Q.Write the diagram of SCR protection circuit.

The SCR protection circuit combines several elements, each guarding the device against one type of stress. …

[!TLDR]

SCR in the main line, protected by a CB + fuse (over-current), a series inductor L (di/dt), an MOV (over-voltage), and an R-C snubber (dv/dt).

The SCR protection circuit incorporates several protection elements, each countering one type of stress:

• A suitably rated semiconductor FUSE coordinated with a fast circuit breaker (CB), connected in series in the main line, protects against over-current.
• A proper inductor L connected in series with the device limits the rate of rise of current, giving di/dt protection.
• A Metal Oxide Varistor (MOV) connected across the device absorbs large, short-duration voltage spikes/over-voltages.
• An R-C snubber circuit (resistor R in series with capacitor C) connected across the device limits the rate of rise of voltage, giving dv/dt protection. …