Leakage knowledge:

What is the difference in leakage between model C and model D?

The leakage protection of models C and D are both devices used to protect circuits from leakage current damage, but they have some differences in triggering current and triggering time.

1. Trigger current: The trigger current range of leakage protection for model C is relatively large, usually 5-10 times the rated current. The triggering current range of leakage protection for model D is relatively small, usually 2-5 times the rated current. This means that the leakage protection of model D can also trigger a circuit breaker in a timely manner for smaller leakage currents, providing better protection.

2. Trigger time: The trigger time for the leakage protection of model C is relatively long, usually between 0.1 seconds and 0.2 seconds. The triggering time for the leakage protection of model D is relatively short, usually between 0.04 seconds and 0.1 seconds. This means that the leakage protection of model D can disconnect the circuit faster, reducing the damage caused by leakage.

In summary, the leakage protection of model C is suitable for places that are more tolerant of equipment failures, while the leakage protection of model D is suitable for places that are more sensitive to equipment failures, such as medical equipment and computer equipment. The specific choice of leakage protection model should be determined based on actual needs and the requirements of the location.

What kind of leakage protection is suitable for frequency converters?

For frequency converters, it is recommended to choose the leakage protection of model D.

Because the frequency converter generates some special current waveforms during operation, these special current waveforms may cause traditional model C leakage protection false triggering and false disconnection. The leakage protection of model D has higher sensitivity and better adaptability, which can more accurately determine the changing current generated by the inverter during operation and trigger the circuit breaker protection in a timely manner.

In addition, during the operation of the frequency converter, due to its speed regulation principle and electromagnetic interference factors, greater electromagnetic interference and harmonics may be generated, which may affect the triggering of leakage protection and the stability of operation. And the leakage protection of model D takes these factors into consideration in its design, with better anti-interference ability and more stable operation.

In summary, in order to ensure the stability and safety of the frequency converter, it is recommended to use the leakage protection of model D for protection. Of course, the specific selection should be comprehensively considered based on factors such as actual frequency converter parameters, working environment, and safety requirements.

What are the common uses of leakage protection for model C?

The leakage protection of model C is mostly used in ordinary households and general industrial places, as well as equipment and circuits that are insensitive to current changes. Here are some common application aspects:

1. Residential and commercial electricity: The leakage protection of model C is applicable to general electricity protection in residential and commercial buildings, such as household electricity, offices, shops, restaurants, small factories, etc.

2. Lighting circuit: In lighting circuits, the requirements for leakage current are generally low, and the leakage protection of model C can meet the protection needs of ordinary lighting circuits.

3. General household appliances: For general household appliances such as refrigerators, televisions, washing machines, rice cookers, etc., Model C's leakage protection can provide basic overcurrent and leakage protection.

4. General industrial equipment: For general industrial equipment such as motors, pump stations, fans, etc., and with low requirements for leakage current changes, Model C leakage protection can provide basic overcurrent and leakage protection.

It should be noted that for some devices and circuits that are sensitive to current changes, such as medical equipment, computer equipment, frequency converters, etc., it is recommended to choose the more sensitive model D leakage protection for protection to ensure higher safety and working stability.