1.1.1 AC and DC contactors AC and DC contactors are used to connect and disconnect circuits. If combined with appropriate relays (see 1.1.2), they can protect circuits that may experience overload during operation. Note: When a contactor is combined with an appropriate relay for short-circuit protection, it should meet the relevant conditions specified in the circuit breaker standard (GB 14048.2). This section also applies to the operators of contactor relays and specialized contacts for contactor coil circuits. This section also applies to contactors or starters with electronic control electromagnets. 1.1.2 AC Motor Starter AC motor starter is used to start and accelerate the motor to the rated speed, ensure continuous operation of the motor, protect the overload operation (operation) of the motor and its related circuits, and cut off the power supply of the motor. This section applies to overload relays in starters, including electronic overload relays with or without the extended functions specified in Appendix H. Note: Electronic overload relays are also known as "motor protectors" or "motor management systems". 1.1.2.1 Direct (full voltage) AC starter The direct starter is used to start and accelerate the motor to normal speed, protect the motor and its related circuits from overload operation (operation), and cut off the power supply of the motor
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