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SSR relays

Products: 10
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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.
4.8 (5)
Index: DLT-14498
Index: DLT-14498
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Regular price €6.90 Price €6.90

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.
5.0 (7)
Index: DLT-14499
Index: DLT-14499
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Regular price €5.50 Price €5.50

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. 
4.8 (4)
Index: DLT-14503
Index: DLT-14503
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Regular price €8.50 Price €8.50

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
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Regular price €8.50 Price €8.50

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 €23.90 Price €23.90

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.
5.0 (1)
Index: AKS-10221
Index: AKS-10221
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Regular price €30.50 Price €30.50

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.
5.0 (1)
Index: AKS-10219
Index: AKS-10219
Temporarily unavailable
Waiting time: 3-5 days
Regular price €13.90 Price €13.90

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.
4.9 (8)
Index: DLT-14500
Index: DLT-14500
Temporarily unavailable
Waiting time: 1-2 weeks
Regular price €6.90 Price €6.90

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 .
4.8 (4)
Index: DLT-14501
Index: DLT-14501
Waiting for delivery
Availability: April 2024
Regular price €7.90 Price €7.90

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
Temporarily unavailable
Waiting time: 1-2 weeks
Regular price €32.50 Price €32.50

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.