Silicon Controlled Rectifier (SCR) - Disc Type - Testing / Checking

Silicon Controlled Rectifier
An SCR, or Silicon Controlled Rectifier, is a semiconductor, or integrated circuit (IC), that allows the control of current using a small current. Basically, it is a simple direct current (DC) light switch
A silicon controlled rectifier or semiconductor controlled rectifier is a four-layer solid-state current-controlling device.

Where are SCR used?
SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.

How SCR is triggered?
To trigger, or fire, an SCR, voltage must be applied between the gate and cathode, positive to the gate and negative to the cathode. When testing an SCR, a momentary connection between the gate and anode is sufficient in polarity, intensity, and duration to trigger it.

The diodes are termed as uncontrolled rectifiers as they conduct (during forward bias condition without any control) whenever the anode voltage of the diode is greater than cathode voltage. ... Hence, the thyristor is also called as controlled rectifier or silicon controlled rectifier.

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