Consider the following statements regarding static relays compared with electromechanical relays :
1. In static relays, frequent operations cause deterioration.
2. In static relays, there is a quick resetting and absence of overshoot.
3. Static relays are sensitive to voltage transients.
Which of the above statements is/are correct?

Question

Consider the following statements regarding static relays compared with electromechanical relays :

1. In static relays, frequent operations cause deterioration.

2. In static relays, there is a quick resetting and absence of overshoot.

3. Static relays are sensitive to voltage transients.

Which of the above statements is/are correct?

Prepp Team · Accepted Answer

Static vs. Electromechanical Relays: Statement Analysis

This solution analyzes the given statements comparing static relays and electromechanical relays to determine their correctness.

Statement 1: In static relays, frequent operations cause deterioration.
This statement is incorrect. Static relays utilize solid-state electronic components without moving parts. Unlike electromechanical relays, they do not suffer from mechanical wear and tear due to frequent operations. Their lifespan is generally determined by the endurance of the electronic components, not the number of operations.
Statement 2: In static relays, there is a quick resetting and absence of overshoot.
This statement is correct. Static relays respond much faster than electromechanical ones. Their electronic nature allows for rapid resetting (returning to the normal state after a fault is cleared) and minimizes or eliminates overshoot, which is a common issue in electromechanical relays due to inertia.
Statement 3: Static relays are sensitive to voltage transients.
This statement is correct. The sensitive electronic components within static relays can be vulnerable to damage or malfunction caused by voltage spikes or transients. Protective measures like filters and shielding are often necessary to mitigate this sensitivity.