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规格及用途 |
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NR3（JR29）系列热过载继电器主要用于交流50Hz或60Hz，额定工作电压至660V，额定工作电流至500A的电力线路中。用作三相感应电动机的过载与继相保护，常与B系列交流接触器配合组成电磁起动器。
NR3－16、NR3-25热继电器为摩擦脱扣式动作机构，带断相保护；NR3－45SA为拉簧式脱扣动作机构（跳跃机构），带断相保护；NR3－170、NR3－105为背包跳跃机构、NR3－250、NR3－370为主回路带互感器的踊跃式机构，均带断相保护。
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