Relays are electrically-operated switches that regulate power to downstream circuits when energized to control low-current equipment, devices, machinery, and electrical systems. General purpose and power relays use input signals and low voltages to control larger circuits. Time-delay relays open and close their contacts at preset times. Monitoring relays detect changes in operational or environmental conditions and protect downstream equipment from damage. Safety relays monitor operational and environmental conditions and disrupt power to protect workers. Solid-state relays have no moving parts and provide long service lives. Alternating relays toggle between loads to sequence load matching and distribute equal run times. Automotive relays regulate the flow of power through circuits to control vehicle components. Relay sockets mount on surfaces to interface relays with electrical connections.