The installation boxes are equipped with elements for attaching electrical devices, e.g. using a DIN rail or another method. The S-boxes contain 3 sets of mounting holes (located outside the protected area or inside the box), which allow the S-Boxes to be attached in up to three possible ways to a wall or a base. The lid is attached with metal screws with a combination head with a zinc finish. When the three screws are unscrewed, the lid can be left hanging on the box, which facilitates and speeds up assembly and maintenance.