Switchgear
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In an electric power system, a switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. Switchgear is used both to
High-voltage switchgear
A section of a large switchgear panel
Tram switchgear
This circuit breaker uses both SF6 and air as insulation.
Knife switch
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A knife switch is a type of switch used to control the flow of electricity in a circuit. It is composed of a hinge which allows a metal lever, or knife, to be lifted from or inserted into a slot or ja
Switchgear
…downstream. This type of equipment is directly linked to the reliability of the electricity supply. The earliest central power stations used simple open knife switches, mounted on insulating panels of marble or asbestos. Power levels and voltages rapidly escalated, making opening manually operated switches too dangerous…
Open single-pole single-throw (SPST) knife switch
1917 motor switch, with extra contacts
Dual-pole, dual-throw knife switch in one of its two closed positions