適用范圍 Applicable scope
熱繼電器主要適用于交流 50Hz，主電路額定絕緣電壓至660V，額定工作電流至630A 電力系統中作為三相交流電動機的過載、斷相保護。
執行標準：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.
型號及其含義 Model and its meaning
結構特征 Structure
JR20熱繼電器的結構采用立體布置式(又稱“二層式”)結構，且系列動作機構通用。
熱繼電器為二層式，采用拉簧式跳躍動作機構，可以獲得良好的瞬間跳躍特性，除具有過載保護、斷相保護、溫度補償以及手動和自動復位功能除外，還具有動作脫扣靈活性、動作脫扣指示以及斷開檢驗按鈕等功能裝置，熱繼電器通過專用導電板可安裝在相應電流等級的交流接觸器上。由于設計時充分考慮了CJ20交流接觸器各電流等級相間距離，接線高度及外形尺寸。因此可與CJ20很方便地配套安裝。
可以通過電流調整旋鈕調整熱繼電器的整定電流值。電流調節旋鈕采用“二點定位”固定方式，消除了在旋動電流調節旋鈕時所引起的熱繼電器動作性能多變的弊端。動作靈活檢查機構實現不打開蓋板，不通電就可方便地檢查熱繼電器內部的動作情況，動作指示器可清晰地顯示出熱繼電器動作與否。按動檢驗按鈕，斷開常閉觸頭，即可檢查通電后控制回路的動作情況。
當主電路中電動機過載或斷相時，熱繼電器動作，同時動作脫扣指示件彈出顯示熱繼電器已動作。
熱繼電器可手動復位，也可自動復位，復位后，熱繼電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.
主要技術參數 The main technical parameters
外形及安裝尺寸 Shape and installation dimensions
