Relay modules

By means of a relay, a circuit with much more power can be switched with a relatively small current.

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The 3 most popular Relay modules

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By means of a relay, a circuit with much more power can be switched with a relatively small current.

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BenOpencircuit Temperature controlled relay 12V - W1209 I first had a defective 12V adapter, which caused the relay, LED and display to flash "0F0". With a good 12V adapter the relay works fine.
Harry LeeverOpencircuit 5V relay with adjustable delay (0S - 10S) Works well exactly what I needed
AnoniemOpencircuit 5V Relay 10A Top product + received quickly = excellent webshop
Tim GOpencircuit Timer relay module - 12V I had a little trouble setting the correct mode, but once you get the hang of how the buttons work, it's pretty easy to operate.
DennisSparkFun Qwiic Single Relay Handy module for switching via microcontrollers. Easy to connect with the Qwiic system, without soldering. Works fine via I2C and is reliable under high load.
W. GrachtOpencircuit 5V Relay module 8 channels Works well, with 8 channels there are quite a few options to control devices. The optocouplers keep the signal safely isolated.
FloOpencircuit 24V Relay 10A Not tested. Packaging and delivery OK.
RobertOpencircuit 5V Relay 10A Excellent products, delivered quickly and good price.