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Relay modules

Products: 75
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Relay module 1 channel with optoisolation - 10A/250VAC contacts 5V coil

The module is equipped with relay SRD-05 with coil powered with a voltage of 5 V with optical isolation of input and mounting holes. The system allows you to control actuators...
Index: MOD-01997
Index: MOD-01997
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Regular price €1.78 Price €1.78

Relay 2 channel module with optoisolation - 10A/250VAC contacts - 5V coil

The module has two relays SRD-05 with a coil powered with a voltage of 5 V with optical isolation of input and mounting holes. The system allows you to control the actuators...
Index: MOD-02170
Index: MOD-02170
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Regular price €2.00 Price €2.00

Relay module 4 channels with optoisolation - 10A/250VAC contacts - 5V coil

The module is equipped with four relays JQC-3F with a coil powered with a voltage of 5 V with optical isolation of input and mounting holes. The system allows you to control...
Index: MOD-02579
Index: MOD-02579
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Regular price €3.13 Price €3.13

Relays module, 8 channels with opto-isolation - 10A/250VAC contacts - 5V coil - blue

The module has eight relays SRD-05 with coil powered with a voltage of 5 V along with optoelectronic isolation. The system allows you to control actuators with microcontroller...
Index: MOD-02966
Index: MOD-02966
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Regular price €4.95 Price €4.95

Relay 5V 10A/250VAC

The module is equipped with relay JQC-3FF-S-Z with coil powered with a voltage of 5 V. T he systems allows you to control actuators with microcontroller ports or with any...
Index: MOD-08463
Index: MOD-08463
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Regular price €1.78 Price €1.78

Relay module 2 channels - 10A/250VAC contacts - 5V coil

Dual module is equipped with  SRD-05 relays with the coil powered with the  voltage of 5 V , the transistor amplifier and mounting holes. The system allows you to control...
Index: MOD-02043
Index: MOD-02043
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Regular price €2.23 Price €2.23

Relay module 4 channels - 10A/250VAC contacts - 5V coil

Quadruple module is equipped with SRD-05 relay with a coil powered with the voltage of 5 V, the transistor amplifier and mounting holes. The system allows you to control...
Index: MOD-01998
Index: MOD-01998
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Regular price €3.31 Price €3.31

Relay module 2 channels H/L with optoisolation - contacts 10A/250VAC - coil 12V

The module has two SRD-05 relays with the coil powered with the voltage of 12 V with the optical insulation of the input and mounting holes. The system allows you to control...
Index: MOD-06552
Index: MOD-06552
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Regular price €2.18 Price €2.18

Relay module 2 channels H/L with optoisolation - 10A/250VAC contacts - 5V coil

The module has two SRD-05 relays with the coil powered with the voltage of 5 V with optical isolation of the input and mounting holes. The system allows you to control...
Index: MOD-06551
Index: MOD-06551
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Regular price €2.23 Price €2.23

16 channel relay module with optical insulation - contacts 10A/250VAC - coil 5V

The module has sixteen relays SRD-05 with a coil powered with a voltage of 5 V along with optoelectronic insulation. The system allows you to control the actuators with...
Index: MOD-06940
Index: MOD-06940
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Regular price €11.23 Price €11.23

Relay module semiconductor SSR 2A 1 channel - 240VAC / 2A contacts. 5VDC coil

The module is equipped with 1-channel relay, semiconductor SSR with a constant control voltage of 5 V DC and AC voltage switching between the values from 100 VAC to 240 VAC....
Index: DNG-10161
Index: DNG-10161
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Regular price €3.04 Price €3.04

16-channel relay module with optoisolation - 10A / 250VAC contacts - 12V coil

The module is equipped with sixteen SRD-12 relays with a 12-volt coil with optoelectronic isolation. The system allows you to control the actuators using the microcontroller...
Index: MOD-06941
Index: MOD-06941
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Regular price €13.28 Price €13.28

Iduino relay 2 channel module with optoisolation - 10A / 240VAC contacts - 5V coil

Module with two SRD-05 relays with the coil powered with a voltage of 5 V and optical insulation of the input, and with the mounting holes. The system allows...
Index: OST-14266
Index: OST-14266
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Regular price €2.59 Price €2.59

8 channel optoisolation relay module - 10A/250VAC contacts - 12V coil - red

The module has eight SRD-12 relays with a coil powered with the voltage of 12 V, with optoelectronic insulation. The system allows you to control the actuators using the...
Index: MOD-02699
Index: MOD-02699
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Regular price €8.98 Price €8.98

Grove - relay module v1.2

Relay module with Grove connector in 1.2 version. It allows you to control the executive elements by cutting off or supplying power. For proper operation it requires a 5 V...
Index: SEE-11347
Index: SEE-11347
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Regular price €1.91 Price €1.91

Module relay semiconductor SSR 2A4 channels - 240VAC / 2A contacts 5VDC coil - keyes

The module is equipped with a 4-channel, solid-state SSR relay with 5 VDC DC control voltage and switching AC voltage from 100 VAC to 240 VAC. Nominal current is 2 A. The unit...
Index: OST-15068
Index: OST-15068
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Regular price €10.96 Price €10.96

Semiconductor Relay moduleSSR 2 channels - 240VAC / 2A contacts 5VDC coil - keyes

The module is equipped with a 2-channel, solid-state SSR relay with 5 VDC DC control voltage and switching AC voltage from 100 VAC to 240 VAC. Nominal current is 2 A. The unit...
Index: OST-15067
Index: OST-15067
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Regular price €5.85 Price €5.85

DFRobot Gravity - relay 1 channel - 10A/277VAC contacts - 5V coil

Module with relay that allows for the control of the actuators consuming the current of up to 12 A for the voltage of 125 V or 10 A for 277 V through the ports of the...
Index: DFR-05964
Index: DFR-05964
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Regular price €2.59 Price €2.59

Relay module combined light-operated switch 12V 10A/250VAC

The module is equipped with SRD-12 relay with a coil powered with a voltage of 12 V with mounting holes. The system allows you to control the actuators depending on the...
Index: MOD-06253
Index: MOD-06253
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Regular price €3.58 Price €3.58

Sonoff Mini R2 - 240V WiFi relay - Android / iOS app

Ready-made 240 V relay module with small dimensions, so it can be mounted in a flush-mounted box. The device is controlled via a WiFi network using the eWeLink application...
Index: DNG-15925
Index: DNG-15925
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Regular price €10.10 Price €10.10

Semiconductor Relay moduleSSR 8 channels - 240VAC / 2A contacts 5VDC coil - keyes

The module is equipped with an 8-channel, solid-state SSR relay with 5 VDC DC control voltage and switching AC voltage from 100 VAC to 240 VAC. Nominal current is 2 A. The unit...
Index: OST-15066
Index: OST-15066
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Regular price €20.23 Price €20.23

Sonoff Basic R3 - relay 230V - WiFi Android / iOS switch

The next instalment of the popular Sonoff Basic relay. R3 version, in addition to its new design, has a DIY function for simple upload of your own software. The device has...
Index: ALT-16198
Index: ALT-16198
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Regular price €7.85 Price €7.85

Relay module Velleman 4 channels - 10A / 250VAC contacts - 5V coil

Quadruple module is equipped with SRD-05 relay with a coil powered with the voltage of 5 V, the transistor amplifier and mounting holes. The system allows you to control...
Index: VEL-13900
Index: VEL-13900
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Regular price €8.98 Price €8.98

Relay module 1 channel - 3A/250VAC contacts - 5V coil

The module is equipped with  HK4100F relay with the voltage of 5 V. T he system allows you to control the actuators with a voltage of 250 V AC / 30 V DC , using the ports...
Index: OST-14297
Index: OST-14297
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Regular price €1.73 Price €1.73

What is a relay and how does it work?

Relay modules offered in our store are electrical and electronic devices whose task, under certain conditions, is to suddenly change state in one or more output circuits. A relay responds to a change in an input physical quantity such as voltage, current, pressure or temperature in such a way that when it exceeds a certain level, the signal changes in steps, usually by means of "on" or "off" commands.

Applications for relays

Through their operation, relays allow a higher amplitude or voltage level to have an effect in circuits. There are overcurrent and undercurrent relays that respond to a change in the measured quantity above or below a certain level. An example is an overcurrent relay, which will trip when the current flowing through it exceeds a certain value. We offer relay modules ready to be implemented into the system or model being designed.

Optoisolation

Our relay modules are equipped with opto-isolation. What is optoisolation? It is nothing as complicated as it may seem. Optoisolation is separating individual circuits from each other by means of signal control. This is possible by using an optocoupler, which sends control signals in such a way as to electrically isolate these circuits. The process of optocoupling allows us to protect selected circuit elements - usually the most expensive ones in our system.

The difference between a contactor and a relay

What is the difference between these two systems, if the principle of their operation is the same? It lies in the systems in which they are used. Contactors are devices for switching high-current systems - for example, electric motors, and relays in low-current systems or signals with zero potential - for example, in the programming of logic controllers. This also results in a much longer life of relays than of contactors (several million connections on relays, to a few thousand on contactors).