Overload Relay Auto Reset

How to reset the overload relay in a control panel by engineer m anis 14 august 2017.

Overload relay auto reset.

Automatic reset thermal overload relays. With the manual auto reset selection button we can choose between manual and automatic reset of these relays after a trip. The overload relay will sense the increased current from the heat and will trip to protect the motor. View datasheet thermal overload relays t16 from abb electrification products.

Manual reset test or auto automatic reset test it is possible to simulate the test and the trip functions by pressing the reset button. Also the overload relay itself could fail. The t16 thermal overload relays are economic electromechanical protection devices for the main circuit. Visible trip indication and test function standard on all c3controls series 320 overload relays.

The sensing device of a bimetal strip made of two metals. If the device is set to auto a remote reset of olr is possible. An adjustable overload relay could be improperly set up causing it to trip with a normal surge or temporary overload. In the case of motors that are automatically controlled the overload relay may be set to hand or auto reset as the situation requires.

Manual or automatic reset and test modes and stop button all in a single device. A manual reset is used for machines that people can enter and for emergency stop circuits and an auto reset is used for machines that people cannot enter. Thermal trip class 10 overload protection trips within 10 seconds when carrying a current of 720. Resets must occur only after all hazards have been cleared and a manual reset is basically safer.

When set in the h or hand position the reset button must be pressed manually to reset the overload relay after a tripping event. The motor will stop if the overload relay trips out and will not restart automatically regardless of the position of any control switch until the overload relay is reset. If the. On the overload relays that i was looking at it has a reset button that must be manually reset but the motor will start immediately when the reset is pressed is this automatically starting not acceptable unless the monitor the extra auxiliary contact is used to stop the motor control relay contactor by control the relay or monitoring.