Id like to mount this in a metal outlet box but how do i isolate the relay contacts on the back of relay from the metal outlet box?

First, it is good to hear that you are aware of the need. Yes, you can do it easily or more accurately. the easy way is to use 2 or 3 foam pads stacked on each other and attach to the back and then the metal box. This is a once and done method. The more service able way is to get some small 1" long bolts that will fit into the 4 holes on the corners, and bolt it to the metal box, using a piece of cardboard or stiff material to attach on the back and use 1/2" spacers or nuts to assure that the back of the PC board is above the metal back at least 3/8".

Can this relay be used with a Arduino Uno or Nano?

Not directly. This relay requires 12v to switch. Arduino only handles 5v. You can use a transistor but the simplest solution is to find a 5v version

Can you use relay be used to switch my dc power from my solar panels to ac to my water heater element

I believe it can. I used mine to start a sup pump in the basement in case water flooded the place. I wired to a sensor float and then to the pump. I have a 12 volt battery to provide the power for the switching.

says 30A @240, so can I put 15A @110v load on this ?

As the electrical theory goes: Watts = Amps x Volts Examples: 10 Amps x 120 Volts = 1200 Watts 5 Amps x 240 Volts = 1200 Watts So when you do math you will find that 65.4545~ Amps x 110 Volts = 7200 Watts. Which is the same amount of Watts when you do the math 30 Amps x 240 Volts = 7200 Watts. So 15A at 110 volts would be barely using the capacity of this relay. I hope this helps you.

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Yeeco 30A High Current 12V Contactor relay Switch Power Switch DC power Switching Control Board Control Module electrical relay switches for Cooler Heater Refit Water Heater Control

Product ID: 393552914

Details

Connector type
Through Hole
Contact material
Silver Alloy
Contact type
Normally Open
Current rating
30 Amps
Mounting type
DIN Rail Mount

⚡30A max current capacity

🔌12V DC coil voltage

🛠️4-terminal shunt design

Description

⚡ Switch to power, precision, and peace of mind — control your current like a pro!

BUILT TO LAST - Silver alloy contacts and IEC/EN 60947 certification guarantee durability and safety.
PRECISION CONTROL - Operates on a stable 12V DC coil voltage ensuring reliable switching every time.
COMPACT VERSATILE - Slim 0.7-inch profile with DIN rail mount fits seamlessly into professional setups.
POWERHOUSE PERFORMANCE - Handles up to 30A high current loads effortlessly for your heavy-duty devices.
SMART SPIKE PROTECTION - Integrated capacitor and diode protect sensitive electronics from voltage spikes.

The Yeeco 30A High Current 12V Contactor Relay Switch is a compact, DIN rail-mountable control module designed for high-load DC power switching. Featuring a 30A max current rating, silver alloy normally open contacts, and built-in spike protection, it’s ideal for controlling coolers, heaters, and water heaters with professional-grade reliability and efficiency.

Specifications

ASIN	B00MKWACVI
Brand Name	Yeeco
Coil Voltage	12 Volts
Connector Type	Through Hole
Contact Current Rating	30 Amps
Contact Material	Silver Alloy
Contact Type	Normally Open
Current Rating	30 Amps
Customer Reviews	4.5 4.5 out of 5 stars (206)
Item Weight	9 g
Manufacturer	Yeeco
Maximum Switching Current	30 Amps
Minimum Switching Voltage	12 Volts (DC)
Model	1300199
Mounting Type	DIN Rail Mount
Number of Items	1
Number of Packs	1
Operation Mode	Manual
Part Number	Y1300199
Specification Met	IEC/EN 60947
UPC	701203237612 070120323761
Unit Count	1.0 Count

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