Neptune Systems

I/O Breakout Box

In stock

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Add the I/O Breakout Box to your current aquarium controller an easy way to connect up to six external switch inputs. The breakout box is compatible with any Apex Controller.

  • Float Switches for sump alerts or ATO (Auto Top Off)
  • Push Buttons for special feed, cleaning, ect. modes
  • Leak Detectors
  • Magnetic switches on cabinets for intrusion detection


Customize your Neptune Apex Controller with the I/O Breakout Box. Add float switches, magnet switches, or any other open/closed device. The Breakout box does not power any accessories, but lets you monitor the signal of the switch connected to it, and then you can program your Apex controller to react to the change in the status. The breakout box can connect to any open I/O port on an Apex Controller System.


Besides the typical float switches, the options that you unlock with your Apex and a breakout box are virtually endless. Below are a short list of examples for possible switches and what they can accomplish. 

  • Float Switches for Auto Top Off
  • Reed Switches for incabinet lighting or intruder detection
  • Humidity Sensors for turning on and off fans or dehumidifyers
  • Momentary Swtiches for a time based function like saltwater mixing or water changes
  • 3-Way Toggle Switches for overriding programmed outlets
  • Leak Detection Switches for notifying you when a leak is occuring


What's Included?

  • 1x Neptune Systems Breakout Box
More Information
SKU 207510
UPC 696859111150
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Product Questions

Hello BRS!
Are there any guidelines on wire thickness vs. distance? Can any braded type wire (lamp wire, 18/2) be used?
Question by: JustinZ on Jan 29, 2018, 2:37 PM
The breakout box can use pretty thin wire. It is a very low voltage signal that is passed through and lamp cord should work, but maybe a little thick for the terminals. We have found some really thin speaker wire works really well for the breakout box.
Answer by: Charlie on Jan 29, 2018, 4:52 PM
What's the size of the box?
Question by: Jeremy on Jun 22, 2017, 8:31 AM
Hey Jeremy,
The breakout box measures: 3.8" x 2.1"
Answer by: Jason Smith on Jun 22, 2017, 11:08 AM
Hibiscus am interested in purchasing a Neptune slim leak detector and was wondering if this module is what I need to control that. My apex jr should be delivered any day now but I would love to add a leak detector asap. Thanks
Question by: Javin on May 24, 2017, 2:45 AM
For leak detection probes, you will need either the ALD module or FMM module. Each has its own probe options with different plugs depending on the module you use. If we can be of further assistance, please let us know!

Have a great day!
Answer by: Zack on May 30, 2017, 4:01 PM
Does this item work with the "New" Apex 2016 system?

Question by: Jeffrey Stevens on Nov 22, 2016, 7:40 AM
Great question! This is still compatible with the New Neptune Apex, and is necessary for incorporating various NO/NC switches. :-)
Answer by: Randy on Nov 22, 2016, 2:39 PM
How far away from the Break out box can probes be? Following the recommended wire-gauge, could the Break out box work with 20 feet of cabling? 50 feet? 100 feet? Have a ATO system in my garage about 20 feet directly away 50 worst case through the walls that I'd love to set up float switches to get emails about when I'm running low on RODI water, etc. I scoured Google and couldn't find anything. Would love to know if you guys know or could even possibly test it?!?!?! :-p
Question by: Kyle Rogers on May 14, 2016, 10:14 PM
Great question!
They can be used well over 50 feet from the source with thicker gauge wire. Neptune has informed us that some customers have taken an ethernet cable wires apart and used the wires to run well over 50'. Feel free to let us know if you have any further questions!
Answer by: Connor on May 19, 2016, 2:55 PM
What does this connect to? Will it connect to the energy bar or does it have to connect to the head unit?
Question by: dan on Jul 12, 2014, 6:31 AM
Hi Dan,
It depends on which apex unit you have. If you have a full apex system it will connect to the "I/O" port on the head unit. If you need to add more then one, or have an Apex Jr, then you would need to pick up a probe module 1 or probe module 2 which will give you additional I/O ports.
Answer by: Bulk Reef Supply on Jul 12, 2014, 6:31 AM
Will the reefkeeper float switch work with the neptune apex breakout box. from the pics it looks like the reefkeeper floats have no ends just bare wires. Thanks
Question by: AARON on Mar 29, 2014, 6:48 AM
Hey Aaron,
They sure will. The RK comes with two pieces of wire, one has a 2 pin plug on it and bare leads on the other, the other is the float switch with bare wires. When used with there equipment you connect the two together after the float switch is secured to the bracket. In your case you would just toss that pigtail with the 2 pin connector and use the float switch with the bare wires.
Answer by: Bulk Reef Supply on Mar 29, 2014, 6:48 AM
which apex controllers is this compatible with? jr? lite?

Question by: jonathan on Jan 4, 2014, 2:09 AM
Hi Jonathan,
The I/O breakout box is compatible with all versions of the Apex so long as you have an available I/O port. On the regular Apex this is a port that is built into the head unit, if you have a different version, or have used up the port, you may need to add an additional module to give yourself a free I/O port to plug the breakout box into.
Answer by: Bulk Reef Supply on Jan 4, 2014, 2:09 AM