Vacuum contactors today are applied on low voltage and medium voltage systems up to 15kV on motors, standard and high efficiency induction, synchronous, wound rotor slip-ring, transformer feeder switching and capacitor switching. Transformer and capacitor switching is often done at higher voltages than 15kV with vacuum contactors or vacuum circuit breakers.
Most motor contactors at low voltage (600V or less) do not use any special measures to suppress the arc. The contacts are surrounded by normal air at atmospheric pressure which extinguishes the arc. These starter contactors are called air break contactors.
Limit Switches
A limit switch is a switch preventing the travel of an object in a mechanism past some predetermined point, mechanically operated by the motion of the object itself.
Push buttons are simple buttons that are used as switches to open or close electrical contacts. Selector switches are essentially push buttons that can be turned to have the same result. And pilot lights are used to symbolize the event has happened.
A relay is an electromagnetic switch worked by a moderately little electric flow that can control a bigger electric flow. The electromagnet is the main component of a relay. Sensors are a component of electronic equipment and relays help with the functionality. Relays connect the smaller electrical flow to larger ones. Relays can work as switches or converters.
Vitrohm pressed steel rheostats furnish a simple, accurate and economical method of field control. They are universally applied for adjusting generator, alternator and exciter field currents to obtain variations in output voltage and for field control of adjustable speed D.C. and synchronous motors. Other typical applications include heater, furnace, battery charging and other controls.
