Which position is switch on and which position is off?

The contact is closed when the float is in the horizontal position. (It can be used for filling and emptying a container simply by mounting the switch so that it floats up or floats down.) I have used them to fill a water barrel in a greenhouse and to empty a sump in a basement. Two switches and a relay required in both cases for an auto fill or empty system.

If the tails are connected out of water is the rest of the switch fully submersible?

Yes, but they are intended to be fitted through a hole in the container side. Much the same as a float valve in a water storage tank. The moving part of the mechanism appears to be a magnet that moves closer to a reed switch encapsulated in plastic.

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3PCS Float Switch Side Mount Horizontal Liquid Float Switch Plastic Water Level Sensor Liquid Level Sensing Float Switch with 40cm Wire Cable for Fish Aquarium Tank Pool （Low Voltage 0~220V）

3PCS Float Switch Side Mount Horizontal Liquid Float Switch Plastic Water Level Sensor Liquid Level Sensing Float Switch with 40cm Wire Cable for Fish Aquarium Tank Pool （Low Voltage 0~220V）

Product ID: 459244793

Details

Brand
JUNMEIDO
Colour
Black
Compatible devices
[Various]
Power source
AC Powered
Voltage
220 Volts

⚡0~220V Low Voltage Range

📏40cm Wire Cable Length

🛠️Side Mount for Easy Installation

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€ 19.98

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of the flow with precision you can trust!

BUILT TO LAST - Durable, corrosion-resistant PP material stands up to diverse liquids and temperatures.
CUSTOMIZABLE CONTROL - Automatically adjustable for normally open or closed operation to fit your needs.
PLUG PLAY SIMPLICITY - Compact design with side mount and 40cm cable for effortless setup.
PRECISION AT EVERY DROP - High sensitivity ensures instant and reliable water level detection.
VERSATILE LIQUID LEVEL GUARDIAN - Perfect for aquariums, pools, hydroponics, and more—never miss a critical level again.

The JUNMEIDO 3PCS Float Switch set offers high-precision liquid level sensing with a durable, corrosion-resistant plastic build. Featuring a 40cm wire cable and side mount design, it supports low voltage operation (0~220V) and customizable switching modes, making it ideal for aquariums, pools, and hydroponic systems. Reliable, easy to install, and versatile—engineered for professionals who demand accuracy and durability.

Specifications

ASIN	B0B2HSSMH8
Best Sellers Rank	61,896 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 65 in Liquid Level Sensors
Brand	JUNMEIDO
Colour	Black
Compatible Devices	[Various]
Control Method	Touch
Customer Reviews	3.8 3.8 out of 5 stars (42)
Item Weight	0.08 Kilograms
Mounting Type	Side Mount
Power source	AC Powered
Sensor Technology	Contact Sensor
Size	Small
Smart Home Compatibility	Not Smart Home Compatible
UPC	749355706457
Unit Count	3.0 count
Voltage	220 Volts

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