我們?nèi)绾螀^(qū)分?jǐn)嗦菲鞯姆謹(jǐn)嗄芰Γ?/h3>

來(lái)源：http://www.xzthjc.com/ 日期：2021-05-31 發(fā)布人：admin

斷路器的分?jǐn)嗄芰κ菙嗦菲鞯囊豁?xiàng)重要指標(biāo)，是指斷路器安 全切斷故障電流的能力，一般分為額定限短路分?jǐn)嗄芰CU和額定運(yùn)行短路分?jǐn)嗄芰CS。分?jǐn)嗄芰τ?5KA、50KA、60KA、80KA等多種規(guī)格，而國(guó)內(nèi)的小型斷路器其限短路能力一般在4-6KA之間，而且分?jǐn)嗫煽啃圆桓摺?

Breaking capacity of circuit breaker is an important index of circuit breaker, which refers to the ability of circuit breaker to safely cut off fault current. It is generally divided into rated limit short-circuit breaking capacity ICU and rated operation short-circuit breaking capacity ICs. The breaking capacity has 35ka, 50kA, 60kA, 80kA and other specifications, while the short-circuit limiting capacity of domestic miniature circuit breakers is generally between 4-6ka, and the breaking reliability is not high.

假如ICU=50KA，那么當(dāng)電路中發(fā)生50KA故障電流時(shí)，斷路器可以安 全的切斷電路，而不會(huì)發(fā)生觸頭粘接等狀況，但發(fā)生限短路分?jǐn)嗟臄嗦菲鞑豢梢栽偈褂?。而假如IUS=50KA，當(dāng)發(fā)生50KA故障電流時(shí)，斷路器可以安 全切斷電路，在故障排除時(shí)可以再合閘使用，當(dāng)然也是更換斷路器。

If ICU = 50kA, then when 50kA fault current occurs in the circuit, the circuit breaker can safely cut off the circuit without contact bonding and other conditions, but the circuit breaker with limited short circuit breaking can no longer be used. And if IUS = 50kA, when 50kA fault current occurs, the circuit breaker can safely cut off the circuit, and it can be reclosed for use when troubleshooting. Of course, it is also to replace the circuit breaker.

選擇斷路器的一項(xiàng)重要原則就是斷路器的限短路分?jǐn)嗄芰σ笥诰€路的預(yù)期短路電流。無(wú)論哪種斷路器，它的短路分?jǐn)嗄芰Χ即笥诨虻扔谄溥\(yùn)行短路分?jǐn)嗄芰Α?/div>

An important principle in selecting circuit breakers is that the short-circuit breaking capacity of circuit breakers should be greater than the expected short-circuit current of lines. No matter what kind of circuit breaker, its short-circuit breaking capacity is greater than or equal to its operating short-circuit breaking capacity.

斷路器的分?jǐn)嗄芰κ欠裨酱笤胶媚?，那是肯定的。分?jǐn)嗄芰υ酱?，?全性越高。例如當(dāng)選擇ICU為35KA時(shí)，如果線路中短路電流為20KA時(shí)為及時(shí)安 全切斷；但如果ICU為20KA，則短路電流為35KA時(shí)就無(wú)法斷開(kāi)了。雖然分?jǐn)嗄芰υ酱笤胶?，但是價(jià)位也會(huì)越高，還是要根據(jù)自身使用情況在保證足夠安 全的前提下，經(jīng)濟(jì)的選擇合適的斷路器。

It is certain that the greater the breaking capacity of the circuit breaker, the better. The greater the breaking capacity, the higher the safety. For example, when the ICU is 35ka, if the short circuit current in the line is 20KA, it is safe to cut off in time; However, if the ICU is 20KA, it cannot be disconnected when the short-circuit current is 35ka. Although the greater the breaking capacity, the better, but the price will also be higher, or according to their own use, in the premise of ensuring sufficient safety, the economic choice of the appropriate circuit breaker.

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