Introduction:
SCRs (Silicon Controlled Rectifiers) are semiconductor devices that are widely used in power control and conversion applications. They are often used in circuits where high current is required. In order to meet the demand for high current, SCRs are connected in parallel.

Explanation:
When SCRs are connected in parallel, the overall current carrying capacity of the circuit increases. This is because the current is divided among the parallel-connected SCRs. Each SCR carries a portion of the total current, reducing the load on each individual SCR.

Benefits of connecting SCRs in parallel:
Connecting SCRs in parallel offers several benefits:

1. Increased current carrying capacity: By connecting SCRs in parallel, the overall current carrying capacity of the circuit is increased. This is particularly useful in applications where high current is required, such as in power electronic converters or motor drive systems.

2. Improved reliability: When SCRs are connected in parallel, the load is shared among multiple devices. This improves the overall reliability of the system, as the failure of one SCR does not result in a complete system shutdown.

3. Reduction in power losses: When SCRs are connected in parallel, the power losses are distributed among the devices. This helps in reducing the power dissipation and improves the overall efficiency of the system.

4. Fault tolerance: Connecting SCRs in parallel provides a level of fault tolerance. If one SCR fails or becomes non-conductive, the other parallel-connected SCRs can still carry the load and keep the system operational.

5. Flexibility in design: Parallel connection of SCRs allows for flexibility in design. It provides the option to scale up the current carrying capacity by adding more SCRs in parallel, without changing the entire system design.

Conclusion:
In conclusion, connecting SCRs in parallel is a common practice to fulfill the demand for high current. It increases the overall current carrying capacity, improves reliability, reduces power losses, provides fault tolerance, and offers flexibility in design. This makes parallel connection of SCRs a preferred choice in many power control and conversion applications.