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电器通电时,由于衔铁处于释放位置,气隙大,磁阻大,磁通小,铜套阻尼作用相对也小,因此衔铁吸合时***不显著(一般忽略不计)。
而当继电器断电时,磁通变化量大,铜套阻尼作用也大,使衔铁***释放而起到***作用。因此,这种继电器仅用作断电***。
这种时间继电器***较短,JT3系列***长不超过5s,而且准确度较低,一般只用于要求不高的场合。
2.空气式时间继电器
空气阻尼式时间继电器,是利用空气阻尼原理获得***的。它由电磁系统、***机构和触点三部分组成,电磁机构为直动式双E型,触点系统是借用LX5型微动开关,***机构采用气囊式阻尼器。
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Philips Netzwerkkarte P8 CME200
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Siemens Simatic S7 6ES7 336-1HE00-0AB0 E-Stand: 4 ***336
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Siemens S5 6ES5 350-3KA41
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Siemens Siprotec 7SJ6211-5EA00-1FE0/GG
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Siemens Simatic S5 6***1222-0AD20 Stand A6 CP-C30/A1
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Siemens 6SE6420-2AD31-1CA1
Siemens 3RW4422-1B***5 AC
Siemens Servomotor 1FK7040-5AK71-1EB0
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Siemens OP170B Mono 6***6542-0BB15-2AX0
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