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IACS Float Kit 1 (FK1) Black Polypropylene Switch & 10A Relay Board


Datasheet & Instructions: IACS FK1 Datasheet

> View the video for this product here <

This is our most sought after float switch kit, consisting of a 10 amp float switch board and a black side-entry polypropylene switch that can be used in: water, salt water, weak acids and more. The kit allows you to switch larger loads than a float switch can do alone, it also protects any living creatures in the water such as fish, animals, or people from shock by only putting a tiny fraction of the power being supplied / switched through the float. The life expectancy of the switch is drastically increased and performance of your sump, tank or device is massively improved. We have other versions of this kit available and various diagrams too. CHECK OUT THE DATASHEET for more information that is ready to print or share, if on the other hand you want to see it in action. Check out our videos! You will need a power supply or battery to power the board with DC power, if you are switching a DC device you can usually get a board in around the same power input as the device you are controlling and simply share the PSU as the board requires very little to run. Alternatively, if you are wanting to switch AC power such as mains voltage, you will need either a transformer or a separate battery to run the board. Just to note a ’12 volt’ board running on 12V DC can control a 240V AC device, the power supply does not interact with the output, it merely switches it.



Product Details

For your convinience, please find datasheet we have put together containing information about size, specification, wiring, and safety information.

Datasheet & Instructions: IACS FK1 Datasheet

Product Features

Board Input Voltage OptionsWe are currently producing this product in voltage options: 9V DC, 12V DC, and 24V DC. You will need a power supply, transformer or battery if you wish to switch mains voltage.
Float Switch PowerThe float switch will have the same as the board’s input voltage or lower put through it but only at a low amperage of around 5-25mA making it much safer than running for example mains voltage that close to water.
Switching FormSPDT – NO, COM, NC
Switching Power (Amps)Up to 10 amps continuous (10A) at 250V AC, OR 30V DC

Some less common voltage variants such as 3V, 36V DC and 48V DC may have slightly lower ratings of around 7 amps or 28V DC instead of 10 amps and 30V DC; this is due to the manufacturing process and space inside the component’s casing. If this is a problem, check out our other items or contact us!

Switch Response Time (ms)Usually less than 20ms – most tests show around 8ms.
General FeaturesInput polarity protection, Flywheel, resistive logic, high quality, polarity LED and signal LED to indicate float state and power state. Only a very low voltage goes through the float switch – usually less than 5 volts DC. Mains voltage is always isolated from the float switch or sensor.
Compatible withSelf standing but may be interfaced with Arduino, ARM, AVR, MCU, PIC, Motherboard, optical controller, our USB / Serial 32 channel controllers, Raspberry Pi, 8051, TTL, CMOS, Parallel ports and more
Special FeaturesNo special features other than those listed in general features above.


Suggested UsesAlarm, lighting, security system, Arduino, Raspberry Pi, sensor switch, fan control, heating, general home automation, emergency pump, aquaponics, fish tank sump, flood prevention, automatic watering systems,

(L x W x H)

7cm + screw terminal overhangs board by around +5mm so (7.5cm) x 5cm x 2.6cm plus terminal block overhang approx 12mm clearance recommended
PCB TypeIndustrial Grade FR-4, does not flex or corrode
Surface TreatmentsLead-Free HASL (RoHS) or ‘ENIG’ for special batches, treated with a protective silicone based coating to resist / reduce moisture inhibition and/or corrosion
Place of ManufactureENGLAND (Hand assembled and quality tested on site)
Quality ControlCE, EMC, IEC 6100-6-1, 6100-6-3, RoHS, WEEE (Compliance Number WEE/FK 2902 UZ), IMS115
Safety NoticesTake care when working with high voltages, isolate before touching the unit, the board must be kept dry and should be mounted inside waterproof housing such as an IP rated enclosure with wires sealed.
VAT Invoices

(20%) Value Added Tax

UK VAT is already included in the sale price @ 20 %.We provide VAT invoices to our UK customers as standard (in the package)
QuantityThis listing is for 1 unit unless otherwise stated. The colours may vary depending on variant purchased. Photos are for illustrative purposes only.
Datasheet Locationhttps://iacselectronics.com/wp-content/uploads/2019/07/IACS-FK1-Datasheet.pdfhttps://iacselectronics.com/wp-content/uploads/2019/04/IACS-FK1-Datasheet.pdf
Manufacturer’s Websiteiacselectronics.com
CustomisationYes – We can customise kits and orders but a minimum order quantity or cover fee may apply.
Product ClassificationUsually dispatched within 72 hours depending on component availability and number purchased.

Additional information

DC Supply Voltage

5V DC, 6V DC, 9V DC, 12V DC, 18V DC, 24V DC, 36V DC, 48V DC

Float Switch Cable Length

Standard – As it comes (Approx 30cm), Extend to 1 Metre Approx, Extend to 2 Metres Approx


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