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DownRiverGUy

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Canton, MI
Hey guys,

So in a bit of a pickle.... designing a test stand connecting a bank of batteries to a hydrogen fuel cell.

We're testing the characteristics of charging/discharging this type of system with a resistance load.

Anyway... I'm trying to find a 48VDC relay that will allow us to switch the batteries out of the circuit if they are being over/under charged.

We have a Driver that will detect the voltage and activate/trip the relay.
http://www.morningstarcorp.com/en/support/library/RD.DAT.Datasheet.01.EN1.pdf

However it seems that 48VDC Relays are hard to come by....

This guy would be perfect but it seems like I'd have to wait months for them to ship one to me (no reps have them in stock)
http://www.omron.com/ecb/products/dry/3/g9ea-1.html

So really... the relay has to handle switching a circuit that can range from 0-80VDC and have current as high as 100A.
The Coil has to be 48VDC and can have a current as high as 750mA.

If you guys know of a particular application for a 48VDC relay and/or a place where they make keep stuff like this in stock It'd be greatly appreciated.

Let me know if I'm missing any parameters as well :-x
 
Square D has several type of relays available with 48 volt coils. the CA2SK series, for example.

Steve
 
DownRiverGUy said:
Hey guys,

So in a bit of a pickle.... designing a test stand connecting a bank of batteries to a hydrogen fuel cell.

We're testing the characteristics of charging/discharging this type of system with a resistance load.

Anyway... I'm trying to find a 48VDC relay that will allow us to switch the batteries out of the circuit if they are being over/under charged.

We have a Driver that will detect the voltage and activate/trip the relay.
http://www.morningstarcorp.com/en/support/library/RD.DAT.Datasheet.01.EN1.pdf

However it seems that 48VDC Relays are hard to come by....

This guy would be perfect but it seems like I'd have to wait months for them to ship one to me (no reps have them in stock)
http://www.omron.com/ecb/products/dry/3/g9ea-1.html

So really... the relay has to handle switching a circuit that can range from 0-80VDC and have current as high as 100A.
The Coil has to be 48VDC and can have a current as high as 750mA.

If you guys know of a particular application for a 48VDC relay and/or a place where they make keep stuff like this in stock It'd be greatly appreciated.

Let me know if I'm missing any parameters as well :-x
Click to expand...
In UK and normally just a few days delivery:
LC1-F115A-A65.
115 Amps AC3 (motor starting duty)
200A AC1 (resistive load)
List price ?111. About $200 but heavily discounted for OEMs.
CE, UL, and CSA approved.

Required coil 48Vdc:
LX4FFE
Price ?43.


Or try:

CURTIS INSTRUMENTS, INC.
200 Kisco Avenue
Mount Kisco
New York 10549,
U.S.A.
Tel: (1) 914 666 2971
Fax: (1) 914 666 2188
http://www.curtisinst.com
mailto: info@curtisinst.com

Agents for Albright contactors which specifically address the battery vehicle market.
 
DownRiverGUy said:
No listing will be needed for this application. This is for TESTING ONLY.

Hope this helps
Click to expand...
Well, you've been given a few leads.
Try them and, if they don't work out, ask again.
 
For what its worth, you are looking for a contactor. Relays are usually 10A although some of them go up to 20A.

Very few US devices have DC ratings, except for electric vehicle controllers. Almost all European/IEC equipment have published DC ratings even if they are not UL Listed ratings.
 
Last edited:
Siemens 3TC contactors if you are SWITCHING DC. http://www.sea.siemens.com/icc04/sec07/07-07.pdf
Just FYI, you need to use the term "contactor" in your searching if you want 100A capacity. "Relay" is a term usually associated with devices up to 20A max.

DC strikes a much longer arc than ac does, so DC contact ratings are different than AC contact ratings. That's why you will have a much more limited choice of devices that you can use.
 
You might try a telecommunications wholesale supplier, that industry uses a lot of 48 volt DC. I don't know if they would carry anything for that high of current, but it might be worth a try. Wired a cellular switching station building, and they used 48 Volts DC, even for the emergency lighting. Since they had a large room full of batteries, why not.
 
DC Cleaqring

DC Cleaqring

Warning, Will Robinson! Warning!

DC contactors need special designs because DC does not have a zero crossing to help extingush the arcing current. Permanent magnets are often included to force the arc to extend and blow out. Make sure that the contactor is rated for the proposed DC voltage and current. An AC-rated contactor should not be used.

48VDC coils can be had for most contactors. We use them all the time in the utility business.
 
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