DCU37PAAF202

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DCU37PAAF202 is a heavy-duty thermal overload relay designed to protect electrical motors from damaging overload currents. It is a type of industrial fixture which is typically used to prevent a motor from burning out due to overloads or short-circuit protection. This type of thermal overload relay is designed to open the circuit when the motor current exceeds a set or predetermined value. It is available in various sizes and formats to meet different application needs.

The DCU37PAAF202 application field is mainly for the measurement and protection of the overload current of low-voltage three-phase motors. It is designed to be used in factory automation, pump stations, and other industrial motor applications. This relay has good protection features in terms of over-current protection, reversing phase sequence protection, and short-circuit protection. It is also suitable for use in applications requiring long-term reliable operation.

The working principle of DCU37PAAF202 is based on heat sensing technology. It uses a thermal element disk which is shaped like a coil and measures temperature changes. This affects its electrical properties to alter the amount of current flow through the relay. When motor currents exceed a set point, the disk heats up and its electrical properties change to open the relay contact. This action cuts off the power to the motor, thus protecting it from damage due to overload or short-circuit.

The thermal element disk has two electrical properties, namely, the coefficient of thermal expansion (CTE) and the resistivity. The CTE is the measure of the extent to which a material expands or contracts when exposed to heat. The resistivity is the measure of the resistance of the material to the flow of electrical current. These two properties have a direct effect on the temperature and the current flow, and thus, they affect the working principle of the relay.

The thermistor fitted to the thermal element disk is used to detect temperature changes. This thermistor is designed to increase its resistance when exposed to high temperatures. When the motor current exceeds the predetermine value, the disk heats up and this in turn causes the thermistor to increase its resistance, which opens the relay contact and cuts off the power to the motor.

In summary, the DCU37PAAF202 thermal overload relay is designed to protect electrical motors from overload currents and damage. It is based on a thermal element disk which alters its electrical properties when exposed to heat, and it uses a thermistor to detect temperature changes. This device has good protection features and is suitable for industrial motor applications requiring long-term reliable operation.

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