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In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space. This made the Zinsco brand hugely popular with contractors and millions of Zinsco service panels and load centers were installed through the 60s and 70s.
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches ().They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.
The micro ribbon or miniature ribbon connector is a common type of electrical connector for a variety of applications, such as in computer and telecommunications equipment having many contacts. The connector contains two parallel rows of contacts within a shielded case having a characteristic D-shape similar to that used in D-subminiature ...
In electrical engineering, a disconnector, disconnect switch or isolator switch is a type of switching device with visible contacts, used to ensure that an electrical circuit is completely de-energized for service or maintenance.
IEEE 200-1975 or "Standard Reference Designations for Electrical and Electronics Parts and Equipments" is a standard that was used to define referencing naming systems for collections of electronic equipment. IEEE 200 was ratified in 1975. The IEEE renewed the standard in the 1990s, but withdrew it from active support shortly thereafter.
Pin Layout Pin thickness Specification Period Examples European / Pro Electron numeric range Pee-Wee B3A: US Pee Wee 3p: 3: 08.7mm triangle with pins 1&3 closest [31] 2.36mm [32] 1937 - ZA1004 - Mazda subminiature B3G [33] European special all-glass miniature: 3 (+top) 06.0mm line with 3mm spacing: 1mm: Mazda: 1937 - D1, EA50 [34] - European 3 ...
This convention is currently defined in ASME Y14.44-2008, which supersedes IEEE 200-1975, which in turn derives from the long-withdrawn MIL-STD-16 (from the 1950s), highlighting the heritage of this connector naming convention. [36] IEEE 315-1975 works alongside ASME Y14.44-2008 to define jacks and plugs. The term jack occurs in several related ...