Purpose of Relay in ATO

Tickyty · 07/30/2012, 10:37 AM

I recently installed an ATO to my sump

. I have seen various places where a relay has been used but I did not in my set up. I am using Digital Aquatics submersible switches with an Aqualifter pump. What is the benefit of installing a relay in this system. My power is on a GFCI circuit with a surge protector. I have yet to come across an explanation as to why the relay is needed or if it was just preferred.

SI_rEEfer · 07/30/2012, 11:51 AM

I believe they are used for Isolation, for example between 24V DC and 120V AC. This way a lower voltage circuit can be used for the switches that operate say a 120V AC pump.

Tickyty · 07/30/2012, 12:18 PM

Quote:

Originally Posted by SI_rEEfer

I believe they are used for Isolation, for example between 24V DC and 120V AC. This way a lower voltage circuit can be used for the switches that operate say a 120V AC pump.

Thanks for the reply. I will have to look into what what relay I will need to avoid burning up the switch I have in place. The switch can handle the current, rated for 0.5A and pump is 35mA. But the voltage of the pump (115V) is a little higher than the rated 100V on the switch.

Chris27 · 07/30/2012, 01:50 PM

In this case, the voltage rating on the switch isn't a concern, it's the current, you are far below the ratings and won't have any problems.

07/30/2012, 10:37 AM	#1
Tickyty Registered Member Join Date: Feb 2012 Location: Cedar Rapids IA Posts: 125	Purpose of Relay in ATO I recently installed an ATO to my sump . I have seen various places where a relay has been used but I did not in my set up. I am using Digital Aquatics submersible switches with an Aqualifter pump. What is the benefit of installing a relay in this system. My power is on a GFCI circuit with a surge protector. I have yet to come across an explanation as to why the relay is needed or if it was just preferred.

07/30/2012, 01:50 PM	#4
Chris27 Registered Member Join Date: Sep 2009 Location: Virginia Beach, VA Posts: 4,452	In this case, the voltage rating on the switch isn't a concern, it's the current, you are far below the ratings and won't have any problems. __________________ Fill your tank with $5 bills, add gasoline and light it on fire.....only then will you know the real cost of reefing. Current Tank Info: 180 Mixed Reef

07/30/2012, 11:51 AM	#2
SI_rEEfer Registered Member Join Date: Dec 2003 Location: North Aurora, IL Posts: 132	I believe they are used for Isolation, for example between 24V DC and 120V AC. This way a lower voltage circuit can be used for the switches that operate say a 120V AC pump.