Figure below shows a typical thermal overload relay. From cold start from hot start trip time seconds multiples of current setting 1. Bimetallic thermal relay as their name implies, bimetallic thermal relay use a bimetallic strip to mechanically open the contacts. Overload relay 7 technical data 7 dimensions 8 freedom series contactors and overload relays contactors 10 accessories 11 thermal overload relays 14 type 2 coordination selection procedure 16 technical data 18 dimensions 33 modular series contactors and overload relays contactors 38 accessories 40 technical data 42 dimensions 47 thermal. Once tripped, the thermal overload relay will not reset until it has cooled, automatically allowing the motor to cool before it can be restarted.
An adjustment dial located on the unit allows the ampere trip setting. Siemens 3ru11 364eb0 thermal overload relay, for mounting onto contactor, size s2, 2232a setting range by siemens in stock. The basic working principle of thermal relay is that, when a bimetallic strip is heated up by a heating coil carrying over current of the system, it bends and makes normally open contacts. It offers overload protection only, so must be coupled with an upstream magnetic circuit breaker for short circuit protection. Thermal overload relays with trip class 20 table for tripping time thermal overload relays ta25du trip class 20 1. A thermal overload relay is a small electromechanical device that protects motors from overheating. Electronic overload relays class 10, 20, 30 trip class 10, 20, 30 selectable accessories electronic overload relays setting range trip class type order code.
The heat produced by the overload current is utilized to trip the motor circuit. Thermal overload relays overview farnell element14. Sirius 3ru thermal overload relays sirius 3rb electronic overload relays manual, 122017, a5e03656507420arsac004 9 introduction 1 1. Thermal overload relay ta75du trip class 20 18 25 100 160 80 80 5. Thermal overload relays, class 10a for more information technical specification page 121156 drawings page 173 contactors page 26 starters page 49 separate mounting unit page 169 electronic overload relay page 98 operating curves page 151 description direct mount on the gm9, 12, 18, 22 contactors 9, 12, 18, 22a frames. Thermal overload relays and motor protection circuit breakers. Ba33a type b block overload relay, 3p amb comp for start. Ambient temperature is the temperature surrounding the overload relay enclosure. Abb library accessories for thermal overload relays.
Overload relay should install in our motor starter application for extra protection. In order to protect motors against shortcircuits, it is advisable to use fuses am in conjunction with the thermal overload relay. Hi friends, in this article, i am talking about thermal overload relay working principle and its function in a dol starter. Thermal overload relays for contactors filtered by type. Data according to iec 94741, iec 94751, vde 0660, en 6094741, en 6094751. C for a thermal overload relay in an ambient temperature higher or lower than the motor 40c 104f, the overload trip current can be calculated by applying a correction factor from the curve in figure 1. Fuse a catalog number list price multiplier symbol. Lr9d69 tesys lrd electronic thermal overload relay 90. These relays help to control the electrical current that goes to the motor to prevent it from overheating.
A thermal overload relay, commonly called a thermal overload, is a device which is usually connected directly to a motor contactor. A thermal overload relay works on the heat produced by the excessive overload current. Request document 252oct9501r697 enclosed iec starters dline starters and integral selfprotected starters are available. W lst thermal overload relays location of terminals w lstd with lszdte01 w lst0, lst2. Rw thermal overload relays in contactor assemblies for wyedelta starters. Control and chapterb11 tesys p c rotection omponents from. Can tesys lr97d or tesys lt47 be used with external cts. The ta80du80 thermal overload relay is an economic electromechanical protection device for the main circuit. Weg rwm420e3a4u250 50250a thermal overload relay for cwm contactors. This page contains technical data sheet, documents library and links to offering related to.
Basically thermal overload relay is an overcurrent protection of the simplest type. Thermal overload relays motor protection for overload and phase failure thermal overload relays are economic electromechanical protection devices for the main circuit. The bimetallic strips, heating coils and the current transformers are the important parts of the thermal relay. Types of motor overload relay electrical engineering centre. Thermal overload relays type ic5882d 0, 1 short ic5882d121a long ic5882d121b 2 short ic5882d122a long ic5882d122b 3 short ic5882d123a long ic5882d123b 4, 5, 6 size 4. Nr2 thermal overload relay n r 2 current class design sequence no. Thermal overload relays,electronic thermal overload relays. Thermal overload relay working principle your electrical guide.
Thermal overload relays class 10 a for use with tesys d contactors. Lr9f5567 tesys lrf electronic thermal overload relay 60. Thermal overload relays are economic electromechanical protection devices for the main circuit. The motor current flows through their bimetals 1 per phase which are indirectly heated. Thermal overload relays 3pole contactors and overload. Thermal overload is widely used for motor protection. Overload relay can avoid serious damage for electric. Thermal relay working principle construction of thermal. Overload relays 8 ambient temperature other than 40. Thermal overload relays for use with tesys k contactors. Frame type of magnetic starters separate mounting type certificate no.
Bimetallic thermal relay as their name implies, bimetallic thermal relay use. Thermal overload relays 3pole contactors and overload relays for. The working principle of thermal overload relay is quite simple but interesting. It offers reliable and fast protection for motors in the event of overload or phase failure. The relays are ambient temperature compensated, and the unique double slide mechanism provides reliable protection against single phasing.
The thermal relay works on the principle of the thermal effect of electrical energy. The overload relay must be used in conjunction with a contactor. They offer reliable protection for motors in the event of overload or phase failure. Abb library is a web tool for searching for documents related to abb products and services. Ba33a eaton type b block overload relay, 3p amb comp for start. Thermal overload relay are conversely designed to measure a motors heating profile. Telemecanique integral selfprotected starters combine. Selfsupplying electronics avoids need for connection of an external supply voltage. Under the effect of the heating, the bimetals bend, cause the relay to trip and the position of the auxiliary contacts to change. If the motor pulls too much electricity for an extended period of time, the relay may flip and cut the power to the motor to prevent damage. Please keep image files under 1mb in size and pdf files under 5mb in size.
Weg rw27d 2232a thermal overload relay for cwm contactors. The specifications in relation to shortcircuit protection for contactors and overload relays. A motor overload relay is an electromechanical relay that is operated by heat developed in the relay. Construction and working of thermal relay circuit globe. Mn 12l relays with trip class 30 are specially designed for long starting time applications. The overload relay z can be mounted directly on contactor dil m up to 250 a. Siemens industry catalog automation technology industrial controls protection equipment overload relays sirius 3ru2 thermal overload relays. Thermal overload relays type ta thermal class 10 elays class. The thermal type of overload relay is designed to unless called for in the manufacturers instructions or open a circuit when excessive current causes the heater. Cts can be chosen from the ct offer in the powerlogic catalogue check attached file. Abb overload relays thermal overload relays product.
Technical catalogue thermal overload relays electronic. When the level of current in a circuit reaches a preset value, the increased temperature opens a set of contacts. Product selection accessories din rail and panel mounting adapter these adapters are required when. Sep 01, 2018 a thermal relay works depending upon the above mentioned property of metals. Sirius 3ru2 thermal overload relays industry mall siemens ww. The overload relay has no power contacts and cannot disconnect the motor by itself. Reduced number of variants reduces inventory costs and.
Mitsubishi thermal overload relay, motor protection relay, thn12cxkpul. Thermal overload relays weg rw series dimensional diagramsmounting without contactor operating positions rw17d, rw27d, rw67d, rw117d, rw317d, rw407d rw17d with cwc series rw27d, rw67d, rw117d, rw317d, rw407d with cwmcwme series mounting position the relay must be mounted on an stable and vibration free surface. These thermal overload relays conform to the iec standard, and provide perfect motor protection. Abb data sheet thermal overload relay tf42 5 auxiliary circuit terminal marking 9596, 9798 rated operational voltage ue 600 v conventional free air thermal current ith n. Rw series threepole thermal overload relay class 10 matching contactor setting range a max. They can be used as standalone manual starters or to protect each branch circuit of a group motor installation. China suntree electirc productions electronic thermal overload relays and other products with leading technical level in this field. The thermal overload relay can make up a compact starting solution together with contactors. Tesys d differential thermal overload relays class 10, 10a or 20 for. Thermal overload relays type ta thermal class 10 elays. I hope you will find this article informative and helpful.610 1247 1055 159 843 84 898 451 836 510 1429 1184 685 759 458 1124 1106 1072 526 302 1121 107 1343 1427 401 944 951 1031 659 1402 1186 1133 521 1418