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Relay

Relay info

Relays are electronically controlled switches. For mechanical switches in relays, electromagnets are used. Besides these, solid state relays which don’t have any moving parts are also used. Relays are used when high currents have to be controlled with low level signals or controlling multiple circuits from a single source.

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The first relay applications are used in telegraph operations to amplify signals. In these applications telegraph signals were losing amplitude because of being transferred over long distances. Relays were used to amplify the lower signal. The first examples of relays are used in phone communication and logical operations in computers.

Relays which are used to directly control high loads like electric motors are called contactors. Solid state relays which are used in power applications use semi conductors for switching instead of moving mechanical parts. Relays are used to protect circuits from heavy load or errors. In modern electric power systems these protections are carried on by digital tools, but these are still called “protective relays”.

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The sensor card that outputs the relay when it detects fire. It is ideal for projects like fire alar..
$4.00
A single role control card is a relay card that can be used with Arduino or other microcontrollers w..
$1.50
1 Channel 5V Relay Module is ideal for single chip microcontroller and household appliance control a..
$1.50
Relay Cards are designed for use on project development platforms (Arduino, Raspberry Pi, LattePanda..
$4.00
Thermostatted relay card which can be used for temperature controlled switching operations. With the..
$5.00
Relay Cards are designed for use on project development platforms (Arduino, Raspberry Pi, LattePanda..
$20.00
Relay Cards are designed for use on project development platforms (Arduino, Raspberry Pi, LattePanda..
$22.00
A 16-way relay control card is controllable with 12V, various contact cards can be controlled with v..
$13.00
The 2 relay control card is controllable by various development cards which can control the contacts..
$2.00
The 4-way relay control card is a relay card that can be used with Arduino or other microcontrollers..
$3.00
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$4.00
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$6.00
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$11.00
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$20.00
The relay on the card is the triggering module according to the amount of light in the environment. ..
$4.00
Relay Cards are designed for use on project development platforms (Arduino, Raspberry Pi, LattePanda..
$6.00
8 relay control card is controllable by various development cards, the contacts can be controlled by..
$6.00
Amplifier card with 8 outputs that you can use with your microcontroller. The operating principle is..
$22.00
2 Channel 5V Relay Module can control DC and AC signals including 220V AC load. There is one normall..
$2.00
4 Channel 5V Relay Module can control DC and AC signals including 220V AC load. There is one normall..
$3.00