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Protecting a relay or WiFi module (like this catalog's Shelly 1 Mini Gen3) when it will be installed outdoors, near a pump or an open-air irrigation panel.
Think of it as an umbrella with a lock for your relay: on the outside it's a hard plastic box closed with screws and a rubber gasket on the lid, and inside it has a mounting plate you can drill to screw in the relay or WiFi module. The seal keeps out rain, sprinkler overspray, and garden dust — exactly the most common reasons a cheap relay burns out or jams over time.
You install this catalog's Shelly 1 Mini Gen3 inside this box, screwed to the wall next to the patio's irrigation panel, so rain or the nearest sprinkler head can't hit the electrical contacts directly.
An irrigation installer who builds custom controllers with this catalog's ELEGOO 8-channel relay uses this box (or a bigger one from the same line) as a clean, protected final enclosure, instead of leaving the relay board exposed at an outdoor spigot or a shed with no door.
An $8-18 relay installed outdoors with no protection lasts only a few months before moisture corrodes the contacts and you need to buy a whole new one. This box costs nearly the same as the relay it protects, but saves you from replacing that relay every rainy season — over time, that's cheaper than buying the relay again and again.
LeMotech IP65 Weatherproof Enclosure — Project Box for Relays and WiFi Modules (255 x 200 x 80 mm)
$16.99reference price
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So you can use the right vocabulary with a customer, a supplier, or a manual.
A cheap entry point for controlling a single valve or pump from a microcontroller (Arduino, ESP32, Raspberry Pi). This particular model's listing doesn't confirm optocoupler isolation — before wiring it to a 24V AC load, verify that with the seller or add a separate optocoupler so you don't risk frying your microcontroller.
With 8 channels you can control up to 8 valves/zones from a single microcontroller — enough to build a complete DIY irrigation controller. It includes an optocoupler (real electrical isolation between the 5V logic and the switched load) and NO/NC terminals, making it safer than a 1-channel module without that isolation confirmed.
Unlike the relays in this ranking (1-channel and 8-channel), which are 'raw' modules meant to connect to an Arduino/ESP32, this one has its own built-in WiFi — you don't need to program anything or add a separate microcontroller, it's controlled directly from the eWeLink app (or Alexa/Google) as soon as you connect it to your network. 2 channels, dry-contact output compatible with 24V, up to 10A.
