What is the operating voltage range for the relay's operating coil?

• A. 50% to 70%
• B. 60% to 90%
• C. 80% to 110%
• D. 90% to 120%

Answer: (C)

The correct choice indicates that the operating voltage range for the relay's operating coil typically falls between 80% and 110% of its nominal voltage. This range is important because it provides the necessary flexibility for the relay to function properly within the limits defined by its design.

Relays are designed to operate reliably when subjected to variations in supply voltage. An operating range of 80% to 110% ensures that even with fluctuations in voltage, the relay will activate and deactivate efficiently. This range allows for minor voltage drops in the system or slight increases in voltage that may occur due to operational conditions without compromising the relay's functionality. It also helps guard against potential damage to the coil from excessive voltage while ensuring reliable operation under lower voltage conditions.

Understanding this range is crucial for engineers and technicians when selecting relays for specific applications to ensure that they fulfill their intended purposes without failure due to voltage irregularities.