适用范围 Applicable scope

        JR28系列热过载继电器(以下简称继电器)主要用于交流50Hz(60Hz)，额定工作电压660V及以下，额定工作电流0.10-93A的电路中，作作电路和电动机的过载、断相、启动时间过长和堵转时间过长的保护。

        热继电器具有断相保护、温度补偿、整定电流调节、自动复位和手动复位任意选择、动作指示信号、动合、动断辅助触头绝缘分开、安装面积小、安装方式多样等功能和特点，具有测试按钮和停止按钮。可进行动作灵活性检查。有防止手指触电护罩，使用安全。有闭锁装置防止误操作等。

        执行标准：GB14048.4、IEC60947-4-1。

       JR28 series thermal overload relay (hereinafter referred to as the relay) is mainly used for AC 50Hz (60Hz), rated voltage 660V and below, the rated current of 0.10-93A circuit, as the circuit and motor overload, phase failure, start-up time Long and blocking the protection of the long time.

       Thermal relay with phase protection, temperature compensation, setting current regulation, automatic reset and manual reset any choice, the action instructions signal, moving together, broken off auxiliary contacts isolated insulation, installation area is small, the installation of a variety of functions and features, with Test button and stop button. Action flexibility check. Have to prevent finger electric shock shield, safe to use. A locking device to prevent misuse and so on.

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

型号及其含义 Model and its meaning

使用环境条件 Use of environmental conditions

◇ 周围空气温度：空气温度上限为+40℃；空气温度24h的平均值不超过+35℃；空气温度下限为-5℃。

◇ 安装地点的海拔不超过2000m。

◇ 大气相对湿度在周围空气+40℃时不超过50%，在较低温度下可以有较高的相对湿度，湿月平均相对湿度为90%，同时该月的月平均低+25℃，并考虑到因温度变化发生在产品上的凝露。

◇ 污染等级为3。

◇ 安装类别Ⅲ类。

◇ 安装位置应与垂直面的安装倾斜度不超过5°；应安装在无振动和冲击的地方。

◇ Ambient air temperature: the upper limit of air temperature is + 40 ℃; the average of air temp erature 24h does not exceed + 35 ℃; the lower limit of air temperature is -5 ℃.

◇ installation site elevation not exceeding 2000m.

◇ Ambient relative humidity in the surrounding air +40 ℃ does not exceed 50%, at lower temp eratures can have a higher relative humidity, the wettest month average maximum relative hum idity of 90%, while the monthly average minimum +25 ℃ , And taking into account the condens ation on the product due to temperature changes.

◇ pollution level is 3.

◇ installation category Ⅲ category.

◇ installation position should be installed with the vertical tilt of not more than 5 °; should be installed in the absence of significant vibration and impact of the place.

主要技术参数 The main technical parameters

◇ 基本参数

◇ 主电路额定绝缘电压AC660V；额定工作电流25A、36A、93A。

◇ 辅助电路额定绝缘电压AC500V；额定频率50、60Hz；使用类别、额定工作电压、额定工作电流和额定发热电流见表2。

◇ basic parameters

◇ main circuit rated insulation voltage AC660V; rated working current 25A, 36A, 93A.

◇ auxiliary circuit rated insulation voltage AC500V; rated frequency 50,60Hz; use category, rated working voltage, rated current and rated 

     current Table 2.

◇ 热继电器的额定工作电流、额定工作电流调节范围、适配交流接触器型号及推荐熔断器型号见表1。

◇ thermal relay rated current, rated current adjustment range, suitable for AC contactor models and recommended fuse models in Table 1.

外形及安装尺寸 Shape and installation dimensions

◇ 热继电器在各项负载不平衡时的动作特性符合表4的规定。

◇ thermal relay in the load imbalance when the operating characteristics in line with the provisions of Table 4.

◇ 复位性能  reset performance

◇ 热继电器动作后，手动复位时间不大于2min，自动复位时间不大于8min。

◇ thermal relay action, the manual reset time is not greater than 2min, automatic reset time is not greater than 8min.

结构特征 Structure

◆ 热继电器的内部结构

◇ 热继电器的内部结构为安装平面呈层式立体布置结构，即动作机构(支座)在前面，热一双元件在后面，这种结构的特点是：能与相应的交流接触     器构成组合安装，减少安装面积；整定电流调节、复位、停止试验诸按钮及动作指示等功能组件，均可布置在盖前的平面上，操作方面，功能     指示直观。内部结构电气示意见图4。

◆ thermal relay internal structure

◇ The internal structure of the thermal relay for the installation plane was three-dimensional layout of the three-dimensional struc ture, that the action mechanism (support) in the front, a pair of hot elements in the back of this structure is characterized by: with the corresponding AC contactor combo installation, Reduce the installation area; adjust the current setting, reset, stop the test button and action instructions and other functional components, can be arranged in front of the plane, the operation, the function instructions intuitive. The internal structure of the electrical schematic shown in Figure 4.

◆ 热继电器的基本工作原理

◇ 热继电器属双金属片式，其热元件与被保护对象的主电路串接，负载电流通过热元件和双金属片(复式加热)，利用热一双元件的热效应，使双金属片弯曲，但负载电流在其预置值(一般为保护对象的额定电流)1.2倍及以上时，热一双元件产生的热量使双金属元件弯曲推动滑板使热继电器的动作机构脱扣，将电源切断，被保护对象到保护。

◆ The basic working principle of thermal relay

◇ thermal relay is a bimetallic strip, the thermal element and the main circuit of the object being protected in series, the load current through the thermal element and the bimetal (duplex heating), the use of heat a double element of the thermal effect, so that the bimetallic bending, When the load current is 1.2 times or more of its preset value (usually the rated current of the protection obje ct), the heat generated by the hot and the double components causes the bimetallic component to flex and push the sliding plate to trip the thermal relay operating mechanism, and the power supply is cut off and protected Object to protection.

安装使用及维修 Installation and maintenance

安装使用

热继电器的整定电流调节范围应包容被保护对象的额定电流值。

热继电器整定电流调节旋钮不能随意旋转，使用时请按保护对象的电流值进行调节、整定，否则容易引起误动作。

选定组合安装时，先适当松动接触器主接线端子上的接线螺钉，把热继电器的挂钩部分插入接触器相庆的沟槽，再把热继电器的导电杆插入接触器的主接线端子内，坚固主动接线端子上的螺钉，即可完成组合安装。

选定分立安装，首先按5.1.3程序将热继电器固定在附件(底板)上，即可进行分立安装。

连接导线采用单芯聚氯乙烯(PVC)绝缘铜导线，辅助电路连接导线截面积1mm2，主电路连接导线载面积见表5，负载为电动机时的接线原理图见图5。

Installation and use

The setting range of the setting current of thermal relay should include the rated current value of the protected object.

Thermal relay setting current adjustment knob can not be freely rotated, please use the current value of the protection object to adjust, set, othe rwise easily lead to malfunction.

When the selected combination is installed, loosen the connection screw on the main contact of the contactor, insert the hook part of the thermal relay into the groove of the contactor, insert the conductive rod of the thermal relay into the main terminal of the contactor, Firmly screw the active terminals to complete the combined installation.

Selected discrete installation, first press the 5.1.3 program will be fixed in the thermal relay attachment (backplane), can be installed separately.

The connecting wire is made of single-core PVC insulated copper wire. The cross-sectional area of the auxiliary circuit connecting wire is 1mm2. The connection area of the main circuit connecting wire is shown in Table 5, and the wiring schematic diagram when the load is a motor is shown in Figure 5.