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A contactor is a type of switch. However this switch uses electricity to power an electromagnetic coil to switch on or off power. Hence a contactor needs 2 wires - A live/hot wire and a neutral wire. Generally these are connected across the A1 and A2 terminals of the contactor.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoA contactor is wired with the line voltage connected to the top terminals and the load connected to the bottom terminals. A second circuit is used to energize the contactor coil to draw the contactor's contacts together to complete the circuit to the load.
Wiki User
∙ 12y agoNo wires are needed to control a mechanically held contactor. An electrically held contactor will require two wires to control it.
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∙ 14y agoA three pole contactor is wired with the line voltage connected to the top terminals L1,L2,L3 and the load connected to the bottom terminals T1,T2 and T3.
Wiki User
∙ 14y agoAn electrically held contactor will require two wires to control it.
Wiki User
∙ 10y agoIf the contactor is held in mechanically there would be no coil used to hold the contactor in, therefore no wires to operate no coil.
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What melts if the current in an electric circuit gets too high?
Anything that is in contact with the medium conducting the over-current. In an ideal situation a breaker should trip or a fuse should blow. If not wire insulation can melt, the wire itself can melt or various components can either melt or burn outright. Sq D used a motor overload heater that was used on its motor overload contactor. It was designed as a ratchet on the end of a shaft that was inserted in a barrel on the body of the overload. A melting alloy held the shaft in the barrel. The ratchet on the end of the shaft held a spring loaded contact in the closed position. The body of the overload was bolted in series with the load terminal on the output side of the contactor. When the motor load current heated the overload protection device above its trip point, the alloy melted allowing the shaft to turn in the barrel portion of the overload heater. Being spring loaded the ratchet turned from the spring pressure and opened the normally closed contact thereby opening the magnetics coil circuit, dropping the contactor open and shutting the motor off.
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