Contactor wiring and i hope after this post you will be able to wire a 3 phase motor i also published a post about 3 phase motor wiring with magnetic contactor and thermal overload relay but today post and contactor wiring diagram is too simple and easy to learn. It can be restarted only after the relay is reset.
L Amp T Motor Starter Handbook Pdf Free Download
L t overload relay connection diagram. These are available for various dol star delta combinations. The thermal overload relay can make up a compact starting solution together with contactors. In the below dol starter wiring diagram i shown a molded case circuit breaker a magnetic contactor normally open push button normally close push button switch thermal overload relay motor trip indicator and 3 phase motor. Its is important to. Lts range of contactors complements its range of thermal overload relays. Then connect the earth led wire to the motor body.
Then wire the overload relay with mc. Is video me ham thermal overload relay ke working principle construction or iske uses ke bare me janenge i hope ki ye video apko bahut pasand ayegi or is video se apko bahut kuch sikhne ko bhi. 2 days ago i wired 380 to 440 volts contactor for a 3 phase motor and save these images of contactor in pc. In the above three phase dol starter wiring diagram. However the cause of overload must be investigated before restarting or else the starter will trip again. Mcb db connection mcb diagram mcb dressing mcbox c doù parole mcbird d mcb electrical.
Then do connection between cb and mc. Back up fuse rating 2. Thermal overload relays are economic electromechanical protection devices for the main circuit. All connection i shown with complete guide. They offer reliable protection for motors in the event of overload or phase failure. You can follow same method as i shown in below contactor wiring diagram for wiring 3 phase motor with circuit breaker 3 pole motor stater and overload relay.
Fill up the following data of relay under test. Overload relay range selection chart lt overload relay reset button overload relay refrigerator. Lt switchgear esp service manual overload test 1m 1m dut 1m 1m from current source nc contact of relay connections of thermal overload relay for ol testing testing of thermal overload relay 1. Then do motor supply connection with overload relay. A relay type b relay range c max. 2 3 lt offers manual reset type thermal overload relays.
Persistent overloading can reduce the life of the motor. The relay trips the starter when there is an overload. They have a built in sensitive mechanism which protects the motor from overload and single phasing.
Gallery of L T Overload Relay Connection Diagram
