084f2db8c6 AC-15 - Control of electromagnetic loads (>72 VA) DC-13 - Control of electromagnets . Arc Suppression Technologies. Vacuum contactor[edit]. The coil may be energized at the same voltage as a motor the contactor is controlling, or may be separately controlled with a lower coil voltage better suited to control by programmable controllers and lower-voltage pilot devices. References[edit].
A somewhat greater amount of power is required to initially close a contactor than is required to keep it closed. Third, relay coil inductance can produce high-voltage transients when the device deenergizes. A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings.[1] A contactor is controlled by a circuit which has a much lower power level than the switched circuit. The deflection opens the relay contact to open. The shader ring forces the magnetism developed in part of the core to lag that of the remainder of the core. Most ac switching types employ "zero-voltage crossover," which minimizes surge currents. The extremely high temperature of the arc (tens of thousands of degrees Celsius) cracks the surrounding gas molecules creating ozone, carbon monoxide, and other compounds. For example, electromechanical relays can have numerous contacts electrically isolated one from another. The AC arc generated upon opening of the contacts will self-extinguish at the zero-crossing of the current waveform, with the vacuum preventing a re-strike of the arc across the open contacts. Capacitor-switching contactors are specially designed to switch banks of capacitors.
Swordvishv replied
473 weeks ago