thyristor silicon controlled rectifier
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The thyristor SCR, or silicon controlled rectifier is a semiconductor device which can be used to switch electric currents. The thyristor SCR was invented in nineteen fifty seven, and today devices are available which are suitable for switching currents ranging from a few milliamps at tens of volts to thousands of amps at thousands of volts.Thyristors are the preferred method of power control in heating applications, offering silent, long life control. Although it is possible to use electromechanical contactors in many applications, the switching frequency required to obtain good temperature control means that in higher power applications, contact life is rarely longer than a year. By contrast thyristors have no short term wearout mechanism, and will operate reliably for the lifetime of most plant. The products described in this brochure are generally much more robust than solid state relays, offering much better surge withstand capability, and operation at higher ambient temperature. They are also fully engineered with built in snubbers, MOV spike protection, semiconductor fuses, EMC filters and protective covers.
Thyristor SCR are very robust devices in semiconductor terms, more so than transistors or IGBT and are well suited to service in industrial environments. Each device conducts current in one direction only, and to control an AC load two devices are connected back to back. Some thyristor scr are sometimes used in some electric motor vehicles to modulate the working voltage in a Jacobson circuit.
The thyristor silicon controlled rectifier models we supply are assemblies of devices wired for the control of AC loads, together with all the necessary control electronics and protection devices, enclosed in a unit suitable for mounting in a control cabinet.
For more information on the range of thyristor silicon controlled rectifier's you can contact us via our contacts page. One of our team will be able to assist you with your requirements.