Archive For: Relays & Timers

What is a Contactor?

What is a Contactor?

Contactors are a specialized form of relay capable of switching higher power loads such as motors, lighting and electric heaters. Turning large electrical power loads such as motors, lighting and heaters on and off is a common automation requirement. Applications are found in commercial buildings, industrial equipment and vehicles. The fundamental device for switching electrical ... Read More
 
What is a Relay?

What is a Relay?

When used in electrical power and control circuits, relays allow lower power circuits to operate higher power circuits, while providing isolation. By Brent Purdy PE, Product Manager, Power & Circuit Protection at AutomationDirect Relays are a fundamental device for switching an electrical circuit on or off, much like a toggle switch or a limit switch. ... Read More
 
What a Drag!

What a Drag!

CO2 powered drag strip teaches students the science of speed. John Harpell’s 9th grade class at Moira Secondary School in Belleville, Ontario, Canada has built and automated a model racecar track for CO2 powered “dragsters” using various components from AutomationDirect. A CO2 powered dragster is a small lightweight vehicle fitted with a CO2 cartridge; think “pine-wood-derby on ... Read More
 
Electromechanical Relays Versus Solid-State: Each Has Its Place

Electromechanical Relays Versus Solid-State: Each Has Its Place

Since the introduction of solid-state relays some decades ago, the debate over which is better, solidstate relays (SSRs) or electromechanical relays (EMRs), has gone on. The general answer is neither, as each one has good and bad points. But in terms of specific application requirements, clear winners emerge. The Argument for Solid-State Relays When used ... Read More