Can any electrician tell, how the settings in thermal overload relays are done?

Question

There is a white tuner, one orange, one small red pin like. What are these?

Answer 1

There is a cross head Philips plastic s***w on it and a scale showing the current ranges that can be adjusted.On this s***w there is an arrow shoving the scale turn the s***w with a s***w driver up tu the current ( which is written on the motors plate as nominal current) which has to be.There is also a red plastic indicator ( plastic piece ) which shows that the thermal relay is tripped if it is out from the surface of the relay.If it is in at the surface level it is not tripped.There is an other plastic indicator which is generally blue do not touch it because it is for locking the relay if somehow the motor is overloaded the thermal relay will not protect the motor.If you are not experienced I will advise you to leave that piece out from the surface of the relay.

Answer 2

what would be nice to know is the make and model of the overload relay you have in order to answer your question it can be done in many ways your description is not the best to give you an accurate answer. sorry need more details.

Answer 3

Usually a thermal overload has a control to set the current. This will have a range and should be set to the full load current of the motor it is being used on (IEC type). In the NEMA type you need to add the service factor.

There will be some form of reset button. There may be a test button. Some overloads may have a selector to choose the class (10%, 20%, 30%). This is set depending on the motor load. A fan that requires a load start current may be set at 30%. A conveyor may be OK at 10%.

Obviously different manufacturers may color these buttons differently so I cannot say what you have.