Datasheet > 1489-A2C005

1489-A2C005

更新时间： 2023-08-15 00:00:00

品牌	Logo	应用领域
ROCKWELL		/
页数	文件大小	规格书
22页	441K
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Thermal Magnetic Circuit Breaker

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1489-A2C005 数据手册

Bulletin 1492

Control Circuit and Load Protection

General Information

Technical Information: The Benefits of Limiting Let-Through Energy

Energy Limiting Circuit Breakers Versus Conventional Breakers

The Bulletin 1492-SP line features the unique ability to achieve short circuit interruptions far more effectively than conventional circuit

breakers. In conventional circuit breakers, the short circuit interruption time required is approximately one or two half cycles of an AC sine

wave. When the contacts are open, the resulting arc continues to burn until the current level passes through zero. The arc may re-ignite

because of the insufficient width of the contact gap. The current that flows until the arc is extinguished produces a heating effect proportional

to the I²t value (let-through-energy) of the fault current.

These devices are designed to substantially reduce the amount of let-through-current and the resulting let-through-energy that can damage

protected components. They have the ability to interrupt short circuit current within the first half cycle of the fault. Limiting let-through-energy

will protect against the harmful effects of over-current and is focused primarily on avoiding the following:

ꢀ Excessive heat

ꢀ Mechanical damage

Both of these factors are proportional to the square of the current. Thermal energy is proportional to the square of the RMS value and

magnetic forces are proportional to the square of the peak value. The most effective way to provide protection is to subtantially limit let-

through-energy.This provides the following advantages:

ꢀ Far less damage at the location of the short circuit.

ꢀ Fast electric separation of a faulty unit from the system, especially power supplies connected in parallel that are switched off when the

voltage of the power bus drops below a certain level.

ꢀ Far less wear on the miniature circuit breaker itself. This means more safe interruptions.

ꢀ Better protection of all components in the short circuit path.

ꢀ Far wider range of selective action when used with an upstream protective device. (No nuisance shut downs from feeder line interruptions

causing a blackout in all connected branches.)

Short Circuit Interruption 10 kA - 120V AC

Instant of initiation: 15˚ after voltage zero

Max Arc Voltage

Recovery Voltage

A = Instant when the short is initiated

B = Instant when the contacts open and the arc is initiated

C = Instant when the arc extinguished and the current ceases to flow

79,000 A²S

3,500 A²S

www.ab.com/catalogs

Preferred availability cat. nos. are bold.

7-5

Publication A117-CA001A-EN-P

1 2 345 6 7...22

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与1489-A2C005相关器件

型号	品牌	获取价格	描述	数据表
1489-A2D030	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D060	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D150R	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D250	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D250R	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D320R	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D350	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D350R	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A2D400R	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker
1489-A3C040	ROCKWELL	获取价格	Thermal Magnetic Circuit Breaker

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