Security disconnecter with access port in a cover unit

摘要

The invention relates to a safety circuit breaker (100), in which one or more cover units (4) are placed on a lower part (1), which are located above mounting modules and cover them. According to the invention, the cover unit (4) is provided in its upper part (7) with a part of the surface of the upper part (7) engaging, closable opening (13) which is selectively open and close by means of a slider and in the open position, the fastening elements of a Mounting module for tool use makes accessible. By movement of the slide a measuring window within the cover unit (4) can be released.