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A circuit-breaker in which the contacts open and close in air at atmospheric pressure.
An electric motor driven by alternating electric current.
A starter in which the force for closing the main contacts is provided exclusively by electrical energy.
a switch that turns electrical current on and/or off.
An electronic ac converter for changing the frequency.
A circuit-breaker in which the arc develops in a blast of gas.
A switchgear and controlgear that houses motor starters to control electric motors.
A circuit-breaker in which the contacts open and close in oil.
A physical object that is a general term covering switching devices and their combination with associated control, measuring, protective and regulating equipment, also assemblies of such devices and equipment with associated interconnections, accessories, enclosures and supporting structures.
A circuit-breaker in which the contacts open and close within a highly evacuated envelope.