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2. Contactor - Wikipedia

   en.wikipedia.org/wiki/Contactor

   AC contactor for pump application. 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.

3. Utilization categories - Wikipedia

   en.wikipedia.org/wiki/Utilization_categories

   Volume 4-2: Contactors and motor starters - Semiconductor motor controllers and starters for a.c. voltage Volume 5-1: Control apparatus and switching elements - Electromechanical control apparatus[1] Volume 6-1: Multi-function switchgear and controlgear - Mains switches (categories AC-32A/B)

4. NEMA size - Wikipedia

   en.wikipedia.org/wiki/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]

5. NEMA contact ratings - Wikipedia

   en.wikipedia.org/wiki/NEMA_contact_ratings

   The current rating of smaller NEMA contactors or their auxiliaries are defined by NEMA ICS 5: Industrial Control and Systems, Control Circuit and Pilot Devices [1] standard. The nomenclature is a letter followed by a three-digit number, the letter designates the current rating of the contacts and the current type (i.e., AC or DC) and the number ...

6. High-voltage direct current - Wikipedia

   en.wikipedia.org/wiki/High-voltage_direct_current

   Long distance HVDC lines carrying hydroelectricity from Canada's Nelson River to this converter station where it is converted to AC for use in southern Manitoba's grid. A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. [1]

7. DB Class E 410 - Wikipedia

   en.wikipedia.org/wiki/DB_Class_E_410

   Speed regulation of the motors was achieved by progressively excluding by means of contactors the starting rheostat resistors, with a total of 72 acceleration steps. [21] Once the maximum supply voltage of the motors was reached, a further increase in their speed was possible by means of an additional circuit to control shunt. [21]