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The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.
Motor control centers are usually used for low voltage three-phase alternating current motors from 208 V to 600 V. Medium-voltage motor control centers are made for large motors running at 2300 V to around 15000 V, using vacuum contactors for switching and with separate compartments for power switching and control.
The Siemens SD-100 and SD-160 are two related types of high-floor light rail vehicles (LRV), manufactured by Siemens Mobility for the North American market. A total of 431 vehicles were built by Siemens in Florin, California from 1992 to 2013. The SD-100 began production in 1992, and is equipped with direct current traction motors and
The Siemens S200 is a high-floor light rail vehicle (LRV) manufactured by Siemens Mobility in Florin, California, beginning service in 2016. [4] The S200 succeeds earlier Siemens high-floor LRV models, including the SD-100/SD-160 and the SD-400/SD-460. Its low-floor counterpart is the Siemens S700. The S200 is designed specifically for the ...
A Siemens air circuit breaker rated for 1000 V and 2500 A continuous current mounted on a motor control cubicle. Medium-voltage circuit breakers rated between 1 and 72 kV may be assembled into metal-enclosed switchgear line-ups for indoor use or may be individual components installed outdoors in a substation.
A 50 Hz ±5 Hz vibrating-reed mains frequency meter for 220 V. The world's first public electricity supply was a water wheel driven system constructed in the small English town of Godalming in 1881. It was an alternating current (AC) system using a Siemens alternator supplying power for both street lights and consumers at two voltages, 250 V ...