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Neptune Systems I/O Break Out Box for Apex, Apex Lite, AquaController 3, or AquaController 3 Pro


Item #: NS5413

In Stock

Neptune Systems I/O Breakout Box

When connected to the I/O Port of your Apex, Apex EL, ASM or PMx module, the Breakout Box gives you an easy way to connect up to six external switch inputs to your Apex.

You can easily add float switches, water on the floor sensors, etc. to the Apex WiFi, Apex EL, Apex Lite, Apex Jr (either PM1 or PM2 module also required), AquaController 3, or AquaController 3 Pro. Simply plug the Breakout box`s mini din 8 cable into the AquaController I/O port, and then attach the float switch, or water on the float switch wires to the quick connector terminals. No soldering or special tools required.

  • 5` Cable plugs into the I/O Connector of the controller.
  • Supports 2 Digital inputs on the AC3.
  • Supports 4 Digital inputs on the AC3Pro.
  • Supports 6 Digital inputs on the PX 1000, Apex, and Apex Lite.
  • Quick Connect Terminals - no soldering required. Recommended for use with 18 to 24 gauge stranded wire.
  • 2 Mounting Holes for easy installation.

Examples of things you might connect in this manner include:

  •     Float Switches for sump alerts or ATO (Auto Top-Off) 
  •     Push Buttons for special modes (Feed, Cleaning, etc.)
  •     Magnetic switches on cabinets for intrusion detection
  •     Many other creative uses

Manufacturer information

Neptune Systems Aquarium Supplies
Neptune Systems is one of the world’s leading manufacturers of aquarium controllers. The company was founded in 1995 for the purpose of developing affordable water quality monitoring and control instrumentation. Their engineering team has extensive expertise in computer hardware and software system design as well as a background in water quality analysis. Neptune Systems uses these finely-honed engineering skills to develop innovative monitoring and control solutions for use in reef and fresh water aquariums, aquaculture tanks, hydroponics systems and general laboratory use. Neptune Systems is best known for their AquaController line. The company is known for their innovation and customer centricity.

5 Stars


Reviewed on
March 27, 2019

Yes, I would recommend this.

Great product

Pros: Authentic Neptune Apex product

Cons: May be hard if you run inputs off of it to wire them all to one screw.

I thought about picking up the avast version or making a diy but ultimately I wanted the piece of mind that it was a Neptune Apex product with the quality and support that comes with it. I have three devices run off of it and have had no issues with using multiple wires on the ground terminal. If you plan on using all six you may want to splice a single wire from the ground to a wire nut or solder them together. For my use with three I just hooked them to the ground directly.

Was this review helpful? 1 0


Reviewed on
April 14, 2017

Yes, I would recommend this.


I use the BOB for cutting lights on when opening the cabinet doors, also use for my ato. I love the break out box.

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curtis howard

Reviewed on
February 13, 2016

Yes, I would recommend this.

Neptune I/O Break Out Box

I have had the Neptune Apex for several years without the I/O Break Out Box and didn't know what other possibilities were out their waiting for me. I needed a float over flow switch for a auto top off system I just installed and this purchase fall right into place. I'll be doing a few other improvements because of the break out box. It's easy to install and once plugged into the apex system it's ready to program.

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william valliere

Reviewed on
November 06, 2014

Yes, I would recommend this.

Neptune Breakout Box

Works great, easy setup.

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robin ashby

Reviewed on
September 19, 2014

Yes, I would recommend this.

Great for adding switches

I used one of these to connect float switches to my Apex and now I have automated my freshwater production as well as top offs for 2 tanks. It has definitely been worth it. To make everything work I also bought an electric solenoid valve for the RODI top off, 2 aqua lifter pumps for the tank top offs and float switches for level monitoring.

Was this review helpful? 1 0

piotr kulesza

Reviewed on
April 26, 2013

Yes, I would recommend this.

Fantastic system

This product is great, I used the digital aquatics float switches with this and it works great for auto-top off. As for water on the floor sensors I have heard that the fridge leak detection ones work well without the need to buy the separate module,I have yet to use it for this function though and can only attest to the float switch use as an ATO.

Was this review helpful? 1 0

scott woods

Reviewed on
November 13, 2012

Yes, I would recommend this.


The tinny screws to connect the switches to are really small. But it works. Just had a sump over flow and got the alarms and text messages and e-mail on my phone telling me so just last night.

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socratic monologue

Reviewed on
March 04, 2012

Yes, I would recommend this.


Seems well built, and works fine so far. Wire clamps seem to hold firmly, and are not as difficult to use as I had heard (the little calibration screwdriver that comes with pH meters and refractometers is the right size for the screws on the BOB). Seems like $40 is a bit much for such a simple device, but if it works well I suppose it is worth it.

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Reviewed on
January 11, 2012

Yes, I would recommend this.

Analog control

Simple unit to control ATOP, Leak sensor and other on/off switch applications for the tank.

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german gaytan

Reviewed on
December 19, 2010

Yes, I would recommend this.


Easy to use. In the newer version you screw on the wires, and not clip them on like the picture above. Did not come with instructions, there in the APEX Manual. When plugged to the APEX, you will not see the switches, just use SwitchX in your code: Ex. If Switch(1-6) OPEN/CLOSED Then ON/OFF

Was this review helpful? 4 0

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