西门子资料专区

简介：
问题: 除了技术资料所描述的熔断器之外，微型断路器能保护3TK28的使能电路吗？ 解答: 不能使用微型断路器MCB来保护3TK28单元的使能电路。与熔断器的作用相反，短路（测试 电流1KA，依照IEC 947-5-1）时过高的断路器通过电流会导致触点熔连。 条目号:21450510 日期:2006-03-28 QUESTION: Is it possible to protect enable circuits of 3TK28 with miniature circuit-breakers instead of fuses as shown in technical publications? ANSWER: Miniature circuit-breakers MCBs for the protection of enable circuits of 3TK28 units are not permissible. As opposed to fuses the relatively high MCB let-through current in case of a short-circuit (test current 1 kA acc. to IEC 947-5-1) would cause contact welding. Entry ID:21450510 Date:2005-04-06