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NEMA (National Electrical Manufacturers Association) contactors and motor starters are rated by sizes. These sizes are grouped by rated current and power . [ 1 ] [ 2 ]
The UMP was designed in the 1990s by Heckler & Koch (HK), as a cheaper, lighter alternative to the MP5, [5] which made heavy use of polymers. [6] The UMP first entered production in 2000. [ 2 ] It was designed primarily for use by American military and law enforcement units, [ 7 ] as the MP5 was not available in .45 ACP, a round which was ...
Circuit breakers with higher ratings can have adjustable trip settings, allowing fewer standardized products to be used, adjusted to the applicable precise ratings when installed. For example, a circuit breaker with a 400 ampere frame size might have its over-current detection threshold set only 300 amperes where that rating is appropriate.
HK 32 (7.62×39 mm Prototype) HK 36 (4.6×36 mm Prototype) Heckler & Koch G11/Heckler & Koch ACR; WSG2000; Heckler & Koch was also a contractor for the XM29 and XM8 projects (both on hold as of 2005), as well as the related XM25. Heckler & Koch HK123 (5.62)
Volume 3: Circuit-breakers, circuit-breakers, switch-disconnectors and switch-fuse units Volume 4-1: Contactors and motor starters; electromechanical contactors and motor starters[1] Volume 4-2: Contactors and motor starters - Semiconductor motor controllers and starters for a.c. voltage
In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments. The device numbers are enumerated in ANSI / IEEE Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations .
[4] [5] [6] Arc fault detection device (AFDD) A circuit breaker triggered by detection of an electric arc; breaks circuit on detecting an electric arc, which could develop from the likes of loose wires. Earth leakage circuit breaker (ELCB) An obsolete circuit breaker triggered by voltage on the earth wiring.
The first high-voltage SF 6 circuit breaker with a high short-circuit current capability was produced by Westinghouse in 1959. This circuit breaker in a grounded tank (called a dead tank), could interrupt 41.8 kA under 138 kV (10,000 MV·A) and 37.6 kA under 230 kV (15,000 MV·A).
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