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The utilization categories category for low-voltage switchgear defines the characteristic operating conditions for switchgear such as contactors, circuit-breakers, circuit-breaker-fuse units, contactor relays, etc. These devices are dimensioned for different electrical loads and for different operating conditions.
Types used in commercial and industrial low-voltage distribution systems are rated to safely interrupt 200,000 amperes. The rating of power circuit breakers varies according to the application voltage; a circuit breaker that interrupts 50,000 amperes at 208 volts might be rated to interrupt only 10,000 amperes at 600 volts, for example.
Conversely, the 4000-series has "borrowed" from the 7400 series – such as the CD40193 and CD40161 being pin-for-pin functional replacements for 74C193 and 74C161. Older TTL parts made by manufacturers such as Signetics , Motorola , Mullard and Siemens may have different numeric prefix and numbering series entirely, such as in the European FJ ...
The model number S700 was adopted by Siemens Mobility in 2019 as a rebranding of a version of the S70 that had been in production since 2014. [9] [2] Versions later branded as the S700 used an adapted form of Siemens' model SF 40 center truck, first used in its SD660 model (first built in 1996 for Portland, Oregon's MAX Light Rail system) to the S70.
NX, formerly known as "Unigraphics", is an advanced high-end CAD/CAM/CAE, which has been owned since 2007 by Siemens Digital Industries Software. [1] [2] In 2000, Unigraphics purchased SDRC I-DEAS and began an effort to integrate aspects of both software packages into a single product which became Unigraphics NX or NX.
Heater ratings for series-string, AC/DC tubes are given in milliamperes; heater ratings for parallel-string tubes are given in volts. A – 4 V heater for 2-cell lead-acid batteries and for AC mains transformers; B – 180 mA DC series heater; C – 200 mA AC/DC series heater
In 1957 Siemens demonstrated the first solid-state rectifier (solid-state rectifiers are now the standard for HVDC systems) however it was not until the early 1970s that this technology was used in commercial power systems. [18] In 1959 Westinghouse demonstrated the first circuit breaker that used SF 6 as the interrupting medium. [19]
The Class 444 fleet was built at Siemens' Vienna plant. [10] [11] Before being shipped to Britain via the Channel Tunnel, the trains were extensively tested at Siemens' Wegberg-Wildenrath Test and Validation Centre in Germany. [10] This was an attempt to reduce the time taken for new trains to enter service, by ironing out any problems beforehand.