# Which of the below mentioned is used in SCR to protect from high dV/dt

Electrical Engineering XYZ MCQs

Which of the below mentioned is used in SCR to protect from high dV/dt:

1. Equalizing circuit
2. Fuse
3. Circuit breaker
4. Snubber circuit

Explanation:
The correct answer to this Electrical Engineering XYZ multiple-choice question “Which of the below mentioned is used in SCR to protect from high dV/dt is: Snubber circuit

In an SCR (Silicon Controlled Rectifier) circuit, dV/dt refers to the rate of change of voltage with respect to time. High dV/dt can cause unintentional triggering of the SCR, leading to malfunction or damage. Therefore, it is essential to protect the SCR from high dV/dt.

A snubber circuit is commonly used for this purpose. A snubber circuit consists of a resistor and a capacitor connected in parallel across the SCR. When a high rate of change of voltage occurs (high dV/dt), the snubber circuit absorbs the excess energy and helps in suppressing voltage transients, thereby protecting the SCR from triggering due to rapid voltage changes.

Let’s briefly look at the other options:

1. Equalizing circuit: An equalizing circuit is primarily used in systems with multiple SCRs to ensure balanced sharing of load current among them. It is not directly related to protecting from high dV/dt.
2. Fuse: Fuses are protective devices used to interrupt excessive current flow in a circuit to prevent damage to components or overheating. They are not specifically designed to protect from high dV/dt.
3. Circuit breaker: Circuit breakers are devices designed to protect electrical circuits from damage caused by overload or short circuit. While they can interrupt current flow in response to overcurrent conditions, they are not specialized for protecting against high dV/dt.

Therefore, among the options provided, the snubber circuit is specifically designed to mitigate the effects of high dV/dt in SCR circuits.