Contactors and Relays

Describe the operating principles of magnetic contactors. Explain how mechanical contactors operate. Describe the operating principles of contactors used as motor starters. Explain how a motor starter operates. Read wiring diagrams involving contactors. Describe the operation of contactors in lighting circuits. Read wiring diagrams involving lighting contactors. Select protective enclosures to match the surrounding environment. Describe the operating principles of relays. Explain the functions of control relays in electrical systems. Read wiring diagrams involving control relays. Explain how solid-state relays operate. Explain the functions of solid-state relays in electrical systems. Read wiring diagrams involving solid-state relays. Explain the functions of overload relays in motor circuits. Describe the operation of thermal overload relays. Troubleshoot contactor/relay problems. List the advantages of low-voltage remote control switching. Design and draw a wiring diagram of a simple remote control circuit. Explain the operation of a low-voltage remote control switching system.