适用范围 Applicable scope

       热继电器主要适用于交流 50Hz，主电路额定绝缘电压至660V，额定工作电流至630A 电力系统中作为三相交流电动机的过载、断相保护。

       执行标准：GB14048.4、IEC60947-4-1。

        Thermal relay is mainly suitable for AC 50Hz, the main circuit rated insulation voltage to 660V, rated current to 630A power system as a three-phase AC motor overload, phase failure protection.

        Executive Standard: GB14048.4, IEC60947-4-1.

型号及其含义 Model and its meaning

结构特征 Structure

        JR20热继电器的结构采用立体布置式(又称“二层式”)结构，且系列动作机构通用。

        热继电器为二层式，采用拉簧式跳跃动作机构，可以获得良好的瞬间跳跃特性，除具有过载保护、断相保护、温度补偿以及手动和自动复位功能除外，还具有动作脱扣灵活性、动作脱扣指示以及断开检验按钮等功能装置，热继电器通过专用导电板可安装在相应电流等级的交流接触器上。由于设计时充分考虑了CJ20交流接触器各电流等级相间距离，接线高度及外形尺寸。因此可与CJ20很方便地配套安装。

        可以通过电流调整旋钮调整热继电器的整定电流值。电流调节旋钮采用“二点定位”固定方式，消除了在旋动电流调节旋钮时所引起的热继电器动作性能多变的弊端。动作灵活检查机构实现不打开盖板，不通电就可方便地检查热继电器内部的动作情况，动作指示器可清晰地显示出热继电器动作与否。按动检验按钮，断开常闭触头，即可检查通电后控制回路的动作情况。

        当主电路中电动机过载或断相时，热继电器动作，同时动作脱扣指示件弹出显示热继电器已动作。

        热继电器可手动复位，也可自动复位，复位后，热继电器即可再次投入工作。

        JR20 thermal relay structure using three-dimensional layout (also known as "two-tier") structure, and a series of general-purpose action agencies.

        Thermal relay is a two-tier, the use of spring-type jumping action agencies, you can get a good instantaneous jump characteristics, in addition to overload protection, phase failure protection, tempe rature compensation and manual and automatic reset function, but also has the action tripping flexibility, Action trip instructions and disconnect the test button and other functional devices, thermal relays through a dedicated conductive plate can be installed in the corresponding current level AC contactor. Due to the design taking full account of the CJ20 AC contactor current levels of phase spacing, wiring height and dimensions. So it can be easily installed with CJ20.

        The current setting knob can be used to adjust the setting value of the thermal relay. Current adjustment knob with "two-point positioning" fixed mode, eliminating the rotary current adjustment knob caused by thermal relay performance changes abusive drawbacks. Action flexible inspection agencies do not open the cover, do not power can easily check the thermal relay internal action, action indicator can clearly show the thermal relay action or not. Press the test button, disconnect the normally 

closed contact, you can check the control loop after power operation.

        When the main circuit motor overload or phase failure, the thermal relay action, at the same time action trip indicator pop-up display thermal relay has been action.

        Thermal relay can be manually reset, can also be automatically reset, reset, the thermal relay can be put into work again.

主要技术参数 The main technical parameters

外形及安装尺寸 Shape and installation dimensions