The protection device of the motor can act when the motor is overloaded or overheated, and disconnect the circuit. The protector of the constant temperature and humidity test chamber has bimetallic overcurrent protector, mercury type overcurrent relay and so on. ★. The shape of the bimetallic overheat and overcurrent protector is a dish, it tightly pressed on the shell of the compressor can feel the temperature of the shell of the compressor and the current overload of the motor. When the compressor is overheated for some reason or due to overload and the current is too large, the bimetallic sheet will be deformed due to heat, then drive the contact to jump open, timely cut off the circuit of the compressor motor, play the role of protecting the compressor. Under normal circumstances, the contact of the electric heating wire and the bimetallic sheet in the protector is closed. ★. The bimetallic sheet and electric heating wire connected in series circuit, the electric heating wire is close to the bottom of the double piece, when the current through is too large, the heat also increases, the bimetallic sheet after heating up bending circuit cut off. ★ Overcurrent relay is also a bimetal structure. When the motor is overloaded, the double whole piece is bent due to overheating, and the press plate is reported, so that the fast moving mechanism will move, and the contact will cut off the electromagnetic coil circuit of the electromagnetic contactor, so that the electromagnetic contactor is opened. The device has a manual adjustment button to adjust the current (which has been adjusted before leaving the factory).
