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Selection of Solid state relay model specifications

Selection of Solid state relay model specifications

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  • Time of issue:2023-03-06 14:56
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(Summary description)When we usually buy a Solid state relay model, we may already have a certain understanding of the solid state relay itself, as well as the working principle and usage method, but we may know little about its model and specifications. Now let me explain this aspect to you.

Selection of Solid state relay model specifications

(Summary description)When we usually buy a Solid state relay model, we may already have a certain understanding of the solid state relay itself, as well as the working principle and usage method, but we may know little about its model and specifications. Now let me explain this aspect to you.

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  • Time of issue:2023-03-06 14:56
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When we usually buy a Solid state relay model, we may already have a certain understanding of the solid state relay itself, as well as the working principle and usage method, but we may know little about its model and specifications. Now let me explain this aspect to you.

Best Solid state relay model from China manufacturer
When we choose the Solid state relay model, we mainly choose the solid state relay (SSR) with the appropriate rated current. Unless otherwise specified, the rectification, controllable and other power modules are also the same.
The rated current of the solid state relay is selected according to different load types. Resistive loads, inductive loads and capacitive loads have a large instantaneous current when they are just starting. Even if it is purely resistive, due to its positive temperature coefficient, the resistance value in the cold state is small, so it has a large starting current. When the electric furnace is just turned on, the current is 1.3-1.4 times that of the stable state. When the incandescent lamp is turned on, the current is 10 times that of the steady state. Some metal halide lamps not only turn on for as long as 10 minutes, but also have pulse currents as high as 100 times the steady state.
Solid state relay model manufacturers tell you that the starting current of asynchronous motors is 5-7 times the rated value, and the starting current of DC motors is even larger. Not only that, the inductive load also has a high back EMF. This is an indeterminate value that varies with L and di/dt. It is usually 1-2 times the power supply voltage, so it is superimposed with the power supply voltage. There are up to three times the supply voltage.
Capacitive loads are more dangerous, because when starting, the capacitor (load) is equivalent to a short circuit because the voltage across the capacitor cannot change suddenly. This kind of load should pay special attention when selecting the type.
The manufacturer of the Solid state relay model tells you that it is necessary to point out that the user should not use the inrush current value of the solid state relay as the basis for selecting the load starting current. The surge current value of the solid state relay is based on the surge current of the thyristor. Its prerequisite is half (or one) power cycle. ie 10 or 20ms. The above-mentioned start-up process ranges from a few hundred milliseconds to a few minutes, and up to 10 minutes at most. Please pay attention to this point.

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