The relays can be divided into two groups differing in terms of control and mechanism of work. These are electromechanical relays and SSR semiconductor relays. The second group includes relays otherwise known as electronic relays. Their construction is based on transistors, thyristors and triacs. They are logical systems for switching voltage, current and frequency. The control system has no moving parts. The control is called non-contact or electronic. SSR semiconductor relays are useful for anyone planning to build an electronic model, i.e. induction furnace or dryer. We use them in projects that require a very precise technological process, above-average speed of operation, but also a maximum limited downtime. They are used in devices controlling engines, heating devices and incandescent lamps. They are excellent for industrial control systems, intelligent lighting, temperature control, as well as electric drive control systems.
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SSR relays
Products: 15
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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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Solid state relay SSR Fotek - 75A 380VAC / 32VDC
Solid state relay, single-phase SSR Fotek with the AC voltage of 380 V and direct of 32 V. Rated current is 75 A.
Index: DLT-14503
Index: DLT-14503
Solid state relay SSR-40A 440VAC / 40A - 32VDC
Solid state single phase SSR with 440 V AC and 32 V DC. The rated current is 40 A.
Index: AKS-10219
Index: AKS-10219
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
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.
Index: DLT-14500
Index: DLT-14500
Solid state relay SSR Fotek - 60A 380VAC / 32VDC
Solid state relay, single-phase SSR Fotek with the AC voltage of 380 V and DC voltage of 32 V. Rated current is 60 A.
Index: DLT-14502
Index: DLT-14502
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
Solid state relay SSR Fotek 50DA 50A 480VAC / 32VDC
Relay made in semiconductor technology SSR Fotek with an output voltage of up to 380 VAC and the control, input voltage of up to 32 VDC. Output current up to 50 A .
Index: DLT-14501
Index: DLT-14501
Solid state relay SSR Fotek-25DA 25A 480VAC / 32VDC
Relay SSR Fotek made in the technology of solid state with a working voltage up to 380 V and a maximum load current of 25 A.
Index: DLT-14499
Index: DLT-14499
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
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
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.
Index: DLT-14507
Index: DLT-14507
Grove - 4 Channel Solid State Relay
Module from the Grove series with 4-channel relay SSR with control voltage of 5 V and rated voltage of contacts of 240 V AC and 2 A. Due to the application of semiconductor...
Index: SEE-14743
Index: SEE-14743
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SparkFun Qwiic Quad Solid State Relay Kit - SparkFun KIT-16833
Set consisting of 4 relays SSR-40DA , plates for their mounting, wires and screws. Controlled via the I2C bus. The operating voltage is in the range of 2.5 V to 3.6 V (3.3 V...
Index: SPF-21302
Index: SPF-21302
SparkFun Qwiic Dual Solid State Relay - 2 channel SSR - 12-280 VAC/25A - Qwiic - SparkFun COM-16810
Designed for experienced users , an advanced module with two SSR semiconductor relays in the SSRF240D25 system. The operating voltage is in the range of 2.5 V to 3.6 V...
Index: SPF-21303
Index: SPF-21303
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Functions and use of SSRs
SSR solid-state relays have three basic functions. The first one is galvanic separation, i.e. separation of electrical potentials. There are projects where it is necessary to isolate the control circuit from the working circuit in order to protect the control planes from possible malfunctions and failures, as well as interference in the area of interference currents. This is only possible with a tightness of at least 3 mm between the transmitter and receiver. The semiconductor relay should withstand a voltage of at least 2.5 kV. The second function of the relay is to process signals that appear between separated circuits. It is designed for this transoptor, one of the basic components of which the relay is built. It is responsible for precise matching of different voltage potentials of signals that occur in both operating and control circuits.
The last function of the SSR solid-state relay is switching gain. If the current and voltage are higher than the photoelectric transistor rating, an extra circuit is used to amplify the switching. During switching, the base current is activated in the conveyor by means of a phototransistor and an LED. The second semiconductor takes control of the base current.
Performance of SSRs
The construction of the SSR semiconductor relays is based on a transoptor. It consists of at least one transmitter and a receiver. The task is to separate the control circuit from the working one. The transoptor is an electronic element, without mechanical parts, which are susceptible to rapid wear. In the control circuit a light signal is triggered by means of an LED, which initiates switching operations. The reflected light intensity is measured with a phototransistor. The function of the transmitter is usually performed by the LED, which emits infrared light.
As the optoelectronic elements are arranged opposite each other, it is possible to receive the light directly, for which the receivers are responsible. If the transmitter and the receiver are arranged in one plane, the light beam is transmitted by reflection, i.e. according to the light-guide principle. However, it is necessary to know that the optocoupler allows for one-way flow of signals from input to output circuit.
The optocoupler phototransistor can only be loaded with low current and voltage values. If they are higher, it is necessary to use additional semiconductor element. Its function is to switch the corresponding rated voltages and currents. A bipolar transistor is used for this purpose, which works very well at low load currents ≤0.5A. For high load currents, a unipolar transistor with an insulated MOSFET gateway is used, generating low leakage currents <10 μA. A triac whose functioning is similar to that of diodes can also be used, so it is a good option for AC currents.