What is the standard value of the circuit resistance of the VS1 vacuum circuit breaker?

In Timetric Electric’s VS1 vacuum circuit breaker, loop resistance is a key parameter used to evaluate the connection quality of the conductive loop. The value of the loop resistance is affected by many factors, mainly depending on the contact resistance between the dynamic and static contacts, which includes shrinkage resistance and surface resistance.

Shrinkage resistance is an increase in resistance due to a reduction in contact area due to the non-absolutely smooth and flat surface of the contact point. The surface resistance is caused by the presence of oxidation, sulfation and other films on the contact surface, which increases the resistance of the contact area. These factors lead to an increase in contact resistance, affecting the conductor's current-carrying capacity and short-circuit current-cutting ability.

The DC voltage drop method is usually used to measure the loop resistance of the VS1 vacuum circuit breaker in the closed state. It should be noted that different voltage levels and installation environments may affect the standard value of loop resistance. For example, outdoor and indoor standards may be different, and mechanical characteristics may also affect its standards. In Timetric Electric's products, the standard value of loop resistance is usually determined based on the rated current.

For example, under normal circumstances, for a VS1 vacuum circuit breaker with a rated current of 630A, the loop resistance should be less than or equal to 50 ohms; for a rated current of 1250A, the loop resistance should be less than or equal to 45 ohms; for a rated current of 1250A, the loop resistance should be less than or equal to 45 ohms; For rated currents of 1600 to 2000A, the loop resistance should be less than or equal to 35 ohms; for rated currents above 2500A, the loop resistance should be less than or equal to 25 ohms.

Therefore, when designing and producing VS1 vacuum circuit breakers, we must strictly control the loop resistance to ensure that it meets the specified standards within the rated current range to ensure the reliability and safety of the equipment.