Neptune Systems

I/O Breakout Box

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Advanced Monitoring & Control with the Breakout Box

  • Seamless Integration with Apex Controllers: Designed for the Apex Controller, enabling up to six external switches for enhanced monitoring and control.
  • Expand Your Monitoring Capabilities: Connect float switches, push buttons, leak detectors, and magnetic switches to monitor and automate your aquarium.
  • Versatile Usage for Every Need: The possibilities are endless, allowing for a highly customized setup
  • Plug-and-Play Convenience: Easy installation and compatibility with any open I/O port on an Apex Controller System ensures a hassle-free setup process.


Expand your aquarium's automation and monitoring capabilities with the Neptune Systems I/O Breakout Box, the ultimate accessory for your Apex Controller. This versatile device is compatible with any Apex Controller, allowing you to connect and manage up to six external switches for comprehensive control over your aquatic environment. 


What Can You Do With a Breakout Box?

The versatility of a Breakout Box lies in its ability to connect various open/closed devices, allowing for a wide range of custom automations and alerts that enhance the functionality of your Apex. Here are just a few of the useful things you can use a Breakout Box for:

Automate Water Level Management: Connect float switches for automated top-offs or water changes.

Enhance Safety with Leak Detection: Attach leak detectors to promptly alert you to water leaks, helping prevent damage to your home.

Monitor Environmental Conditions: Integrate humidity sensors for turning on/off fans or dehumidifiers.

Customize Feeding and Maintenance Schedules: Set up push buttons to initiate special feed modes, cleaning, or maintenance tasks.

Intrusion Detection: Implement magnetic switches on cabinets or covers for security, alerting you to unauthorized access by curious children or pets.



Note for Apex Jr. owners: A module, such as the PM1, with an I/O port is required for connection.

More Information
UPC 696859111150
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Product Questions

How long is the cable for this module that connects from the BOB to the Apex head unit?
Question by: Jacob Jackson on Jan 5, 2024, 1:00 PM
Hey there,
Thank you for reaching out to us. He is a link to get that question answered. http://support_at_neptunesystems.com/ Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Jan 31, 2024, 1:06 PM
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