How to select Eaton AC contactors

Create Date: 2024-8-30 12:03:23|Source: Eaton/Eaton

In addition to the rated working voltage and the rated working voltage of the controlled equipment, the load power, use category, control mode, operation frequency, working life, installation method, installation size and economy of the controlled equipment are the basis for selection. The selection principles are as follows:

1. The voltage level of the AC contactor should be the same as the load, and the type of contactor selected should be suitable for the load.

2. The calculated current of the load should conform to the capacity level of the contactor, that is, the calculated current is less than or equal to the rated working current of the contactor. The on-current of the contactor is greater than the starting current of the load, the breaking current is greater than the breaking current required when the load is running, the calculated current of the load should consider the actual working environment and working conditions, and the peak current of half an hour can not exceed the agreed heating current for the load with a long starting time.

3. Check the dynamic and thermal stability for a short time. The three-phase short-circuit current of the line should not exceed the allowable dynamic and thermal stability current of the contactor, and the breaking capacity of the contactor should also be verified when the contactor is used to disconnect the short-circuit current.

4. The rated voltage, current and the number and current capacity of the auxiliary contacts of the contactor suction coil should meet the requirements of the control loop wiring. Considering the length of the line connected to the contactor control loop, the generally recommended operating voltage value, the contactor should be able to work at 85-110% of the rated voltage value. If the line is too long, the contactor coil may not reflect the closing instruction due to the voltage drop is too large; Because the line capacitance is too large, it may not work for trip commands.

5. Check the allowable operation frequency of the contactor according to the number of operations. If the operating frequency exceeds the specified value, the rated current should be doubled.

6. The parameters of the short-circuit protection components should be selected in conjunction with the parameters of the contactor. When selecting, please refer to the sample manual, which generally gives the matching table of contactor and fuse.

7. The installation distance of the contactor and other components should conform to the relevant national standards and specifications, and the maintenance and wiring distance should be considered.

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