Why does the circuit breaker trip when the water pump is overloaded?

There are many reasons for this phenomenon. Generally speaking, it can be checked from two aspects of electrical failure and mechanical failure.

Mechanical Failure

First of all, for mechanical reasons, it is more likely that the bearing is short of oil and the impeller is stuck by foreign matter. When the bearing is short of oil or the impeller is stuck by foreign objects (such as ropes, stones, etc.), the motor load is too heavy and the current rises. The circuit breaker may trip.

Secondly, it is also possible that the submersible pump is not completely covered by water because the water is too shallow. If the submersible pump is not covered by water, it will not get good heat dissipation, the temperature of the motor will rise, and it may also cause a trip.

Electrical Failure

1. The circuit breaker is too small

If the rated current of the circuit breaker is too small, when the water pump runs for a period of time, the circuit breaker switch will trip due to overload. When selecting a circuit breaker, it must be ensured that the rated current of the circuit breaker is greater than the actual current of the pump, and a high-quality and reliable circuit breaker should be selected, with more reasonable configuration and more reliable quality.

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2. The power cord is too long

If the power line is too long and the line resistance is large, there will be more voltage drop. That is, although the voltage at the switch terminal is normal, the voltage to the submersible pump is not enough. If the motor voltage is insufficient, the current will rise, which will also cause tripping.

3. Capacitor capacity is not enough

If it is a water pump that was used normally before, and it trips after a period of time, it may be that the capacitance of the water pump is too small. Small capacitor capacity will cause the phase between the primary and secondary windings of the motor to change, and the rotational force and speed of the motor will decrease, resulting in insufficient power and increased current.

4. Turn-to-turn short circuit

When the insulation of the motor coil is damaged, it may cause a short circuit between turns (a part of the coil is shorted). A turn-to-turn short circuit shortens the effective length of the coil, lowers the impedance, and increases the current, which trips the circuit breaker.

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