How do you select a non-branded vacuum circuit breaker? - Blog

When selecting a non-branded vacuum circuit breaker-which lacks official brand endorsement-it is essential to conduct a rigorous evaluation based on factors such as technical parameters, structural type, and the purchasing process. The key lies in choosing the appropriate model and specifications based on the specific application scenario and electrical requirements, ensuring that the device meets operational standards for stability and safety.

1. Determine basic technical parameters

This is the foundation for selecting any circuit breaker; you must ensure the chosen equipment can withstand both normal circuit operating conditions and fault conditions.

Selection by voltage: The circuit breaker's rated voltage should not be lower than the system's nominal voltage for the circuit, and its maximum permissible operating voltage should be greater than or equal to the circuit's maximum operating voltage.

Selection by current: The circuit breaker's rated current (In) must be greater than or equal to the circuit's continuous operating current (Ig) under various operating modes.

Selection based on operating conditions:

Ambient temperature: Consider the temperature range of the equipment's operating environment.

Stability verification: Verify the circuit breaker's stability based on operational requirements.

2. Select the structure based on the switchgear type

The type of switchgear directly determines which circuit breaker models can be used.

Indoor fixed-type 10kV switchgear: The ZN28 model vacuum switch can be used; it is typically equipped with a spring operating mechanism and supports AC/DC electric as well as manual operation.

Indoor withdrawable-type 10kV switchgear (e.g., KYN type): The VS1 model vacuum switch can be used; it is typically equipped with an integrated spring operating mechanism and also supports AC/DC electric and manual operation.

3. Follow a prudent purchasing process

Taking cautious measures during the purchasing stage can effectively mitigate risks.

Functional testing: Upon delivery, test each major function of the circuit breaker and perform a brief trial run to ensure it is in good working order.

Verify information: Carefully check the model information on the invoice to avoid purchasing the wrong item due to similarities in model numbers despite significant price differences. For high-value or bulk purchases, the accuracy of invoice information is crucial for future maintenance or returns. Clarify after-sales terms: Before purchasing, be sure to ask the supplier for clear details regarding the product's warranty policy, warranty period, and the procedure for handling issues.