What is the main difference between a relay and a contactor?

The main difference between a relay and a contactor lies in their operational capabilities, particularly in terms of current handling. A relay typically operates at a lower amperage compared to a contactor, which is designed to handle higher current loads. This distinction is important because it affects the type of applications in which each device is used.

Relays are commonly utilized in control circuits, automation systems, and low-power applications where smaller voltages and currents are sufficient to perform the required functions. They serve to switch smaller loads and are ideal for tasks like control signaling. On the other hand, contactors are specifically engineered for switching larger electrical loads, making them suitable for heavy-duty applications such as motor control and large industrial equipment.

The other options don't accurately describe the fundamental differences. For example, the statement that a relay has a higher amperage rating is not correct since relays typically handle lower amperage compared to contactors. The inclusion of a manual override is not a distinguishing feature of relays; it can be found in various types of switches and control devices. Lastly, stating that relays are used only for lighting circuits is misleading, as they can be employed in various applications beyond lighting. Thus, the correct answer highlights the essential aspect of relays operating at