GT200-J120C系列 ( 永磁電機)電動機保護器 ( 以下簡稱保護器 ) 與交流接觸器組成電動機保護控制電路。主要用于交流50Hz/60Hz、額定電壓400V-690V、額定電流一次至120A及以下的三相異步電動機在常規(guī)負載，無特殊要求情況下運行中可能出現(xiàn)的斷相、連載、堵轉、阻塞、三相不平衡等故障進行保護。它具有抗干擾能力強，工作穩(wěn)定可靠、精度高、安裝調試簡單方便等特點。

功能特征：

1、完善的保護功能： 由于保護器內部設有冷態(tài)、熱態(tài)過載保護特性K系數(shù)曲線檢測電路及不平衡檢測電路，故能夠對電動機起動和運行過程中可能出現(xiàn)的斷相、過載、堵 轉、阻塞、三相不平衡等故障均采用反時限特性進行保護，解決了電動機在起動時過載、堵轉不保護難題。

2、高可靠性：具有冷態(tài)起動延時時間長，熱態(tài)過載動作迅捷的特點，可以滿足常規(guī)負載，無特殊要求情況下運行的電動機的要求；由于保護器的斷相檢測環(huán)節(jié)，過電流檢測環(huán)節(jié)互相獨立，這樣不管是輕負荷、重負荷時斷相、過載，不管是起動時還是運行中斷相、過載，使電動機在整個工作過程中均能可靠保護。

3、明確的狀態(tài)指示： 保護器設有電流刻度指示，實行旋鈕線性量化整定電流，用戶只要根據(jù)電動機的額定電流值進行調節(jié)即可，操作簡單、方便。 設有正常運行指示和動作保護后的故障狀態(tài)記憶指示。正常工作時，運行指示燈亮，由于保護器內部延時電路按積分Ｋ系數(shù)曲線進行計算，運行指示燈隨負載電流情況的大小作不同頻次的閃爍，當電機過載時，保護器動作后， 過載保護指示燈點亮，當出現(xiàn)斷相或三相電流不平衡故障時，保護器動作后，斷相指示燈點亮，保 護器在不同故障保護動作后，相應故障指示燈點亮并鎖定，方便判定故障原因。

4、科學化的控制： 由于保護器GT200-J的輔助觸頭輸出接口為獨立兩組常開形式，保護器接通電源后保護輸出輔助觸頭 95、96 閉合，保護故障脫扣時，保護輸出輔助觸頭 95、96為斷開狀態(tài)。報警輸出輔助觸頭97、98為閉合狀態(tài)。如果保護器自身故障時，輸出輔助觸頭95、96、97、98均為斷開狀態(tài)，故控制方式更理性化。

5、安裝接線簡單、方便：為適應不同用戶的安裝需求，各個殼架等級采取不同的安裝方式，貫穿式固定及導軌安裝。 大電流采用電纜一次性互感器穿芯，可與主回路完全隔離，適用于不同電壓等級的要求。

6、熱功率記憶： 保護器對電動機運行時的熱量積累和停機后的熱量衰減均保持動態(tài)跟蹤、記憶；過流動作保護后，復位時間與熱狀態(tài)記憶成正比，解決了電動機保護器不能適應于負載頻繁變化的電動機使用場合。

GT200-J120C series (permanent magnet motor) motor protector (hereinafter referred to as protector) and AC contactor form motor protection and control circuit. The main load for AC 50Hz/60Hz, rated voltage 400V-690V, rated current to 120A and below a three-phase asynchronous motor in general, no special requirements may appear under the condition of operation of the off phase, serial, blocking, blocking and unbalance fault protection. The utility model has the advantages of strong anti-interference ability, stable and reliable work, high precision, simple and convenient installation and debugging, etc..

Functional characteristics:

1, perfect protection function: as the protector is arranged inside the cold and hot overload protection characteristics of K coefficient curve detection circuit and unbalance detection circuit, so it can be on the motor starting may appear in the running process of the phase failure, overload, blocking, blocking and unbalance fault using inverse time characteristic to solve the protection, motor overload, while starting block does not protect the problem.

2, high reliability with cold starting delay time is long, the characteristics of thermal overload quick action, can satisfy the normal load, no special requirements under the condition of operation of the motor; because detection protector broken, overcurrent detection link independent of each other, so whether it is light load and heavy load, open phase whether it is overload, when starting or running, the motor overload phase interruption, in the whole process of the work can be a reliable protection.

3, clear state instructions: protector with current calibration instructions, the implementation of the knob linear quantization, adjust the current, the user as long as the motor according to the rated current value can be adjusted, the operation is simple and convenient. With normal operating instructions and action protection after the failure of the state memory instructions. During normal operation, operation indicator light, as the protector of internal delay circuit according to the integral coefficient of K curves, running lights with the load current size for different frequency flicker when the motor overload protector, overload protection action, indicator light, when the fault phase or three-phase current unbalance fault when the phase interruption protector action, indicator light, protection under different fault protection action, the corresponding fault indicator lights and lock, conveniently determine fault.

4, scientific control: because the auxiliary contact output interface protector GT200-J for two independent sets of normal open auxiliary contact form, 95, 96 closed protection output device is power protection, protection tripping protection, output 95 and 96 auxiliary contacts in the off state. The alarm output auxiliary contacts 97 and 98 are closed. If the protector itself fails, the output auxiliary contacts 95, 96, 97 and 98 are disconnected, so the control method is more rational.

5 、 installation wiring is simple and convenient: in order to meet the needs of different users installation, each shell rack level adopts different installation methods, through type fixing and rail installation. The high current adopts the cable once through mutual inductor, and it can be completely isolated from the main circuit. It is suitable for different voltage levels.

6, thermal power protection device on memory: when the motor is running the heat accumulation and heat decay were maintained after stopping dynamic tracking, over-current protection action memory; after the reset time and hot state memory is proportional to the solution to the motor protector can not adapt to the frequent changes of motor load occasions.