[ecdez]

I might be looking at the wrong one, not sure.

The voltage to turn the relay on will be 12 volt dc (max 50mA).

The load I'm trying to turn on is 120ac for a small coolant pump.

Am I looking at the wrong relay?

[joeavaerage]

Hi,

The voltage to turn the relay on will be 12 volt dc (max 50mA).

The load I'm trying to turn on is 120ac for a small coolant pump.

Then an SSR will be perfect, you don't need a contactor, the SSR does the job on its own. This is almost an identical purpose for which I bought
my SSR. I wanted to turn my coolant pump (240VAC) on and off, and my BoB signals 24V up to 50mA.

The SRR will work with any DC control voltage from 4VDC to 32VDC and under 20mA, so your 12V 50mA signal will be fine.
It can switch anywhere from 24VAC to 240VAC at up to 15A, so it will switch your coolant pump on and off no trouble.

So you don't need a contactor or a relay...just an SSR.

Craig

[maxspongebob]

Hi,



Then an SSR will be perfect, you don't need a contactor, the SSR does the job on its own. This is almost an identical purpose for which I bought
my SSR. I wanted to turn my coolant pump (240VAC) on and off, and my BoB signals 24V up to 50mA.

The SRR will work with any DC control voltage from 4VDC to 32VDC and under 20mA, so your 12V 50mA signal will be fine.
It can switch anywhere from 24VAC to 240VAC at up to 15A, so it will switch your coolant pump on and off no trouble.

So you don't need a contactor or a relay...just an SSR.

Craig

Joe has it right here.
However you must be careful about where you use a SSR. Many of them don't turn OFF completely. The cheap one's have a leakage current that will still provide a voltage at the output. This should not be a problem when running a motor for a pump, but in some situations it can cause a problem.

[joeavaerage]

Hi,

However you must be careful about where you use a SSR. Many of them don't turn OFF completely.

That is quite correct, the unit I linked to has a max leakage current of 7mA, so its not too bad.....but I'd never trust it to isolate the circuit if I were working on it....no way!

Craig

[mactec54]

Joe has it right here.
However you must be careful about where you use a SSR. Many of them don't turn OFF completely. The cheap one's have a leakage current that will still provide a voltage at the output. This should not be a problem when running a motor for a pump, but in some situations it can cause a problem.

This only happens if you buy the cheap Chinese SSR's, using quality brand name SSR's and this does not happen.

[mactec54]

I might be looking at the wrong one, not sure.

The voltage to turn the relay on will be 12 volt dc (max 50mA).

The load I'm trying to turn on is 120ac for a small coolant pump.

Am I looking at the wrong relay?

I thought you were switching a 12v Coil on a contactor, that's what your post read. if so then you need the SSR-DC Relay if you are switching direct to the pump then you would need an SSR-AC Relay

The Breakout Board side can be 3-32v DC you have 12v for that, so the contactor you are switching the coil you said was 12v

You can use the SSR and not have the contactor that then would be an Ac SSR to suit the coolant pump motor spec's.

[mactec54]

I might be looking at the wrong one, not sure.

The voltage to turn the relay on will be 12 volt dc (max 50mA).

The load I'm trying to turn on is 120ac for a small coolant pump.

Am I looking at the wrong relay?

Whatever SSR you get, one feature it will need for switching a motor load is (Zero Crossing) look for this in the spec's, nobody has mentioned this in their posts.

You can also switch the SSR direct from the Breakout Boards 5v signal, don't need to add in the 12v