Which component is usually illustrated with the NEMA symbol IV?

The NEMA symbol IV designates a specific type of contactor, which is an electromechanical switch used to control electrical power circuits. Contactors are essential components in electrical systems, as they manage the flow of electricity to various devices, enabling or disabling circuits based on control input signals.

In terms of function, contactors are designed to handle high current loads and typically incorporate features like safety and efficiency, making them suitable for various applications, including motor control and lighting systems.

Relay, light, and terminal block do not align with the NEMA symbol IV. A relay is generally designated with different symbols and is usually used for lower current applications, while lights and terminal blocks have separate designs that convey different functional aspects. Each NEMA symbol reflects specific usage or design characteristics pertinent to the component, and IV is consistently associated with contactors.