Are formation may occur through a hot gas ejected from a moulded-case circuit breaker (MCCB) between the source-side terminals of the MCCB. The formation of the are in the hot gas was studied. Electrodes of 1 mm diameter with a gap length of 3 mm were located near the exhaust hole of the hot gas to record the time variation of the conductance of the hot gas. The conductance was found to increase gradually for a time and then to rise abruptly on the occurrence of the arcing phenomenon. The arcing phenomenon was shown to occur when the gas conductance and the voltage applied across the hot gas reached 30 mS and 300 V respectively. From this critical conductance, the critical values of electrical conductivity and temperature were estimated to be 3.4-4.5 S m(-1) and 3800-4100 K, respectively. [References: 8]
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机译：从模制断路器（MCCB）的MCCB的源极侧端子之间喷出的热气体可能会形成气体。研究了热气中芳烃的形成。将直径为1 mm，间隙长度为3 mm的电极放置在热气的排气孔附近，以记录热气的电导率随时间的变化。发现电导在一段时间内逐渐增加，然后在发生电弧现象时突然增加。当气体电导和施加在热气上的电压分别达到30 mS和300 V时，就会出现电弧现象。根据该临界电导，电导率和温度的临界值分别估计为3.4-4.5 S m（-1）和3800-4100K。 [参考：8]
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