What is the acceptable voltage drop across the contacts of a contactor?

The acceptable voltage drop across the contacts of a contactor is typically considered to be 3% of the incoming voltage. This standard is important to ensure the reliable operation of the contactor, maintaining efficient performance and reducing the risk of overheating or contact wear. A 3% voltage drop allows enough current to flow through the contacts without significant losses, which can affect the overall effectiveness of the circuit. Keeping the voltage drop within this range helps to prolong the lifespan of the contactor and ensures that the connected equipment receives adequate voltage for optimal operation. The other options suggest higher levels of permissible voltage drop, which could lead to potential issues such as reduced efficiency, excessive heat generation, or malfunction in the connected loads or devices.