Modbus RTU 8-relay module with RS485 interface - Waveshare 17658

Module with 16 relays and 8 GPIO pins and 8 analog inputs. It communicates via the RS485, USB or Ethernet interface and supports the Modbus RTU/TCP protocol. Numato Lab NLRM1001-A

Module with relay up to 5.5 A and 240 V AC controlled by the I2C interface. SparkFun COM-15093

Module with 2 5 V relays with a maximum switching current of 2 A. It communicates via the USB interface and does not require an additional power supply. Numato Lab USBPOWRL001

Module with eight 240V/2A relays controlled by 5V with a fuse triggered by a low state. modSSR-8CH-L

Industrial module with Ethernet interface that allows control of 8 relays via RJ45 port and has 8 built-in digital inputs. It uses Modbus TCP protocol, PoE (Power over Ethernet) power supply and is equipped with a rail-mounted housing. Waveshare Modbus POE ETH Relay (B)

Programmable time module with relay, allows you to set the time and manner of relay reaction on the trigger signal, has a built-in LED display. It can be supplied with voltage from the range of 6 - 30VDC or using the microUSB connector

2-channel module with relays, designed to work with the Raspberry Pi. It can switch 250VAC/7A or 30VDC/10A signals. SB Components 14088

Module with 16 24 V relays with a load of up to 7 A. The board communicates via the Ethernet interface. Numato Lab 16ETHRL001-24

The module with 4 relays is designed to work with Arduino. It allows you to control devices with operating parameters up to 250VAC/7A or 30VDC/10A. Seeed Studio 103030009

AO3406 MOSFET transistor module with N channel and JST PH2.0 connector designed to control motor, solenoid or LEDs. Adafruit 5648

Module with 32 12 V relays with a maximum switching current of 7 A. It communicates via the USB interface. Numato Lab RL320001

Module with 24V relay and timer. It allows the implementation of delayed switching on or off of the circuit with adjustable time in the range from 1 s to 100 s and from 1 s to 15 min.

ModRL01 module with 10A/250VAC (10A/24VDC) relay, supply of 5 V load relay coil, additional control circuit, protected overvoltage control

Module with 8 relays 12 V with a maximum switching current of 7 A. Communicates via the USB interface. Numato Lab RL80001

Module with 8 digital inputs and 4 relays with a maximum switching current of 2 A. It communicates via the RS485 interface and supports the Modbus RTU protocol. The board is enclosed in an industrial housing. Wellpro WP8024ADAM

This SPST solid-state relay module allows for safe switching of DC circuits up to 60 V and 7 A, offering galvanic isolation and low conduction resistance (approx. 30 mΩ) thanks to the use of back-to-back MOSFET transistors. It features fast switching time (up to 1 ms), low control current consumption (approx. 10 mA), and the ability to control a signal from 2.7 to 40 V. Its compact design, lack of mechanical components, and the ability to mount on 2.54 mm connectors or screw terminals make the module a durable and quiet solution for systems requiring reliable isolation and long service life. Pololu 5420