What is the coil rating on the equipment shown in the reference material?

The coil rating of the equipment refers to the voltage level at which the coil operates effectively and safely. If the reference material or accompanying instructions specify that the coil is designed to operate at 120 volts, then this is the appropriate rating to indicate its operational voltage.

In many electrical applications, particularly with relays and contactors, a 120-volt coil is standard in many residential setups, serving as a common choice for low-voltage control circuits. Therefore, if the equipment shown in the material clearly demonstrates a coil designed for 120 volts, then this illustrates why that choice is considered correct.

To fully address why other choices may not apply: if the coil is specifically rated for 120 volts, then claiming it can operate at 240 volts or both 120 and 240 volts would be misleading unless justifications are provided in the reference material indicating it is dual-rated or designed to handle both voltages. If no such qualifications are made, they would not accurately reflect the equipment's capabilities as presented in the reference material.