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Standard Generic Float Switch

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Standard Generic Float Switch

75% Recommend this to a friend (3 of 4)

SKU: 300100
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Quick Overview

Recommended for water applications like level controllers, auto top systems or other aquarium uses.

  • Normally closed or normally open (see more)

  • Float magnet is encased inside the float

  • 48" leads (22 gauge wire) offer project flexibility

M8 fitting – includes a nut and sealing O-ring


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Previously Asked Questions

  • by Steve on April 5, 2014, @2:43 AM

    How does this switch mount to an aquarium tank?

    Bulk Reef Supply Hi Steve,
    This is just the switch itself, generally as a replacement part or a DIY component. It has a threaded shaft and a nut to secure the float switch, generally to an L shaped bracket of some sort but it really depends on what your going to use the float switch for.

    Do you find this question helpful?  Yes   No

  • by CM on May 4, 2014, @6:36 AM

    Will this switch work with the apex breakout box?

    Bulk Reef Supply It sure would!

    Do you find this question helpful?  Yes   No

Full Details

Standard Generic Float Switch is great for:


  • General water level control applications
  • Aquarium top-off applications
  • Humidification/de-humidification applications
  • Hydroponics projects
  • Water features
  • Air conditioning drain pan applications

Don’t use in heavy duty applications like sewage pumps.

Great for water. Check your fluid's specific gravity.

The wires complete a circuit when the float is down. You can reverse the operation by removing the clip, turning the float upside down and replacing the clip.

A pump rated at just 5 watts can destroy a float switch rated for 50 watts, locking it in the “on” position and pumping a lot of water where you do not want it.

The magnetic reeds enclosed in liquid level sensors are extremely reliable and long-lasting when utilized properly. Failures are nearly always a result of current overloading. Pumps, solenoids and many other devices that require control by a liquid level sensor carry "steady state" current ratings. These devices can draw ten times (or more) their steady state power ratings on start-up or shut-down. When the reeds inside our switches are exposed to this kind of "spiking voltage" they can overheat and become deformed. In some cases they may even weld together or break off, causing the switch circuit to remain closed (or open) regardless of the level of the float. Deformed reeds can also function intermittently, causing problems with troubleshooting. A 50 watt float switch can be destroyed by a pump rated at 6 watts and, unfortunately, it may take many cycles before the failure occurs.

Because they can destroy an otherwise very reliable float switch, care must be taken to completely isolate the switch from the current drawn by pumps, solenoids or other devices subject to spiking voltage. Resistors or diodes may be used, but the most common solution is to utilize a circuit board or a relay.

In the illustration, a relay acts as a switch for a pump, thereby isolating the float switch from any spikes that the pump may draw. The float switch turns the relay coil on and off. In this way, the only current handled by the float switch is that small amount required by the relay coil. Please consult with your relay supplier to assure that the relay current requirements are well within the specs of the float switch.



4 Items

  • Good for the money By Ron c on 3/10/2015

    Item as described. Better than other switches because it has a 4 foot cord which makes it very easy to wire up to your breakout box.
  • Switches shorted out after only 5 months. By Teddy on 9/30/2014

    They worked like a charm and had no issues with them until I noticed my Ph probe was acting funny. I have had 2 of these float switches running my ATO for the last 5 months and worked without a hitch. I then started to wonder what was going on with my PH probe as it was reading values of less then 4. After calibrating and pulling things out of my sump and trying to figure out the problem I came to the conclusion that both the float switches were shorting out in my sump. Once both float switches were pulled out of the sump my Ph probe's readings shot up to 8.1. All in all I am now back to manual top offs daily until I can find a more reliable float switch.
  • Float Switch By Brandon on 2/22/2013

    The float switch that i just purchased is awesome! I feel great now, knowing that i can leave and my tank will always be full!
  • Great little float switch By Harry on 2/26/2011

    This is a very nice float switch with nice long leads on it.
    The float itself is smooth plastic so it is easy to clean.
    Very nice price for a good float switch.

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