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.
Relays
Solid state relay SSR Fotek-40DA 40A 480VAC / 32VDC
Relay made in the semiconductor technology SSR Fotek with a working voltage up to 380 V and maximum load current of 40 A.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.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...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...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...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.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...- Reduced price
- Promotion
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...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.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...Three-phase Solid state relay SSR Hoymk D4825HK 3x25A 380VAC / 32DC
The Hoymk D4825HK three-phase relay is made in semiconductor technology and controlled with voltages from 3 V to 32 V DC. The maximum output voltage is 380 V.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...- Reduced price
- 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...- Reduced price
- Promotion
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.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...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.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.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.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 ....16-channel relay module with optoisolation - 10A / 250VAC contacts - 12V coil
The module is equipped with sixteen JQC3F-12VDC-C relays with a 12-volt coil with optoelectronic isolation. The system allows you to control the actuators using the...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...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...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.See also
- Computer accessories
- Automobile accessories
- Cooling
- Diodes
- Sound and acoustics
- Mounting components
- Passive elements
- Wearables (e-textiles, smart clothes)
- Cameras and recorders
- Memory cards & disks
- Communication
- Converters
- Electronics courses
- Microcontrollers
- Animal repellers
- LED lighting
- Programmers
- Voltage regulators
- Artificial intelligence
- Motor drivers and servos
- Integrated circuits
- Displays and screens
- Tablets and smartphones
- Smartwatches
- Consoles
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.