Industry Knowledge
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Industry Knowledge
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All Circuit Breakers Have Common Features in Their Operation
May 17, 2013All circuit breakers have common features in their operation, although details vary substantially depending on the voltage class, current rating and type of the circuit breaker. The circuit breaker must detect a fault condition; in ...
Tags: Circuit Breaker, Electrical
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They Are Expected to Carry, and The Maximum Short-Circuit Current
May 17, 2013Circuit breakers are rated both by the normal current that they are expected to carry, and the maximum short-circuit current that they can safely interrupt. Under short-circuit conditions, a current many times greater than normal can ...
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Larger Ratings Have Metal Plates or Non-Metallic Arc Chutes to Divide and Cool The Arc
May 17, 2013Miniature low-voltage circuit breakers use air alone to extinguish the arc. Larger ratings have metal plates or non-metallic arc chutes to divide and cool the arc. Magnetic blowout coils or permanent magnets deflect the arc into the arc ...
Tags: Arc Interruption, Circuit Breaker
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Breakers Protections Against Earth Faults Too Small to Trip an Over-Current Device
May 17, 20131. Breakers for protections against earth faults too small to trip an over-current device: Residual-current device (RCD, formerly known as a residual current circuit breaker) — detects current imbalance, but does not provide ...
Tags: Breakers, Electronics
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High-Voltage Breakers Are Nearly Always Solenoid-Operated
May 17, 2013Electrical power transmission networks are protected and controlled by high-voltage breakers. The definition of high voltage varies but in power transmission work is usually thought to be 72.5 kV or higher, according to a recent definition ...
Tags: Circuit Breakers, High-Voltage
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The Introduction of Magnetic Circuit Breakers
May 17, 2013Magnetic circuit breakers use a solenoid (electromagnet) whose pulling force increases with the current. Certain designs utilize electromagnetic forces in addition to those of the solenoid. The circuit breaker contacts are held closed by a ...
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The Introduction of Medium-Voltage Circuit Breakers
May 17, 2013Medium-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. Air-break circuit breakers replaced ...
Tags: Circuit Breakers, Medium-Voltage
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The Introduction of Trip Breakers
May 17, 2013When supplying a branch circuit with more than one live conductor, each live conductor must be protected by a breaker pole. To ensure that all live conductors are interrupted when any pole trips, a "common trip" breaker must be used. These ...
Tags: Common Trip Breakers, Electrical
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Low Voltage (Less Than 1000 VAC) Types
May 17, 2013Low voltage (less than 1000 VAC) types are common in domestic, commercial and industrial application, and include: MCB (Miniature Circuit Breaker)—rated current not more than 100 A. Trip characteristics normally not adjustable. ...
Tags: Circuit Breakers, Electrical
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The Front-Crash Scores Simulate Striking a Same-Sized Vehicle
May 17, 2013When shopping for a car, you've no doubt compared crash-test ratings. Whether from the government or insurance industry, crash-test scores provide valuable insight into the occupant protection a car provides. But these ratings don't tell ...
Tags: SUVs, Cars, Auto Parts&Accessories
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The Introduction of LT Switchgear
May 17, 2013LT switcher is a safety panel consisting of a number of disconnect-switches that turns on and off the motors, transformers or other electrical appliances. It can be regarded as a power source in the building and production houses, which ...
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The Circuit Breaker Is an Absolutely Essential Device in The Modern World
May 17, 2013The circuit breaker is an absolutely essential device in the modern world, and one of the most important safety mechanisms in your home. Whenever electrical wiring in a building has too much current flowing through it, these simple machines ...
Tags: How Circuit, Electrical
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Weatherizing Is Something Homeowners Think About in Cold Weather
May 17, 2013Weatherizing a home to reduce energy usage and maximize savings is something homeowners think about in cold weather. The fact is, energy efficiency is just as important during summer months, and simple improvements can make a big difference ...
Tags: Weatherizing, Summer
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UL Is Notifying Consumers That The CFL Identified Below Bears a Counterfeit UL Mark
May 17, 2013May 16, 2013 - UL is notifying consumers and retailers that the compact fluorescent lamp (CFL) identified below bears a counterfeit UL Mark for Canada and the United States. It has not been evaluated by UL to the appropriate standards for ...
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Few Flooring Materials Have Stormed The Industry Ramparts Like Luxury Vinyl Tile
May 17, 2013Few flooring materials have stormed the industry ramparts like luxury vinyl tile. At home in commercial as well as residential settings, LVT is expanding options for designers and specifiers alike. For a firmer grasp on this fast-growing ...
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