How about the vacuum circuit breaker of Jiangsu Senyuan Electric Co., Ltd.?

I heard that they specialize in making circuit breakers, and the quality is ok. Our company has used them for five or six years, and there has been no problem. I feel good about changing the closing coil upstairs. In their VJ 12 model, the closing coil is placed on the operating mechanism alone, without the influence of other components. Five or six years later, the important parts have not rusted yet, and the workmanship is still good.