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A contactor is an electrically controlled switch used for switching an electrical power circuit. [1] A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch. Unlike general-purpose relays, contactors are designed to be ...
A 3-coil autotransformer requires a 3 pole switch to control 3 phase voltages, an examination of figure 9 shows three sine waves displaced at 120 degree intervals. There appears there is no real point on the cycle where all three phases can be switched simultaneously at any equal low motor amperage without resorting to complex staggered ...
NEMA size. NEMA (National Electrical Manufacturers Association) contactors and motor starters are rated by sizes. These sizes are grouped by rated current and power. [1][2] NEMA size. Max. continuous amperes. Max. HP at 200 V, AC. Max. HP at 230 V, AC.
Split-phase electric power. Pole-mounted single-phase transformer with three-wire center-tapped "split-phase" secondary. On the three secondary terminals, the center tap is grounded with a short strap to the transformer case. A split-phase or single-phase three-wire system is a type of single-phase electric power distribution.
A magnetic starter has a contactor and an overload relay, which will open the control voltage to the starter coil if it detects an overload on a motor. [1] [2] The overload relay opens a set of contacts that are wired in series with the supply to the contactor feeding the motor. The characteristics of the heaters can be matched to the motor so ...
The "Utilization category" are mainly categorized in IEC 60947 in the following volume: Volume 1: General requirements. Volume 2: Circuit-breakers. Volume 3: Circuit-breakers, circuit-breakers, switch-disconnectors and switch-fuse units. Volume 4-1: Contactors and motor starters; electromechanical contactors and motor starters [1]
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