relay voltage rating

jarthel · 19th August 2006, 04:23 PM

I intend to buy a 10V relay. Can I use a varying DC supply of 9.5V to around 10.4V supply?

Thank you.

poobah · 19th August 2006, 04:27 PM

Yes... there is generally a little "give" in the coil specs. The absolute limits should be listed in the relay's data sheet though. You ARE talking about thew coil rating right?

jarthel · 19th August 2006, 05:13 PM

Quote:

Originally posted by poobah
Yes... there is generally a little "give" in the coil specs. The absolute limits should be listed in the relay's data sheet though. You ARE talking about thew coil rating right?

yes I'm talking about the coil.

unfortunately, I can't see the voltage operating range in the datasheet. all I see is the 10V (nominal).

thank you.

poobah · 19th August 2006, 05:21 PM

A 10 Volt relay would probably "pick up" at 6 Volts and "drop out" at around 4 Volts. So your safe at 9 Volts, easy, on the low side. Your limiter on the high side is power dissipation in the coil. You're safe to assume a +/- 10% on coil voltage.

jarthel · 20th August 2006, 01:25 PM

this is the relay I'm looking at: http://relays.tycoelectronics.com/datasheets/d2n.pdf

part no: V23105A5479A201

Thank you.

mrshow4u · 20th August 2006, 02:01 PM

it's a 10V 32.5mA 550mW 182 Ohm coil 3A contacts It doesn't give pull in or hold current specs. I think 9V would be easy.

rpapps · 20th August 2006, 02:06 PM

Hi Jarthel
From my reading of the datasheet, it looks like its good for from 6.3 to 13.4 volts.
Cheers
Rob

AndrewT · 20th August 2006, 02:21 PM

Hi,
it looks like the low operate voltage using 182r and 32.5mA is about 6V. Well below your 9.5V.

The release voltage is only quoted as the minimum, in other word,s the voltage below which you must reduce to guarantee release.
The maximum release is what some relays will start to drop out at. You will need to measure this for your relay.

jarthel · 21st August 2006, 01:31 AM

Quote:

Originally posted by AndrewT
Hi,
it looks like the low operate voltage using 182r and 32.5mA is about 6V. Well below your 9.5V.

where did you see this?

jarthel · 21st August 2006, 01:34 AM

also can I use this relay for 240VAC?

I saw in the datasheet something like

"maximum switching voltage: 250VAC"
"UL contact rating: 30V/1A or 100V/.3A"

Thanks again

19th August 2006, 04:23 PM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	relay voltage rating I intend to buy a 10V relay. Can I use a varying DC supply of 9.5V to around 10.4V supply? Thank you.

20th August 2006, 02:01 PM	#6
mrshow4u diyAudio Member Join Date: Jul 2006	it's a 10V 32.5mA 550mW 182 Ohm coil 3A contacts It doesn't give pull in or hold current specs. I think 9V would be easy. __________________ ".........These go to eleven"

20th August 2006, 02:21 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, it looks like the low operate voltage using 182r and 32.5mA is about 6V. Well below your 9.5V. The release voltage is only quoted as the minimum, in other word,s the voltage below which you must reduce to guarantee release. The maximum release is what some relays will start to drop out at. You will need to measure this for your relay. __________________ regards Andrew T.

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19th August 2006, 04:27 PM	#2
poobah diyAudio Member Join Date: Nov 2005	Yes... there is generally a little "give" in the coil specs. The absolute limits should be listed in the relay's data sheet though. You ARE talking about thew coil rating right?

19th August 2006, 05:21 PM	#4
poobah diyAudio Member Join Date: Nov 2005	A 10 Volt relay would probably "pick up" at 6 Volts and "drop out" at around 4 Volts. So your safe at 9 Volts, easy, on the low side. Your limiter on the high side is power dissipation in the coil. You're safe to assume a +/- 10% on coil voltage.

20th August 2006, 01:25 PM	#5
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	this is the relay I'm looking at: http://relays.tycoelectronics.com/datasheets/d2n.pdf part no: V23105A5479A201 Thank you.

20th August 2006, 02:06 PM	#7
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Hi Jarthel From my reading of the datasheet, it looks like its good for from 6.3 to 13.4 volts. Cheers Rob

21st August 2006, 01:34 AM	#10
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	also can I use this relay for 240VAC? I saw in the datasheet something like "maximum switching voltage: 250VAC" "UL contact rating: 30V/1A or 100V/.3A" Thanks again

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