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Relays

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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 €2.58 Price €2.58

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 €2.58 Price €2.58

Semiconductor relay SSR-100A 480VAC / 100A - 32VDC

Solid-state single-phase SSR with 480 V AC and 32 V DC. The rated current is 100 A. The device generates no switching noise.
Index: AKS-10221
Index: AKS-10221
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Regular price €27.99 Price €27.99

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 €15.17 Price €15.17

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 €4.32 Price €4.32

DFRobot Gravity v2.0 - relay 1 channel - 277VAC / 16A contacts - 5V coil

Module with relay that allow for the control of the actuators through the ports of the microcontroller. The kit includes a cable adapted to DFRobot IO Expansion Shield.
Index: DFR-11262
Index: DFR-11262
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Regular price €12.13 Price €12.13

Grove - Solid State Relay - module with SSR 250VAC / 4A relay

Module from the Grove series with the SSR relay module with a control voltage of 3.3 V or 5 V and the maximum contact voltage of 250 V AC and 4 A. Thanks  to the application...
Index: SEE-11349
Index: SEE-11349
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Regular price €25.82 Price €25.82

Relay MPJ2-S-212-C - 12V coil, 2x 5A / 240VAC contacts

Coil voltage: 12 V, contacts: 5 A / 240 VAC. Dimensions: 29 x 12.6 mm, height: 20,6 mm.
Index: PRO-11597
Index: PRO-11597
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Regular price €1.69 Price €1.69

2 Channel Powered Relay Module 5V 1A/125VAC + 4GPIO - USB

The module has two relays HFD27/005-S with   a   coil  with a 5 V voltage. The circuit is operated directly from the USB connector. In addition, the module provides 4...
Index: MOD-08599
Index: MOD-08599
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Regular price €49.69 Price €49.69

Grove - 2-channels relay with optoisolation - 10A/250VAC - coil 5V + clear case

The module has two SRD-05 relays with the coil powered with the voltage of 5 V with optical insulation of input and mounting holes. The system allows you to control...
Index: SEE-12626
Index: SEE-12626
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Regular price €9.11 Price €9.11

Numato Lab - 16-channel relay module 24V 7A/240VAC + 10 GPIO - USB

The module features 16 relays with 24 V coil and 7 A / 240 V contact load. Additionally it has 10 GPIO pins , including 5 analog inputs with 10-bit resolution. GPIO pins...
Index: NUM-16027
Index: NUM-16027
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Regular price €162.53 Price €162.53

FeatherWing Non-Latching Mini Relay mini relay 250V/0.6 A - Shield for Feather - Adafruit 2895

The module from the Feather family is equipped with non-latching relay. It allows you to control actuators via the microcontroller. The maximum current is 2 A (at 40 V) and...
Index: ADA-06018
Index: ADA-06018
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Regular price €12.80 Price €12.80

Relay module 4 channels + Bluetooth 4.0 BLE - 10A / 250V contacts - 5V coil

The module has four SRD-05 relays with a coil powered with the voltage of 5 V, it was also equipped with a module Bluetooth 4.0 BLE allowing ot control the devices via Android...
Index: GRL-10909
Index: GRL-10909
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Regular price €43.18 Price €43.18

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 €4.32 Price €4.32

Semiconductor relay SSR-80A 480VAC / 80A - 32VDC

Solid state relay, single-phase SSR with the AC voltage of 480 V and constant of 32 V. Rated current is 80 A. The device does not create noise when switching.
Index: AKS-10220
Index: AKS-10220
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Regular price €23.87 Price €23.87

Relay MCB-S-212-C-S - coil 12V, contacts 2x 1A / 125VAC

Coil voltage: 12 VDC, contacts: 1 A / 125 VAC. Dimensions: 20,2 x 10 mm, height: 11.5 mm.
Index: PRO-11585
Index: PRO-11585
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Regular price €0.87 Price €0.87

Relay MPI-S-224-C-4 - 24V coil, 2x 8A / 250VAC contacts

Coil voltage: 24 V, contacts: 5 A / 250 V AC. Dimensions: 29 x 12.7 mm, height: 15.7 mm.
Index: PRO-11592
Index: PRO-11592
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Regular price €1.71 Price €1.71

Relay 8 channel module with optoisolation - 10A / 250VAC contacts - 5V coil - Modbus RS485 - Waveshare 17658

The module has 8 relays capable of switching 230 V AC or 30 V DC and a maximum current of 10 A . The relay coil is energized by 5 V. The module communicates via RS485...
Index: WSR-16406
Index: WSR-16406
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Regular price €37.98 Price €37.98

Grove - relay 1 channel - 30A-250VAC / 30VDC contacts - 5V coil

Module with relay that control the actuators consuming the current of up to 30 A for the voltage of 250 V AC, 30 V DC using the ports of the microcontroller. The module is...
Index: SEE-11351
Index: SEE-11351
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Regular price €12.80 Price €12.80

Tuya RTX WRS2 - 2x relay 100-240V AC WiFi

Ready-made two-channel  WiFi relay module. The device allows you to control two 100-240V AC devices with a maximum power consumption of 1150 W or two LED lighting sources...
Index: REM-16912
Index: REM-16912
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Regular price €19.94 Price €19.94

Inveo LanTick Pro PE-2-2 - IoT relay module

Inveo modules allow remote control of devices via Internet. It has 2 relay outputs of 250V and 2 binary inputs operating in counter mode. The module is controlled through the...
Index: INV-09117
Index: INV-09117
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Regular price €127.81 Price €127.81

Inveo Nano OUT - IoT module with relay

Inveo modules allow remote control of a device via the Internet. It has 1 relay output of 250 V and a built-in WEB server.
Index: INV-09120
Index: INV-09120
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Regular price €69.87 Price €69.87

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...
Index: MOD-06941
Index: MOD-06941
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Regular price €12.80 Price €12.80

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 €3.23 Price €3.23

What are the relays used for?

The primary function of the relays is usually to separate the control circuits from the power circuits for isolation purposes, e.g. to drive a high voltage or current from a lower control, and in some applications also to ensure operator safety. Relays were mainly used in very large quantities in electromechanical PSTN telephone switching systems; they are still used, but to a lesser extent as they have been replaced by electronics and computers. Relays can also be used to create suitable logic functions, as was the case with the first computers or in pinball machines. This is still the case in many signal boxes, designed before the 1990s. Relays were used in very large quantities in electromechanical PSTN telephone switching systems; they are still used, but to a lesser extent because they have been replaced by electronics and computers in today's switches. The service life of low-end electromagnetic relays is relatively short due to wear and tear on the contacts during repeated switching. However, there are solutions to extend the life of these relays. Some relays are designed and tested to withstand a minimum of 10 million operations.

Evolution of the electromechanical relays

The fully electronic, solid-state relays advantageously replace the electromechanical relays in many situations. Why is that so? Better switching speed, quiet operation, insensitivity to vibrations, are some of its advantages over electromechanics. On the other hand, it can poorly withstand high short-circuit currents, even though it is generally equipped with internal protection. It cannot be used either as a safety cut-off, because of the leakage current and the permanent short circuit that can be generated when the component flashes (unlike the electromechanical relay which sometimes "sticks" but, most often, opens when the current returns to zero). Several so-called "safety" relays are designed to offer a guarantee of opening in the event of a failure. For fixed railway applications (signaling) these relays must usually comply with certain standard which depend on the country. Most railway networks use relays of a very similar design. The search for alternative solutions using solid state relays has not been successful so far because the probabilities of the different failure modes are too close.

Which type of relay to choose?

The electromechanical relay, by its switching principle, is similar to a mechanical switch whose operation would not be manually, but from the power supply of a coil called excitation coil or control coil. The coil excitation field creates a magnetic field even when it is traversed by a weak current. It then causes the opening or closing of a switch connected in series in a circuit containing a motor or a lamp, consuming a high current. This is why it is called power adaptation because the relay can control a power greater than the excitation power. Most of the time, it will be associated with a transistor. On the other hand, a solid state relay has no moving parts. The transmission of information is carried out by infrared using photo-triac, phototransistor or photodiode associated with a control circuit. This absence of moving parts gives it a longer life and an absence of noise during use. If you have questions or concerns, please contact our technical department. The topic of relays may seem complicated, but we will be happy to share our experience with you and advise you on the best solution for your situation.