SCR Firing Cards

Additional Details

SCR Firing Cards
SCR Firing Card for Silicon Carbide Heating Elements. Also known as Thyristor Firing Cards.


We offer Complete Set of Single , Two & Three Phase Thyristor Units for control of the Constant or Variable Resistance (Where resistance change with Temperature like SiC & MoSi2 Heating Elements), Inductive or Transformer Coupled Electrical Heating. Two SCRs are connected in inverse parallel and trigger the Pulse for Phase Angle Firing. The delivered Power controls Temperature smoothly and reduces thermo mechanical stress on the Heating Elements and also reduces running cost.

This Power Pack is configured with user selectable input ( 0-5 V dc, 0-10V dc or 4-20 mAmp) with Minimum and Maximum Current Limit facility. One External Potentiometer (Optional) is used to vary the Current within the Limit Range. The Thyristor is mounted on the Heat Sink for dissipating the Heat and protected with Semiconductor Fuse. The Triggering Circuit is also protected with low Amps Glass Fuse. This Unit is easily mounted on the Wall or 35 mm.


Din Rail:


This Unit is specially designed for SiC Heating Elements where Resistance is decreased initially and increase above 800°C. To protect the SiC Heating Elements initially, we offer Power Control System (Which control Voltage as well as Current also) rather than Current Control.   This Unit can also drive without any control Signal due to self generated 0-5V dc signal. So This Unit can also be used in the On-Off Control through C/NC Connection of the Temperature controller.