LRD3C thermal overload relay

LRD3C thermal overload relay - Zhejiang Zhuoliang Electric Co., Ltd. specializes in selling Schneider thermal overload relay series, for consultation.

Company Name: Zhejiang Zhuoliang Electric Co., Ltd
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The action time of a thermal relay varies in inverse time relationship with the magnitude of the overload current. As a thermal relay for motor overload protection, it is necessary to ensure that the normal starting and operation of the motor are not affected, and to maximize the carrying capacity of the motor. Therefore, the action characteristic curve of the thermal relay should be located below and close to the allowable heating characteristic curve of the motor.

There is a current regulating cam used to adjust the set current. There is a temperature compensation device to ensure that the operating characteristics remain basically unchanged within the surrounding medium temperature range of -20C to 60C. There is a reset adjustment knob to adjust the reset mode, which has two reset states: manual and automatic. There is a stretching spring flipping and jumping mechanism to ensure rapid and reliable contact movement. There is a differential phase failure/three-phase unbalance protection device. There is a detection slider/switch position indicator that simulates the tripping of a thermal relay and displays the action status. Check and ensure the correct wiring of the auxiliary circuit through this simulation method. When the marking on the slider is located at the "0" mark, it displays a trip, and at the "l" mark, it displays a work. There is a disconnect button. When the disconnect button is pressed, the normally closed contact opens the series contactor, disconnecting the load. After releasing the disconnect button, the load resumes operation through the contactor. Overload relays can only serve as overload protection for controlling motors and cannot serve as short-circuit protection. When installing, it is necessary to understand the rated current of the protected object, and the selected specifications must be+20% of the rated current. Usually installed directly after the starting contactor (Magnetic Switch) of the electric motor. When the current is too high or the load current exceeds the set value, the overload relay will be activated and the circuit will be disconnected. Although the circuit can be restored by resetting the button, if the overload relay of the device is activated, the set current cannot be arbitrarily increased. The cause of the overload should be investigated, otherwise it is very easy to burn out the protected device.