The APST support is foreseen to mount the enclosures ST.. on a standard DIN rail. The coupling between the support and the ST enclosures is snap-on type. The support itself is pre-punched for the wall-box type 502 (60 mm) or 503 (83.5 mm). By means of external bracketts, the APST can be wall-mounted. La base is provided with holes and mounting studs, compatible for a lot of enclosures. On the APST base it is possible to fasten up to 8 CLIP terminal blocks/connectors. A pre-punched round window (28 mm dia.) is foreseen for cabling conductors.