Easy removal of MCB, RCD or main incomer from an assembled unit, offering simple fitting of additional or replacement components without removal of the busbar.

微型断路器、漏电断路器及主开关可于组件上轻易拆除，提供简便的更换装配而不需拆除母线。

youdao

This reduces the cost and complexity from future upgrades because module replacement, upgrades, and populating empty slots incurs no additional cost or extra service contracts-it is already covered.

由于模组更换，升级和填充空的插槽不会带来额外的成本或额外的服务合同-因为已经包括了，因此这就降低了未来升级的成本和复杂性。

youdao

That functionality also exists in the PS3 -- Flash memory via USB or a full-on internal HDD replacement -- but Koller says consumers are more inclined to purchase additional consoles rather than replacing internal storage.

ENGADGET: Sony explains missing PlayStation 3 price drop on old models, EU exclusivity of Flash memory version