A relay is an electrical device that distributes power based on an order issued by the control part. In this way, a relay allows the opening and closing of an electrical power circuit based on logical information. The primary function of relays is most often 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. Although it may sound complicated, it is one of the principles of eclectic networks and can help us understand how electronic gadgets work on connectivity. In this section of the Botland store you can find many relays that will help you to explore the secrets of this learning and help you gain the right skills. If you have any questions or concerns, do not hesitate to contact our technical department. We are happy to share our knowledge and experience.
- On sale!
- Promotion
DFRobot qualMeter Basic - power supply/charger and USB cable tester
Index: DFR-10166
- Reduced price
- Promotion
Pibow Coupé 4 – Rainbow - Case for Raspberry Pi 4B - Pimoroni PIM465
Index: PIM-14881
- On sale!
- Promotion
Loading...
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
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
Tinycontrol GSMKON-010 - relay board 4x16A/coil 12V for GSM/LAN controller
The module is equipped with 4 Relpol relay a coil supplied with a voltage of 12V, with optical isolation input and mounting holes. The system is designed to work with GSM and...
Index: TNC-08291
Index: TNC-08291
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
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
Numato Lab - 8-channel relay module 12V 10A/250VAC + 10GPIO - Ethernet
The module has eight HF3FF 012-1ZST relay with a coil supplied with voltage of 12 V. The system is controlled via Web interface or TELNET. In addition, the module has 10 GPIO...
Index: MOD-11659
Index: MOD-11659
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
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
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
Relay Hat for Raspberry Pi - 2 relays 240V/10A
Shield for Raspberry Pi 2, with two relay RM50-3011 with settings of 240 V / 10 A. Board has a screw connection, as well as a place to prototype systems. It communicates...
Index: MSX-04555
Index: MSX-04555
- On sale!
- Promotion
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
Solid state relay SSR Fotek 10DA - 10A 380VAC / 32VDC
Solid state relay is used for contactless switching of the devices of high power. It is characterized by rapid time switching and quiet operation.
Index: DLT-14498
Index: DLT-14498
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
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
iNode Care Relay - Bluetooth relay
iNode Care Relay is a programmable Bluetooth 4.0 transmitter, working with iNode Care Sensor. Designed for home automation.
Index: INO-09948
Index: INO-09948
- On sale!
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
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
Transistor switch with adjustable delay - 15A / 36V
The module equipped with transistors powered with the voltage from 5 V to 36 V. T he system allows you to control actuators using microcontroller ports or any development set ....
Index: GRL-12126
Index: GRL-12126
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
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
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
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
Relay module 1 channel with delay - 10A / 250VAC contacts - 5 V coil
The module is equipped with relay SRD-05 with a coil powered with a voltage of 5 V. The system allows you to control actuators using microcontroller ports or any development...
Index: GRL-10917
Index: GRL-10917
Optical relay LC03 - optoisolator
The input voltage from 1.6 V to 2.5 VDC, output impedance up to 10 megohms.
Index: PAS-04863
Index: PAS-04863
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.