GT200-J120C系列 ( 永磁電機(jī))電動機(jī)保護(hù)器 ( 以下簡稱保護(hù)器 ) 與交流接觸器組成電動機(jī)保護(hù)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(jī)在常規(guī)負(fù)載，無特殊要求情況下運(yùn)行中可能出現(xiàn)的斷相、連載、堵轉(zhuǎn)、阻塞、三相不平衡等故障進(jìn)行保護(hù)。它具有抗干擾能力強(qiáng)，工作穩(wěn)定可靠、精度高、安裝調(diào)試簡單方便等特點。

功能特征：

1、完善的保護(hù)功能： 由于保護(hù)器內(nèi)部設(shè)有冷態(tài)、熱態(tài)過載保護(hù)特性K系數(shù)曲線檢測電路及不平衡檢測電路，故能夠?qū)﹄妱訖C(jī)起動和運(yùn)行過程中可能出現(xiàn)的斷相、過載、堵 轉(zhuǎn)、阻塞、三相不平衡等故障均采用反時限特性進(jìn)行保護(hù)，解決了電動機(jī)在起動時過載、堵轉(zhuǎn)不保護(hù)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(fù)載，無特殊要求情況下運(yùn)行的電動機(jī)的要求；由于保護(hù)器的斷相檢測環(huán)節(jié)，過電流檢測環(huán)節(jié)互相獨(dú)立，這樣不管是輕負(fù)荷、重負(fù)荷時斷相、過載，不管是起動時還是運(yùn)行中斷相、過載，使電動機(jī)在整個工作過程中均能可靠保護(hù)。

3、明確的狀態(tài)指示： 保護(hù)器設(shè)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(jī)的額定電流值進(jìn)行調(diào)節(jié)即可，操作簡單、方便。 設(shè)有正常運(yùn)行指示和動作保護(hù)后的故障狀態(tài)記憶指示。正常工作時，運(yùn)行指示燈亮，由于保護(hù)器內(nèi)部延時電路按積分Ｋ系數(shù)曲線進(jìn)行計算，運(yùn)行指示燈隨負(fù)載電流情況的大小作不同頻次的閃爍，當(dāng)電機(jī)過載時，保護(hù)器動作后， 過載保護(hù)指示燈點亮，當(dāng)出現(xiàn)斷相或三相電流不平衡故障時，保護(hù)器動作后，斷相指示燈點亮，保 護(hù)器在不同故障保護(hù)動作后，相應(yīng)故障指示燈點亮并鎖定，方便判定故障原因。

4、科學(xué)化的控制： 由于保護(hù)器GT200-J的輔助觸頭輸出接口為獨(dú)立兩組常開形式，保護(hù)器接通電源后保護(hù)輸出輔助觸頭 95、96 閉合，保護(hù)故障脫扣時，保護(hù)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(hù)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(yīng)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(dǎo)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(hù)器對電動機(jī)運(yùn)行時的熱量積累和停機(jī)后的熱量衰減均保持動態(tài)跟蹤、記憶；過流動作保護(hù)后，復(fù)位時間與熱狀態(tài)記憶成正比，解決了電動機(jī)保護(hù)器不能適應(yīng)于負(fù)載頻繁變化的電動機(jī)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.